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Dissertations / Theses on the topic 'Viscoelastic continuum damage model'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Hou, Tian. "Fatigue Performance Prediction of North Carolina Mixtures Using Simplified Viscoelastic Continuum Damage Model." NCSU, 2009. http://www.lib.ncsu.edu/theses/available/etd-07102009-011752/.

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Fatigue performance modeling is one the major topics in asphalt concrete modeling work. Currently the only standard fatigue test available for asphalt concrete mixtures is the flexural bending fatigue test, AASHTO T-321. There are several issues associated with flexural fatigue testing, the most important of which are the stress state is not uniform but varies over the depth of the specimen and equipment for fabricating beam specimens is not widely available. Viscoelastic continuum damage (VECD) fatigue testing is a promising alternative to flexural fatigue testing. Different researchers have

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2

Xiao, Jing. "Damage and fracture of brittle viscoelastic solids with application to ice load models." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0019/NQ47510.pdf.

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3

Freire, Reuber Arrais. "Evaluation of the coarse aggregate influence in the fatigue damage using fine aggregate matrices with different maximum nominal sizes." reponame:Repositório Institucional da UFC, 2015. http://www.repositorio.ufc.br/handle/riufc/13875.

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FREIRE, R. A. Evaluation of the coarse aggregate influence in the fatigue damage using fine aggregate matrices with different maximum nominal sizes. 2015. 86 f. Dissertação (Mestrado em Engenharia de Transportes) – Centro de Tecnologia, Universidade Federal do Ceará, Fortaleza, 2015.<br>Submitted by Marlene Sousa (mmarlene@ufc.br) on 2015-10-29T12:42:00Z No. of bitstreams: 1 2015_dis_rafreire.pdf: 6423026 bytes, checksum: 9ed8a164fac500a20720f0a2df391b94 (MD5)<br>Approved for entry into archive by Marlene Sousa(mmarlene@ufc.br) on 2015-11-03T18:17:39Z (GMT) No. of bitstreams: 1 2015_dis_rafrei

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4

Pelà, Luca. "Continuum damage model for nonlinear analysis of masonry structures." Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/30327.

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The present work focuses on the formulation of a Continuum Damage Mechanics model for nonlinear analysis of masonry structural elements. The material is studied at the macro-level, i.e. it is modelled as a homogeneous orthotropic continuum. The orthotropic behaviour is simulated by means of an original methodology, which is based on nonlinear damage constitutive laws and on the concept of mapped tensors from the anisotropic real space to the isotropic fictitious one. It is based on establishing a one-to-one mapping relationship between the behaviour of an anisotropic real material and that of

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5

PELA', Luca. "CONTINUUM DAMAGE MODEL FOR NONLINEAR ANALYSIS OF MASONRY STRUCTURES." Doctoral thesis, Università degli studi di Ferrara, 2009. http://hdl.handle.net/11392/2389195.

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The present work focuses on the formulation of a Continuum Damage Mechanics model for nonlinear analysis of masonry structural elements. The material is studied at the macro-level, i.e. it is modelled as a homogeneous orthotropic continuum. The orthotropic behaviour is simulated by means of an original methodology, which is based on nonlinear damage constitutive laws and on the concept of mapped tensors from the anisotropic real space to the isotropic fictitious one. It is based on establishing a one-to-one mapping relationship between the behaviour of an anisotropic real material and

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6

Abdel-Rahman, Saadeh Shadi. "Characterization of asphalt concrete using anisotropic damage viscoelastic-viscoplastic model." Texas A&M University, 2005. http://hdl.handle.net/1969.1/4761.

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This dissertation presents the integration of a damage viscoelastic constitutive relationship with a viscoplastic relationship in order to develop a comprehensive anisotropic damage viscoelastic-viscoplastic model that is capable of capturing hot mix asphalt (HMA) response and performance under a wide range of temperatures, loading rates, and stress states. The damage viscoelasticity model developed by Schapery (1969) is employed to present the recoverable response, and the viscoplasticity model developed at the Texas Transportation Institute (TTI) is improved and used to model the irrecoverab

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7

Searcy, Chad Randall. "A multiscale model for predicting damage evolution in heterogeneous viscoelastic media." Diss., Texas A&M University, 2004. http://hdl.handle.net/1969.1/1251.

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A multiple scale theory is developed for the prediction of damage evolution in heterogeneous viscoelastic media. Asymptotic expansions of the field variables are used to derive a global scale viscoelastic constitutive equation that includes the effects of local scale damage. Damage, in the form discrete cracks, is allowed to grow according to a micromechanically-based viscoelastic traction-displacement law. Finite element formulations have been developed for both the global and local scale problems. These formulations have been implemented into a two-scale computational model Numerical res

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8

Tashman, Laith. "Microstructural viscoplastic continuum model for asphalt concrete." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/313.

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This dissertation presents the development of an anisotropic viscoplastic continuum damage model to describe the permanent deformation of asphalt pavements. The model is developed to account for several phenomena that influence the permanent deformation of Asphalt Concrete (AC) at high temperatures. These phenomena include strain rate dependency, confining pressure dependency, dilation, aggregate friction, anisotropy, and damage. The model is based on Perzyna's theory of viscoplasticity with Drucker-Prager yield function modified to account for the microstructure anisotropy and damage. A para

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9

Saha, Reema. "Investigation of a continuum damage model using experimental and numerical techniques." Diss., Georgia Institute of Technology, 1995. http://hdl.handle.net/1853/12542.

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10

Ho, Kwang-Il. "An anisotropic continuum damage model for creep-dominated, multiaxial loading histories." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/20043.

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11

王軍 and Chun Wang. "Development of an anisotropic damage mechanics model in ductile fracture." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1987. http://hub.hku.hk/bib/B31231378.

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12

Wang, Chun. "Development of an anisotropic damage mechanics model in ductile fracture /." [Hong Kong : University of Hong Kong], 1987. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12362864.

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13

Dondeti, Piyush Prashant. "Rate-Dependent Homogenization based Continuum Plasticity Damage Model for Dendritic Cast Aluminum Alloys." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1308245866.

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14

Williams, Kevin Vaughan. "A physically-based continuum damage mechanics model for numerical prediction of damage growth in laminated composite plates." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0010/NQ39002.pdf.

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15

Josefsson, Axel, and Johan Wedin. "Convergence properties of a continuum damage mechanics model for fatigue of adhesive joints." Thesis, Högskolan i Skövde, Institutionen för ingenjörsvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:his:diva-10188.

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The effect of the element length is examined in modelling crack growth in fatigue loading of an adhesive joint. This is done for a cohesive element using an expression for the damage evolution developed at the University of Skövde which is implemented using the UMAT subroutine in the FE-solver Abaqus. These analyses are done for pure mode I loading by analysing a DCB-specimen loaded by a pure moment. An expression is developed in which the critical element length is dependent on the geometry of the specimen (in the form of the wave number of the adhesive joint), the element length, the materia

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16

Su, Yang. "Rest Period Healing Effect on Viscoelastic Continuum Damage Behaviour of Asphalt Mixture: Experimental Quantification and Numerical Verification of a New Approach." Thesis, Curtin University, 2019. http://hdl.handle.net/20.500.11937/75047.

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Rest period healing effect on viscoelastic continuum damage behaviour of asphalt mixture is systematically through simplified VECD and 4PB beam fatigue tests with various length of rest period after each load cycle. A new equation is proposed to interpret damage characteristic curves with rest period. Novel methods are developed to model beam fatigue tests results through derived VECD healing model. The new functions are evaluated and verified by comparison of simulation and experiment results.

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17

Bai, Jie. "A homogenization based continuum plasticity-damage model for ductile fracture of materials containing heterogeneities." Columbus, Ohio : Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1211910660.

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18

Bai, Jie. "A Homogenization based Continuum Plasticity-Damage Model for Ductile Frature of Materials Containing Heterogeneities." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1211910660.

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19

Jelvehpour, Ali. "Development of a transient gradient enhanced non local continuum damage mechanics model for masonry." Thesis, Queensland University of Technology, 2016. https://eprints.qut.edu.au/93365/1/Ali_Jelvehpour_Thesis.pdf.

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Due to the advent of varied types of masonry systems a comprehensive failure mechanism of masonry essential for the understanding of its behaviour is impossible to be determined from experimental testing. As masonry is predominantly used in wall structures a biaxial stress state dominates its failure mechanism. Biaxial testing will therefore be necessary for each type of masonry, which is expensive and time consuming. A computational method would be advantageous; however masonry is complex to model which requires advanced computational modelling methods. This thesis has formulated a damage mec

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20

Reberg, Andrew Steven. "An Anisotropic Damage Mechanics Model for Concrete with Applications for Fatigue Loading and Freeze-Thaw Effects." Thesis, North Dakota State University, 2013. https://hdl.handle.net/10365/26994.

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It is well known that the formation and propagation of microcracks within concrete is anisotropic in nature, and has a degrading effect on its mechanical performance. In this thesis an anisotropic damage mechanics model is formulated for concrete which can predict the behavior of the material subjected to monotonic loading, fatigue loading, and freeze-thaw cycles. The constitutive model is formulated using the general framework of the internal variable theory of thermodynamics. Kinetic relations are used to describe the directionality of damage accumulation and the associated softening of mech

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21

HUBSCHER, FREDERICO PABLO. "A CONTINUUM DAMAGE MODEL FOR THE ANALYSIS OF LOW CICLE FATIGUE IN ELASTO-VISCOPLASTIC BARS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1992. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=19139@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>O presente trabalho da modelagem da fadiga plástica oligocíclica de barras também conhecida na literatura como fadiga de baixo ciclo. O modelo unidimensional proposto é desenvolvido a partir dos princípios básicos da Mecânica do Dano Contínuo. Seu principal objetivo é considerar a influencia de vários fenômenos complexos – como a história da deformação plástica, a viscosidade, o endurecimento e o amolecimento cíclico induzido pela deformação plástica acumulada – na vida da estrutura. As equações constitutivas, usadas ao longo do t

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22

Herrero, Javier. "Buckling, postbuckling and progressive failure analysis of hybrid composite shear webs using a continuum damage mechanics model." Diss., Wichita State University, 2007. http://hdl.handle.net/10057/1488.

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This dissertation presents an innovative analysis methodology to enhance the design of composite structures by extending their work range into the postbuckling regime. This objective is accomplished by using the numerical simulation capabilities of nonlinear finite element analysis combined with continuum damage mechanics models to simulate the onset of failure and the subsequent material properties degradation. A complete analysis methodology is presented with increasing levels of complexity. The methodology is validated by correlation of analytical results with experimental data from a set o

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23

Herrero, Javier Locke James Yang Charles. "Buckling, postbuckling and progressive failure analysis of hybrid composite shear webs using a continuum damage mechanics model /." Diss., A link to full text of this thesis in SOAR, 2007. http://hdl.handle.net/10057/1488.

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24

Nusit, Korakod. "Development of an Advanced Fatigue Model of a Cement-Treated Base Material Based on Continuum Damage Mechanics." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/53022.

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Cement-Treated Base (CTB) is a mixture of a road base material, a prescribed amount of cement, and water. In doing this, the performance of road pavement structure can be improved. This research aims to achieve improved CTB characterisation and design procedures. The characteristics of CTB material were examined through conventional and sophisticated testing platforms. Accordingly, the new mix design framework and fatigue damage evolution model were developed based on the test results of this research.

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25

Tigabu, Romel. "Modeling static creep with stress reversals of mastic asphalt." Thesis, KTH, Transportvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-50950.

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This thesis studies the strain response of mastic asphalt to arbitrary tension, arbitrary compression, alternating tension/compression, loading, zigzag loading and sinusoidal loading. In order to model the strain response to different loading histories, the scissors model is employed. Matlab modules are developed that are able to predict strain response not only for creep loading but also for other types of non constant stress loading such as zigzag loading and sinusoidal loading. In addition, another phenomological model, i.e. the viscoelastoplastic continuum damage model, is summarized and d

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26

Bhamare, Sagar D. "High Cycle Fatigue Simulation using Extended Space-Time Finite Element Method Coupled with Continuum Damage Mechanics." University of Cincinnati / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1352490187.

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27

Stewart, Calvin. "A Hybrid Constitutive Model For Creep, Fatigue, And Creep-Fatigue Damage." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/6023.

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In the combustion zone of industrial- and aero- gas turbines, thermomechanical fatigue (TMF) is the dominant damage mechanism. Thermomechanical fatigue is a coupling of independent creep, fatigue, and oxidation damage mechanisms that interact and accelerate microstructural degradation. A mixture of intergranular cracking due to creep, transgranular cracking due to fatigue, and surface embrittlement due to oxidation is often observed in gas turbine components removed from service. The current maintenance scheme for gas turbines is to remove components from service when any criteria (elongation,

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28

Lehmann, Marcus Verfasser], Stefanie [Akademischer Betreuer] [Reese, and Meinhard [Akademischer Betreuer] Kuna. "Implementation of a mesh-size-independent viscoplasticity damage model through a nonlocal continuum mechanical approach / Marcus Lehmann ; Stefanie Reese, Meinhard Kuna." Aachen : Universitätsbibliothek der RWTH Aachen, 2021. http://d-nb.info/1241891516/34.

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29

Bahadursha, Venkata Rama Lakshmi Preeethi. "Tearing of Styrene Butadiene Rubber using Finite Element Analysis." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1431029910.

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30

Aminjikarai, Vedagiri Srinivasa Babu. "An Automated Dynamic Fracture Procedure and a Continuum Damage Mechanics Based Model for Finite Element Simulations of Delamination Failure in Laminated Composites." University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1242963775.

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31

Raghavan, Prasanna. "Multi-scale analysis of elastic and debonding composites by an adaptive multi-level computational model." Columbus, Ohio : Ohio State University, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1073013372.

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Thesis (Ph. D.)--Ohio State University, 2004.<br>Title from first page of PDF file. Document formatted into pages; contains xvi, 162 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: Somnath Ghosh, Dept. of Mechanical Engineering. Includes bibliographical references (p. 155-162).

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Ng, Andressa Ka Yan. "Evaluation of the fatigue damage behavior of fine aggregate matrices prepared with modified asphalt binders." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-03012018-122026/.

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The fatigue cracking process occurs by the repeated dynamic loading from the traffic of heavy vehicle. This phenomenon initiates as microcracks and develops under two circumstances: (i) after adhesive failure, when the crack occurs at the interface aggregate-mortar, and/or (ii) after cohesive failure, when the crack develops within the mortar. Based on such interpretation of the cracking phenomenon in asphalt concrete mixtures, researchers have been using the fine aggregate matrices (FAMs) to estimate the fatigue behavior of the asphalt concrete. Good agreement is observed between the properti

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33

Klug, Andrise Buchweitz. "Evaluation of the fatigue performance of fine aggregate matrices prepared with reclaimed asphalt pavements and shale oil residue." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/18/18143/tde-19022018-112755/.

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The incorporation of recycled asphalt pavements (RAP) in the production of new asphalt mixtures is a useful alternative to the use of virgin materials, leading to economic and environmental savings. Pavement recycling created a sustainable cycle of reuse of nonrenewable natural resources, reducing the demand for new mineral aggregate and binder. However, the addition of RAP, especially at higher percentages, increases the stiffness of the asphalt mixture, because of the high stiffness of the aged binder. High stiffness makes the asphalt mixtures more prone to fatigue cracking. In order to over

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34

Tong, Xiaolong. "A Constitutive Model for Crushable Polymer Foams Used in Sandwich Panels: Theory and FEA Application." University of Akron / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=akron1596806015399848.

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35

Parrinello, Antonino. "A rate-pressure-dependent thermodynamically-consistent phase field model for the description of failure patterns in dynamic brittle fracture." Thesis, University of Oxford, 2017. https://ora.ox.ac.uk/objects/uuid:c6590f4f-f4e2-40e3-ada1-49ba35c2a594.

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The investigation of failure in brittle materials, subjected to dynamic transient loading conditions, represents one of the ongoing challenges in the mechanics community. Progresses on this front are required to support the design of engineering components which are employed in applications involving extreme operational regimes. To this purpose, this thesis is devoted to the development of a framework which provides the capabilities to model how crack patterns form and evolve in brittle materials and how they affect the quantitative description of failure. The proposed model is developed withi

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Llobet, Vallejo Jordi. "A constitutive model for fatigue and residual strength predictions of composite laminates." Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/670692.

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This thesis investigates the fatigue behaviour of fibre-reinforced composite laminates. Fatigue of composite materials is a complex subject both from an experimental and numerical modelling point of view. In this context, we designed a quite extensive experimental campaign to investigate the failure mechanisms that occur when the composite material undergoes fatigue. Then, we developed a constitutive model to anticipate the mechanical behaviour and the final strength of the material. This model was implemented inside a finite element code in order to analyse the behaviour of composite structur

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Pröchtel, Patrick. "Anisotrope Schädigungsmodellierung von Beton mit Adaptiver Bruchenergetischer Regularisierung." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2008. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1224751435667-29771.

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Der Gegenstand der vorliegenden Arbeit ist die Simulation von Betonstrukturen beliebiger Geometrie unter überwiegender Zugbelastung. Die Modellierung erfolgt auf Makroebene als Kontinuum und zur Lösung des mechanischen Feldproblems wird die Finite-Elemente-Methode verwendet. Ein neues Materialmodell für Beton und eine Erweiterung der Bruchenergetischen Regularisierung werden vorgestellt. Die Arbeit ist in zwei Teile gegliedert. Im ersten Teil wird ein lokales, anisotropes Schädigungsmodell abgeleitet, wobei als Schädigungsvariable ein symmetrischer Tensor zweiter Stufe gewählt wird. Die Verwen

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Rodrigues, Eduardo Alexandre. "Um modelo multiescala concorrente para representar o processo de fissuração do concreto." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-10052016-113532/.

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Este trabalho propõe uma técnica de modelagem multiescala concorrente do concreto considerando duas escalas distintas: a mesoescala, onde o concreto é modelado como um material heterogêneo, e a macroescala, na qual o concreto é tratado como um material homogêneo. A heterogeneidade da estrutura mesoscópica do concreto é idealizada considerando três fases distintas, compostas pelos agregados graúdos e argamassa (matriz), estes considerados materiais homogêneos, e zona de transição interfacial (ZTI), tratada como a parte mais fraca entre as três fases. O agregado graúdo é gerado a partir de uma c

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Quintanas, Corominas Adrià. "Towards a high-performance computing finite element simulation framework for virtual testing of composite structures." Doctoral thesis, Universitat de Girona, 2019. http://hdl.handle.net/10803/669323.

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his doctoral thesis aims at developing and implementing a computational framework for performing virtual testing of composite structures using a High-Performance Computing (HPC) environment. In this sense, this thesis presents several novel constitutive models based on the continuum damage mechanics theory and their implementation in the HPC-base Finite Element (FE) simulation code called Alya. The verification and validation of the models are performed comparing the numerical predictions with analytical formulations and experimental data. The comparisons demonstrate not only the reliability o

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Chen, Youbin. "Modélisation de la rupture ductile par approche locale : simulation robuste de la déchirure." Thesis, Paris Sciences et Lettres (ComUE), 2019. http://www.theses.fr/2019PSLEM038/document.

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Cette étude a pour objectif principal d’établir une stratégie de modélisation robuste, fiable et performante pour décrire des propagations de fissures d’échelle centimétrique en régime ductile dans des composants industriels. Le modèle d’endommagement de GTN écrit en grandes déformations est utilisé pour modéliser l’endommagement ductile. Ce modèle conduit généralement à une localisation de la déformation, conformément à l’expérience. L’échelle caractéristique de ce phénomène est introduite dans les équations de comportement via l’adoption d’une formulation non locale.Sur le plan numérique, ce

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Graham, Michael A. "Viscoelastic{Viscoplastic Damage Model for Asphalt Concrete." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-08-800.

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This thesis presents a continuum model for asphalt concrete incorporating non- linear viscoelasticity, viscoplasticity, mechanically-induced damage and moisture- induced damage. The Schapery single-integral viscoelastic model describes the nonlinear viscoelastic response. The viscoplastic model of Perzyna models the time- dependent permanent deformations, using a Drucker-Prager yield surface which is modified to depend on the third deviatoric stress invariant to include more complex dependence on state of stress. Mechanically-induced damage is modeled using continuum damage mechanics, using th

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42

Li, Chuanke. "Finite element analysis of ice-structure interaction with a viscoelastic model coupled with damage mechanics /." 2002.

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Bandeira, Pedro Miguel Vieira Pinto. "A continuum-damage model for advanced composites." Master's thesis, 2005. http://hdl.handle.net/10216/12340.

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Bandeira, Pedro Miguel Vieira Pinto. "A continuum-damage model for advanced composites." Dissertação, 2005. http://hdl.handle.net/10216/12340.

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"Endurance Limit for HMA Based on Healing Phenomenon Using Viscoelastic Continuum Damage Analysis." Doctoral diss., 2012. http://hdl.handle.net/2286/R.I.15096.

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abstract: Perpetual Pavements, if properly designed and rehabilitated, it can last longer than 50 years without major structural rehabilitation. Fatigue endurance limit is a key parameter for designing perpetual pavements to mitigate bottom-up fatigue cracking. The endurance limit has not been implemented in the Mechanistic Empirical Pavement Design Guide software, currently known as DARWin-ME. This study was conducted as part of the National Cooperative Highway Research Program (NCHRP) Project 9-44A to develop a framework and mathematical methodology to determine the fatigue endurance limit u

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Baek, Cheol Min. "Investigation of top-down cracking mechanisms using the viscoelastic continuum damage finite element program." 2010. http://www.lib.ncsu.edu/resolver/1840.16/6007.

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Palvadi, Naga Sundeep. "Measurement of material properties related to self-healing based on continuum and micromechanics approach." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-08-4274.

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The ability of an asphalt mix to heal is an important property that influences the overall fatigue performance of the mix in the field. Micro damage healing in an asphalt mix is a function of several factors such as the physical and chemical properties of the binder, properties of the mixture, level of damage prior to the rest period during which healing occurs, duration of the rest period, temperature, and pressure. This thesis presents details from a two-part study that addresses the following aspects. In the first part of this study, a DSR based test method was developed to measure inherent

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Deepu, S. P. "Non-Local Continuum Models for Damage in Solids and Delamination of Composites." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4206.

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The focus of the thesis is on developing new damage models for brittle materials and using these to study delamination of composite structures. Chapter 1 gives an introductory literature review in order to motivate the work undertaken in the chapters to follow. Chapter 2 deals with a new micropolar damage model for delamination in composites. By combining phase field theory and peridynamics, Chapter 3 develops a new formalism to study damage in brittle materials under dynamic loading. Chapter 4 exploits and extends this idea for modelling delamination of composites. An extended chapter-wise su

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Williams, Kevin V. "A physically-based continuum damage mechanics model for numerical prediction of damage growth in laminated composite plates." Thesis, 1998. http://hdl.handle.net/2429/10088.

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Abstract:

Rapid growth in use of composite materials in structural applications drives the need for a more detailed understanding of damage tolerant and damage resistant design. Current analytical techniques provide sufficient understanding and predictive capabilities for application in preliminary design, but current numerical models applicable to composites are few and far between and their development into well tested, rigorous material models is currently one of the most challenging fields in composite materials. The present work focuses on the development, implementation, and verification of

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50

Karki, Pravat. "An integrated approach to measure and model fatigue damage and healing in asphalt composites." Thesis, 2014. http://hdl.handle.net/2152/31322.

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Abstract:

This study presents a test and analysis method to determine both damage and healing characteristics of asphalt composites using the same test specimen. The test involves applying multiple stretches of load cycles, each separated by a period of zero load introduced at several different levels of reduced stiffness. The analytical procedure involves (1) using modified correspondence principles to transform the time-dependent physical quantities (stress, strain and energy density) into time-independent pseudo-elastic quantities, and then (2) using viscoelastic continuum damage mechanics to quantif

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