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Title: Zero Energy Lab AND Designing the IPRO Team Collaboratory Space (sequence unknown), IPRO 337 - Project Plan: IPRO 337 Project Plan F09
Creator: Akutagawa, Abraham, Babnigg, David, Chiu, Mark, Dosky, Benton, Hansen, Kai, Kawa, Konrad, Mensah, Teddy, Park, Lillian, Parkes, Brian, Patel, Jay, Reinecke, Jonathan, Shive, Clayton, Vice, Evan, Zappala, Theresa
Date: 2009-12
Description: The goal of this IPRO is to continue the research and application of previous research into ‘Zero Energy’ techniques, while simultaneously...
Show moreThe goal of this IPRO is to continue the research and application of previous research into ‘Zero Energy’ techniques, while simultaneously evaluating an old CTA building on the IIT campus for its feasibility both as a collaboratory IPRO space and as a ‘Zero Energy’ building.
Project plan for IPRO 337: Zero Energy Lab AND Designing the IPRO Team Collaboratory Space for the fall 2009 semester.
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Title: Flow characteristics of a rectangular multielement supersonic mixer-ejector
Creator: Taghavi, R, Raman, G
Date: 1996-04
Publisher: SPRINGER VERLAG
Description: This study describes a technique that combines the benefits of focusing schlieren and phase conditioning. Focusing schlieren blurs and drops...
Show moreThis study describes a technique that combines the benefits of focusing schlieren and phase conditioning. Focusing schlieren blurs and drops contrast of non-critical features whereas phase conditioning emphasizes periodic flow features, and their combination produces unique results. The supersonic jets that we studied produced an intense tone referred to as screech. The measured screech tone signal was used as input to the phase conditioning circuit that adjusted the strobing light source to the vertical synchronization pulse of a CCD camera. The sharp video images obtained by this technique could either be frozen or continuously swept through one period of screech to acquire a slow motion video record of the jet unsteadiness. Two cases were visualized in this study: first, an underexpanded jet from a convergent rectangular nozzle at various fully expanded Mach numbers. Second, a supersonic jet emerging from a convergent-divergent rectangular nozzle at a design Mach number of 1.4, artificially excited by impingement tones. The results of this study illustrate the usefulness of this system in visualizing oscillatory flows.
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Title: Parton distributions and event generators, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Carrazza, Stefano, Forte, Stefano, Rojo, Juan
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: We present the implementation within the Pythia8 event generator of a set of parton distributions based on NNPDF methodology. We construct a...
Show moreWe present the implementation within the Pythia8 event generator of a set of parton distributions based on NNPDF methodology. We construct a set of leading-order parton distributions with QED corrections, NNPDF2.3QED LO set, based on the same data as the previous NNPDF2.3 NLO and NNLO PDF sets. We compare this PDF set to its higher-order counterparts, we discuss its implementation as an internal set in Pythia8, and we use it to study some of the phenomenological implications of photon-initiated contributions for dilepton production at hadron colliders.
Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
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Title: Library ReDefinition: LibraryRedefinitionPresentation
Creator: Avery, Brian
Date: 2011, 2011-05
Description: The Alcuin Library was designed in the 1960's by Marcel Breuer when the purpose of a library was to provide storage of, and access to,...
Show moreThe Alcuin Library was designed in the 1960's by Marcel Breuer when the purpose of a library was to provide storage of, and access to, information. This project is an addition and renovation of the existing academic library into a campus center concentrated on learning information.
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Title: Teacher Knowledge Share (Semester Unknown) IPRO 320: Teacher Knowledge Share IPRO 320 Poster2 F08
Creator: Bern, David, Bochantin, Marike, Hartline, Julian, Mccall, Ian, Mick, Emily, Peake, Andrew, Pierce, Alison, Pindrik, Dmitriy, Quinn, Michael, Stanford, Carly, Tilatti, Michael
Date: 2008, 2008-12
Description: The goal of IPRO 320 is to create an online professional network for school teachers at the kindergarten through twelfth grade level to allow...
Show moreThe goal of IPRO 320 is to create an online professional network for school teachers at the kindergarten through twelfth grade level to allow for the sharing of ideas, lesson plans and other professionally relevant information. This is a continuing project which saw limited success in the previous semester in that a functioning web site was constructed based on surveys of public school teachers but it saw very little use. This semester, the planned approach is to build on the research generated last semester by performing additional market research with teachers. Following that, IPRO 320 will rework much of the previous web site by refining some of the features, adding additional ones as the research indicates and improving the website in general, both functionally and aesthetically.
Deliverables
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Title: Developing Web Applications for the Northern Illinois Hockey League (sequence unknown), IPRO 308 - Deliverables: IPRO 308 Abstract F09
Creator: Lucchesi, Kristin, Barksdale, Dustin, Hays, Julian, Bartus, Kryzystof, Perkins, William, Savage, Christopher, Scheer, Colin, Semenov, Vladimir, Vidutis, Mantas
Date: 2009-12
Description: The NIHL is the largest hockey league in Illinois. It is also the largest youth all star hockey league in the US, serving over 300 youth teams...
Show moreThe NIHL is the largest hockey league in Illinois. It is also the largest youth all star hockey league in the US, serving over 300 youth teams and over 4,000 players. The team's purpose is to make the NIHL a web-based scheduling and scoring applications that can support their annual operations.
Sponsorship: Northern Illinois Hockey League(NIHL)
Deliverables for IPRO 308: Developing Web Applications for the Northern Illinois Hockey League for the fall 2009 semester
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Title: KILOMETER-SPACED GNSS ARRAY FOR IONOSPHERIC IRREGULARITY MONITORING
Creator: Su, Yang
Date: 2017, 2017-05
Description: This dissertation presents automated, systematic data collection, processing, and analysis methods for studying the spatial-temporal...
Show moreThis dissertation presents automated, systematic data collection, processing, and analysis methods for studying the spatial-temporal properties of Global Navigation Satellite Systems (GNSS) scintillations produced by ionospheric irregularities at high latitudes using a closely spaced multi-receiver array deployed in the northern auroral zone. The main contributions include 1) automated scintillation monitoring, 2) estimation of drift and anisotropy of the irregularities, 3) error analysis of the drift estimates, and 4) multi-instrument study of the ionosphere. A radiowave propagating through the ionosphere, consisting of ionized plasma, may su↵er from rapid signal amplitude and/or phase fluctuations known as scintillation. Caused by non-uniform structures in the ionosphere, intense scintillation can lead to GNSS navigation and high-frequency (HF) communication failures. With specialized GNSS receivers, scintillation can be studied to better understand the structure and dynamics of the ionospheric irregularities, which can be parameterized by altitude, drift motion, anisotropy of the shape, horizontal spatial extent and their time evolution. To study the structuring and motion of ionospheric irregularities at the sub-kilometer scale sizes that produce L-band scintillations, a closely-spaced GNSS array has been established in the auroral zone at Poker Flat Research Range, Alaska to investigate high latitude scintillation and irregularities. Routinely collecting lowrate scintillation statistics, the array database also provides 100 Hz power and phase data for each channel at L1/L2C frequency. In this work, a survey of seasonal and hourly dependence of L1 scintillation events over the course of a year is discussed. To efficiently and systematically study scintillation events, an automated low-rate scintillation detection routine is established and performed for each day by screening the phase scintillation index. The spaced-receiver technique is applied to cross-correlated phase and power measurements from GNSS receivers. Results of horizontal drift velocities and anisotropy ellipses derived from the parameters are shown for several detected events. Results show the possibility of routinely quantifying ionospheric irregularities by drifts and anisotropy. Error analysis on estimated properties is performed to further evaluate the estimation quality. Uncertainties are quantified by ensemble simulation of noise on the phase signals carried through to the observations of the spaced-receiver linear system. These covariances are then propagated through to uncertainties on drifts. A case study of a single scintillating satellite observed by the array is used to demonstrate the uncertainty estimation process. The distributed array is used in coordination with other measuring techniques such as incoherent scatter radar and optical all-sky imagers. These scintillations are correlated with auroral activity, based on all-sky camera images. Measurements and uncertainty estimates made over a 30-minute period are made and compared to a collocated incoherent scatter radar, and show good agreement in horizontal drift speed and direction during periods of scintillation for cases when the characteristic velocity is less than the drift velocity. The methods demonstrated are extensible to other zones and other GNSS arrays of varying size, number, ground distribution, and transmitter frequency.
Ph.D. in Mechanical and Aerospace Engineeering, May 2017
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Title: AN OVERVIEW OF IMPROVED PROBABILISTIC METHODS FOR STRUCTURAL REDUNDANCY ASSESSMENT OF INDETERMINATE TRUSSES
Creator: Pathe, Julien Rene
Date: 2012-07-25, 2012-07
Description: The redundancy of a structure refers to the extent of strength that is not considered in design. For an indeterminate structure a member...
Show moreThe redundancy of a structure refers to the extent of strength that is not considered in design. For an indeterminate structure a member failure does not necessarily induces the loss of integrity or functionality of the structure; rather it will affect its potential for safely carrying any future load. Numerous methods have been introduced in structural reliability literature to measure and implement the redundancy in design. However, in accordance with the semi-probabilistic approach of the codes which aim to develop design method providing consistent level of redundancy within the structure, the probability of failure of the structure has been proposed and is widely used as a redundancy measure. A classical method to compute the probability of failure of the structure based on failure paths is presented as a reference in this thesis. However, although extensively used, this method has major shortcomings which may lead to a misrepresentation of the structure redundancy. By using a geometric representation of members’ limit states associated with a loading regime, the research presented herein proposes an improved method for structural redundancy estimation that may be helpful to overcome problems associated with approximations and inconsistencies inherent in classics methods. Specific assumptions and/or procedures considered in the proposed method are described below. (1) An approximation is given to make the events of member failures mutually exclusive. (2) Geometric calculations are used to determine reliability indices and conditional reliability indices in order to establish closer bounds for the failure probability of individual structural members. (3) System’s failure probability is obtained using the assumption and procedures outlined in (1) and (2) above. (4) To further extend the method beyond geometrical redundancy, and to consider material redundancy, plasticity models commonly used in the structural analyses are considered in this study
M.S. in Civil Engineering, July 2012
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Title: Intelligent process monitoring by interfacing knowledge-based systems and multivariate statistical monitoring
Creator: Norvilas, A., Negiz, A., Decicco, J., Cinar, A.
Date: 2000-08
Publisher: ELSEVIER SCI LTD
Description: An intelligent process monitoring and fault diagnosis environment has been developed by interfacing multivariate statistical process...
Show moreAn intelligent process monitoring and fault diagnosis environment has been developed by interfacing multivariate statistical process monitoring (MSPM) techniques and knowledge-based systems (KBS) for monitoring multivariable process operation. The real-time KBS developed in G2 is used with multivariate SPM methods based on canonical variate stare space (CVSS) process models. Fault detection is based on T-2 charts of state variables. Contribution plots in G2 are used for determining the process variables that have contributed to the out-of-control signal indicated by large T-2 values, and G2 Diagnostic Assistant (GDA) is used to diagnose the source causes of abnormal process behavior. The MSPM modules developed in Matlab are linked with G2. This intelligent monitoring and diagnosis system can be used to monitor multivariable processes with autocorrelated, cross-correlated, and collinear data. The structure of the integrated system is described and its performance is illustrated by simulation studies.
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Title: Innovative Mapping (sequence unknown), IPRO 303 - Deliverables: IPRO 303 Ethics Report F09
Creator: Komoroski, Aaron, Mora, Andres, Sarraf, Basel, Kemp, Brandon, Duong, Cindy, Woodward, Frank, Suwada, Jerry, Michael, Mark, Sinha, Piyush, Glover, Richard, Mandrekar, Urba
Date: 2009-12
Description: The team worked to target the majority of mobile device users and give them an outlet to report any changes, mistakes or developments that...
Show moreThe team worked to target the majority of mobile device users and give them an outlet to report any changes, mistakes or developments that have been overlooked by NAVTEQ in the company's mobile mapping solutions. The team also worked to develop a solution that enables the average map user – men and women ages 18-35, students and tourists – to address these alterations in a simple, hassle-free way.
Sponsorship: NAVTEQ
Deliverables for IPRO 303: Innovative Mapping for the fall 2009 semester.
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Title: artiFACT: Art & Cinema Center, Rethinking of Contextuality through Boundaries: M. Enis Aldallal - Master Project - Spring11
Creator: Aldallal, Mohamed Enis
Date: 5/3/2011, 2011-05
Description: Boundary: Sight and Access: Breaking the programmatic elements into fragments allows responding to different contextual forces. Engaging those...
Show moreBoundary: Sight and Access: Breaking the programmatic elements into fragments allows responding to different contextual forces. Engaging those forces to create a site-specific design can be achieved by means of porous skin and a dynamic circulation pattern that occupies boundary spaces throughout the site. This provides smoother transition moments between inside and outside on different scales; from collective urban spaces down to the building` skin.
Sponsorship: Kulterman, Eva
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Title: NETWORK CODING BASED COOPERATIVE PEER-TO-PEER REPAIR IN WIRELESS NETWORKS
Creator: Liu, Yu
Date: 2012-07-11, 2012-07
Description: Multimedia Broadcast/Multicast Service (MBMS) in cellular networks has emerged recently as a promising distribution model to provide rich...
Show moreMultimedia Broadcast/Multicast Service (MBMS) in cellular networks has emerged recently as a promising distribution model to provide rich content distribution where a batch of content is broadcast to a large number of peers simultaneously. However, ensuring efficient error-free message delivery in such a scenario is a challenge, since packet loss is inevitable due to the time-varying nature of wireless transmissions, and the server is probably overwhelmed by floods of individual retransmission requests from peers. Cooperative Peer-to-Peer (P2P) information repair has been proposed to mitigate the packet loss among peers during Base Station (BS) broadcast, by allowing peers to cooperate on information exchange among themselves, rather than asking the BS to rebroadcast the lost packets for the peers. Network Coding, a fairly recent transmission paradigm with the potential network throughput improvement and high reliability advantage, has been widely recognized as a promising information dissemination approach for wireless networks. In this research, we study the network coding based cooperative P2P information repair in wireless networks. We first propose our initial work - a connected dominating set (CDS) based P2P information repair (PPIR) protocol with network coding which utilize the clustering idea, to minimize the total repair latency as well as alleviate the congestion and burden of BS’s downlink channels. Then the decision making problem for P2P repair with densely distributed nodes is studied and two approaches are provided. Later on, the NC based P2P information repair protocol with tunable parameter (NC-PIRTP) which evolved from PPIR protocol is proposed to further reduce transmission collisions and total repair latency. At last, P2P information repair under mobile network environment with pedestrian speed is studied and three efficient protocols are illustrated which are suitable to different specific cases. Extensive simulation results are provided for performance evaluation and comparisons, and to demonstrate the effectiveness and efficiency of our proposed protocols in terms of the total repair latency. Furthermore, an analytical model is developed, based on which theoretical results are derived. These results validate our protocol models and provide useful protocol design guideline for the cooperative P2P information repair problem in wireless networks.
Ph.D. in Electrical Engineering, July 2012
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Title: POWER SYSTEM VOLTAGE STABILITY AND AGENT BASED DISTRIBUTION AUTOMATION IN SMART GRID
Creator: Nguyen, Cuong Phuc
Date: 2011-04-25, 2011-05
Description: Our interconnected electric power system is presently facing many challenges that it was not originally designed and engineered to handle. The...
Show moreOur interconnected electric power system is presently facing many challenges that it was not originally designed and engineered to handle. The increased interarea power transfers, aging infrastructure, and old technologies, have caused many problems including voltage instability, widespread blackouts, slow control response, among others. These problems have created an urgent need to transform the present electric power system to a highly stable, reliable, efficient, and self-healing electric power system of the future, which has been termed “smart grid”. This dissertation begins with a discussion on the voltage stability issue in bulk transmission networks. A new continuation power flow tool for studying the impacts of generator merit order based dispatch on inter-area transfer capability and static voltage stability is presented. In using this tool, it is realized that all distribution systems are represented by only a single lumped load model. While this representation is acceptable in traditional power system analysis, it may not be valid in the future smart grid where the distribution system will be integrated with intelligent and quick control capabilities to mitigate voltage problems before they propagate into the entire system. Therefore before analyzing the operation of the whole smart grid, it is important to understand the distribution system first. The second part of this dissertation presents a new platform for studying and testing emerging technologies in advanced Distribution Automation (DA) within smart grids. Due to the key benefits over the traditional centralized approach, namely flexible deployment, scalability, and avoidance of single-point-of-failure, a new distributed approach is employed to design and develop all elements of the platform. The multi-agent system (MAS), which has the three key characteristics of autonomy, local view, and decentralization, is selected to implement the advanced DA functions. The intelligent agents utilize the communication network for cooperation and negotiation. Communication latency is modeled using a user-defined probability density function. Failure-tolerant communication strategies are developed for agent communications. Major elements of advanced DA are developed in a completely distributed way and successfully tested for several IEEE standard systems, including: Fault Detection, Location, Isolation, and Service Restoration (FLISR); Coordination of Distributed Energy Storage Systems (DES); Distributed Power Flow (DPF); Volt-VAR Control (VVC); and Loss Reduction (LR).
Ph.D. in Electrical Engineering, May 2011
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Title: Statistical process monitoring and disturbance diagnosis in multivariable continuous processes
Creator: Raich, A., Cinar, A.
Date: 1996-04
Publisher: AMER INST CHEMICAL ENGINEERS
Description: Detecting out-of-control status and diagnosing disturbances leading to the abnormal process operation early are crucial in minimizing product...
Show moreDetecting out-of-control status and diagnosing disturbances leading to the abnormal process operation early are crucial in minimizing product quality variations Multivariate statistical techniques are used to develop detection methodology for abnormal process behavior and diagnosis of disturbances causing poor process performance. Principal components and discriminant analysis ave applied to quantitatively describe and interpret step, ramp and random-variation disturbances. All disturbances require high-dimensional models for accurate description and cannot be discriminated by biplots. Diagnosis of simultaneous multiple faults is addressed by building quantitative measures of overlap between models of single faults and their combinations. These measures are used to identify the existence of secondary disturbances and distinguish their components. The methodology is illustrated by monitoring the Tennessee Eastman plant simulation benchmark problem subjected to different disturbances. Most of the disturbances can be diagnosed correctly, the success rate being higher for step and vamp disturbances than random-variation disturbances.
Endnote format citation
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Title: Reversal in Spreading of a Tabbed Circular Jet Under Controlled Excitation
Creator: Zaman, Kbmq, Raman, G.
Date: 1997-12
Publisher: American Inst Physics
Description: Detailed flow field measurements have been carried out for a turbulent circular jet perturbed by tabs and artificial excitation. Two ''delta...
Show moreDetailed flow field measurements have been carried out for a turbulent circular jet perturbed by tabs and artificial excitation. Two ''delta tabs'' were placed at the nozzle exit at diametrically opposite locations. The excitation condition involved subharmonic resonance that manifested in a periodic vortex pairing in the near flow field. While the excitation and the tabs independently increased jet spreading, a combination of the two diminished the effect. The jet spreading was most pronounced with the tabs but was reduced when excitation was applied to the tabbed jet. The tabs generated streamwise vortex pairs that caused a lateral spreading of the jet in a direction perpendicular to the plane containing the tabs. The excitation, on the other hand, organized the azimuthal vorticity into coherent ring structures whose evolution and pairing also increased entrainment by the jet. In the tabbed case, the excitation produced coherent azimuthal structures that were distorted and asymmetric in shape. The self-induction of these structures produced an effect that opposed the tendency for the lateral spreading of the streamwise vortex pairs. The passage of the distorted vortices, and their pairing, also had a cancellation effect on the time-averaged streamwise vorticity field. These led to the reduction in jet spreading. [S1070-6631(97)03012-2].
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Title: MODELING, CONTROL, AND DESIGN OF HYBRID FUEL CELL VEHICLES
Creator: Ahmed, Syed
Date: 2011-12, 2011-12
Description: The Polymer Electrolyte Membrane Fuel Cell (PEMFC) has been projected to be the fuel cell of choice for future automotive applications. Among...
Show moreThe Polymer Electrolyte Membrane Fuel Cell (PEMFC) has been projected to be the fuel cell of choice for future automotive applications. Among the challenging aspects of this application is maintaining highly efficient operation of the fuel cell. The key component of the PEMFC, the Nafion Membrane, can reach two critical states: drying and flooding. In drying, high resistance prevents normal operation of the fuel cell. In flooding, reactants are prevented from reaching reaction sites and there is a reduction of performance of the fuel cell. To address the first point, a spatially distributed along the plane membrane model was developed and tested with proportional-integral control of voltage and temperature. To analyze the occurrence of severe and frequent changes in power demand, a model aimed at mimicking the load expected in a fuel cell vehicle, including a DC motor, DC-DC converters and a rechargeable battery for peak-shaving and regenerative braking was developed. The model includes rotational and translational inertia as well as a simple wind resistance model for a vehicle. In contrast to simple lab-focused loads where load impendence is directly manipulated, the manipulated variable within this load is the DC-DC converter gain. Based on this model a control system architecture was developed consisting of a number of low level regulatory loops, a power distributor for peak-shaving and finally a high level loop for tracking vehicle speed. After understanding the load demands to a fuel cell vehicle with only a battery, the issue of multiple energy storage technologies is addressed. Designing a vehicle with these technologies poses an optimization problem. A high-level model of a fuel cell vehicle with two storage technologies, a battery and super-capacitor was developed. The model accounted for the constraints of each component and a drive cycle characterized the power demand. An economic-based optimization problem xv was posed whereas its objective was to minimize the capital cost of the system, while meeting power demand and keeping the technologies within their constraints. The result of the optimization provided a controller from which a high-level power coordination unit can be developed for the fuel cell vehicle.
Ph.D. in Chemical Engineering, December 2011
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Title: AN INVESTIGATION OF THE QUASI-STANDARD ERROR FOR QUASI-MONTE CARLO METHOD
Creator: Deng, Siyuan
Date: 2013-05-01, 2013-05
Description: In this thesis we discuss the theory of the Quasi-Standard Error(QSE) estimate which plays an important role in the practice of the Quasi...
Show moreIn this thesis we discuss the theory of the Quasi-Standard Error(QSE) estimate which plays an important role in the practice of the Quasi-Monte Carlo method. In the first part the deduction using Walsh series reveals an expression for the Quasi- Standard Error for digital nets. The second part of this thesis a special class of functions has been designed to fool the Quasi-Standard Error, and based on the previous theory we reveal the reason why the Quasi-Standard-Error can be fooled. The third part, apply the theory we developed to some actual application in financial mathematics, to see if the QSE works well in practice. There are mixed results.
M.S. in Applied Mathematics, May 2013
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Title: Fault detection and diagnosis in a food pasteurization process with hidden Markov models
Creator: Tokatli, F., Cinar, A.
Date: 2004-12
Publisher: CANADIAN SOC CHEMICAL ENGINEERING
Description: Hidden Markov Models (HMM) are used to detect abnormal operation of dynamic processes and diagnose sensor and actuator faults. The method is...
Show moreHidden Markov Models (HMM) are used to detect abnormal operation of dynamic processes and diagnose sensor and actuator faults. The method is illustrated by monitoring the operation of a pasteurization plant and diagnosing causes of abnormal operation. Process data collected under the influence of faults of different magnitude and duration in sensors and actuators are used to illustrate the use of HMM in the detection and diagnosis of process faults. Case studies with experimental data from a high-temperature-short-time pasteurization system showed that HMM can diagnose the faults with certain characteristics such as fault duration and magnitude.
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Title: Overview of Higgs results from CMS, Proceedings of the XLIII International Symposium on Multiparticle Dynamics
Creator: Merkel, Petra
Date: 2013-09-15, 2013-09-15
Publisher: IIT Press
Description: Sponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
In this article we present an overview of...
Show moreSponsorship: IIT College of Science, High Energy Physics Division of Argonne National Laboratory
In this article we present an overview of Higgs boson results from the CMS Collaboration as presented at the ISMD13 conference.
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Title: NON-LINEAR CREEP-RELAXATION CONSTITUTIVE MODEL FOR PLAIN CONCRETE WITH ANISOTROPIC DAMAGE
Creator: Teran Torres, Bernardo
Date: 2016, 2016-05
Description: A thermodynamic constitutive model for plain concrete, and other quasi-brittle materials, is developed. The model accounts for the anisotropic...
Show moreA thermodynamic constitutive model for plain concrete, and other quasi-brittle materials, is developed. The model accounts for the anisotropic damage-induced and the aging viscoelasticity of the material. The model is based on the theory of solidi cation proposed by Baºant and the continuum damage mechanics theory. The material is considered to be a viscoelastic-damageable material. The Helmholtz free energy utilized in the formulation is treated by means of the representation theorem of coupled damage-strain tensors. The model is capable of analyzing time-dependent damage (tertiary creep) under constant loading and damage due to cyclic creep. Two simple but practical examples are presented in order to illustrate the applicability of the model. The determination of the functions and constants representing the material behavior as well as any experimental companion is proposed for the continuation of the research.
Ph.D. in Civil Engineering, May 2016
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