Gotowe bibliografie tematyczne / Micropolar Cohesive Damage Model

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Gotowa bibliografia na temat „Micropolar Cohesive Damage Model”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Micropolar Cohesive Damage Model"

Rahaman, Md M., S. P. Deepu, D. Roy i J. N. Reddy. "A micropolar cohesive damage model for delamination of composites". Composite Structures 131 (listopad 2015): 425–32. http://dx.doi.org/10.1016/j.compstruct.2015.05.026.

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Suh, Hyoung Suk, WaiChing Sun i Devin T. O’Connor. "A phase field model for cohesive fracture in micropolar continua". Computer Methods in Applied Mechanics and Engineering 369 (wrzesień 2020): 113181. http://dx.doi.org/10.1016/j.cma.2020.113181.

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Roy, Samit, i Yong Wang. "Analytical Solution for Cohesive Layer Model and Model Verification". Polymers and Polymer Composites 13, nr 8 (listopad 2005): 741–52. http://dx.doi.org/10.1177/096739110501300801.

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The objective of this work was to find an analytical solution to the stresses in the cohesive damage zone and the damage zone length at the interface between a fibre reinforced polymer (FRP) plate and concrete substrate. Analytical solutions have been derived to predict the stress in the cohesive layer when considering the deformation in the stiff substrate. A two-dimensional cohesive layer constitutive model with a prescribed traction-separation (stress-strain) law was constructed using a modified Williams' approach, and analytical solutions derived for the elastic zone as well as the damage zone. Detailed benchmark comparisons of analytical results with finite element predictions for a double cantilever beam specimen were performed for model verification, and issues related to cohesive layer thickness were investigated. It was observed that the assumption of a rigid substrate in analytical modelling can lead to inaccurate analytical prediction of the cohesive damage zone length.

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Pouya, Ahmad, i Pedram Bemani Yazdi. "A damage-plasticity model for cohesive fractures". International Journal of Rock Mechanics and Mining Sciences 73 (styczeń 2015): 194–202. http://dx.doi.org/10.1016/j.ijrmms.2014.09.024.

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Silitonga, Sarmediran, Johan Maljaars, Frans Soetens i Hubertus H. Snijder. "Numerical Simulation of Fatigue Crack Growth Rate and Crack Retardation due to an Overload Using a Cohesive Zone Model". Advanced Materials Research 891-892 (marzec 2014): 777–83. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.777.

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In this work, a numerical method is pursued based on a cohesive zone model (CZM). The method is aimed at simulating fatigue crack growth as well as crack growth retardation due to an overload. In this cohesive zone model, the degradation of the material strength is represented by a variation of the cohesive traction with respect to separation of the cohesive surfaces. Simulation of crack propagation under cyclic loads is implemented by introducing a damage mechanism into the cohesive zone. Crack propagation is represented in the process zone (cohesive zone in front of crack-tip) by deterioration of the cohesive strength due to damage development in the cohesive element. Damage accumulation during loading is based on the displacements in the cohesive zone. A finite element model of a compact tension (CT) specimen subjected to a constant amplitude loading with an overload is developed. The cohesive elements are placed in front of the crack-tip along a pre-defined crack path. The simulation is performed in the finite element code Abaqus. The cohesive elements behavior is described using the user element subroutine UEL. The new damage evolution function used in this work provides a good agreement between simulation results and experimental data.

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Kim, Dae Kyu. "A constitutive model with damage for cohesive soils". KSCE Journal of Civil Engineering 8, nr 5 (wrzesień 2004): 513–19. http://dx.doi.org/10.1007/bf02899578.

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Goodarzi, M. Saeed, Hossein Hosseini-Toudeshky i Meisam Jalalvand. "Shear-Mode Viscoelastic Damage Formulation Interface Element". Key Engineering Materials 713 (wrzesień 2016): 167–70. http://dx.doi.org/10.4028/www.scientific.net/kem.713.167.

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In this paper, a viscoelastic-damage cohesive zone model is formulated and discussed. The interface element constitutive law has two elastic and damage regimes. Viscoelastic behaviour has been assumed for the shear stress in the elastic regime. Three element Voigt model has been used for the formulation of relaxation modulus of the material. Shear Stress has been evaluated in the elastic regime of the interface with integration over the history of the applied strain at the interface. Damage evolution proceeds according to the bilinear cohesive constitutive law up to the complete decohesion. Numerical examples for one element model has been presented to see the effect of parameters on cohesive constitutive law.

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Abu Al-Rub, Rashid K., i Ammar Alsheghri. "Cohesive Zone Damage-Healing Model for Self-Healing Materials". Applied Mechanics and Materials 784 (sierpień 2015): 111–18. http://dx.doi.org/10.4028/www.scientific.net/amm.784.111.

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A cohesive zone damage-healing model (CZDHM) derived based on the laws of thermodynamics for self-healing materials is presented. The well-known nominal, healing, and effective configurations of classical continuum damage mechanics are extended to self-healing materials. A new physically-based internal crack healing state variable is proposed for describing the healing evolution within the crack cohesive zone. The effects of temperature, crack-closure, and resting time on the healing behavior are discussed. Numerical examples are conducted to show the various novel features of the formulated CZDHM.

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Kale, Sohan, Seid Koric i Martin Ostoja-Starzewski. "Stochastic Continuum Damage Mechanics Using Spring Lattice Models". Applied Mechanics and Materials 784 (sierpień 2015): 350–57. http://dx.doi.org/10.4028/www.scientific.net/amm.784.350.

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In this study, a planar spring lattice model is used to study the evolution of damage variabledLin disordered media. An elastoplastic softening damage constitutive law is implemented which introduces a cohesive length scale in addition to the disorder-induced one. The cohesive length scale affects the macroscopic response of the lattice with the limiting cases of perfectly brittle and perfectly plastic responses. The cohesive length scale is shown to affect the strength-size scaling such that the strength increases with increasing cohesive length scale for a given size. The formation and interaction of the microcracks is easily captured by the inherent discrete nature of the model and governs the evolution ofdL. The proposed method provides a way to extract a mesoscale dependent damage evolution rule that is linked directly to the microstructural disorder.

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Iqbal, Javed. "Numerical Simulation of Cracking in Asphalt Concrete Through Continuum and Discrete Damage Model". International Journal for Research in Applied Science and Engineering Technology 9, nr 11 (30.11.2021): 2018——2020. http://dx.doi.org/10.22214/ijraset.2021.39123.

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Abstract: This study describes the development of Continuum and Discrete Damage Models in commercial finite element code Abaqus/Standard. The Concrete Damage Plasticity Model has been simulated, analysed, and compared the result with the experimental data. For verification, the Cohesive Zone Model has been simulated and analysed. Furthermore, the Extended Finite Element Model and concrete damage model are discussed and compared. The continuum damage model tends to simulate the complex fracture behaviour like crack initiation and propagation along with the invariance of the result, while the cohesive zone model can simulate and propagate the crack as well as the good agreement of the result. Further work in the proposed numerical models can better simulate the fracture behaviour of asphalt concrete in near future. Keywords: Model, Concrete, Cohesive Zone, Finite element, Abaqus.

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Rozprawy doktorskie na temat "Micropolar Cohesive Damage Model"

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 results are given for several example problems in order to demonstrate the effectiveness of the technique.

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Li, Xiaole. "An extended cohesive damage model for simulating crack propagation in fibre reinforced composies". Thesis, University of Portsmouth, 2016. https://researchportal.port.ac.uk/portal/en/theses/an-extended-cohesive-damage-model-for-simulating-crack-propagation-in-fibre-reinforced-composies(c8a15f4e-826e-444a-9c8a-758b75f8c742).html.

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This thesis presents an extended cohesive damage model (ECDM) for simulating crack propagation in fibre reinforced composites. By embedding the cohesive zone model (CZM) into the eXtended Finite Element Method (XFEM)and eliminating the enriched degree of freedoms (DoFs), the ECDM defines the cohesive crack path in an implicit way in equilibrium equations and enables the local enrichments of approximation spaces without additional DoFs. The contribution from additional DoFs can be accounted via the DoFs elimination,which allows discontinuities to exist within a finite element rather than the element boundaries. To account for the evolution of cohesion before crack propagation, in this developed ECDM, a new equivalent damage variable with respect to strain field is introduced to avoid the appearance of enriched DoFs,and to substitute the conventional characterization in the approximation of displacement jump. This variable is achieved based on the energy dissipation during post-failure process to characterize the damage evolution. Therefore,the constant dissipation of fracture energy during failure process is guaranteed. Eliminating the enrichment by adopting a condensation technique, the ECDM is expected to provide significant superiority in computational efficiency when modelling crack propagation in materials. The performance of the present ECDM is demonstrated by the initial applications in simulation of crack propagation in homogeneous and heterogonous structures, which show that the developed ECDM works well when comparing to experiment work and XFEM analysis. Regarding the computational cost, the ECDM can ease the computational burden by more than 60% reduction in terms of CPU time without sacrificing numerical accuracy and robustness. The feasibility of the ECDM in capturing delamination migration within fibre reinforced laminated composites is verified. Good agreements with experimental work are obtained and the present model’s advantage in accuracy and numerical efficiency comparing to CZM based model is demonstrated. This work makes contribution to academic knowledge and technology translation by the following points: 1. It is the first time to theoretically derive the fully condensed equilibrium equations of the ECDM based on the framework of XFEM; 2. An equivalent damage variable with respect to strain field is introduced for characterizing the effects from enriched DoFs and cohesive traction, which avoids physical displacement jump in presenting strong discontinuities; 3. A significant improvement of computing efficiency in non-linear fracture analysis is achieved through eliminating the enriched DoFs required by XFEM; 4. The developed ECDM provides a highly efficient tool for academics and engineers in predicting detailed multicrack failure mechanism in engineering materials and structures; 5. The ECDM is developed using common computer language FORTRAN, which can be easily integrated into other FEM commercial packages.

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Thomas, Michael Andrew. "Framework for Cohesive Zone Model Based Multiscale Damage Evolution in a Fatigue Environment". Wright State University / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=wright1308257790.

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May, Michael. "A new model for initiation of damage in composites under fatigue loading for cohesive elements". Thesis, University of Bristol, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.521074.

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Li, Bo. "Applications of Cohesive Zone Models in Dynamic Failure Analysis". University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459953377.

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Josefsson, Axel, i 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 material properties of the adhesive (in form of the material parameters , , ), the load applied (in form of the stress in the crack tip), the time step used in the analysis and the crack growth rate. It is shown that the results converge by decreasing the element length and the time step used. Therefore an expression for the crack growth rate as a function of the remaining parameters can be determined. Another expression is thereafter developed for the element length needed in order to get a crack growth rate within a certain range of the critical element length. The results show a regular pattern but are not monotone. Therefor two different definitions of the critical element length are tested, either by defining the critical element length as the point where the error is greater than an arbitrary boundary of 1 % of a converged result or where a least square approximation of the error is within 1 % of the converged results. The first method shows a highly irregular result which makes it difficult to develop an expression out of these results. The second method on the other hand gives results that are predictable enough to develop a function out of them. This is done using a regression analysis with all parameters of a third order expression in order to get an expression.

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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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Cuvilliez, Sam. "Passage d’un modèle d’endommagement continu régularisé à un modèle de fissuration cohésive dans le cadre de la rupture quasi-fragile". Thesis, Paris, ENMP, 2012. http://www.theses.fr/2012ENMP0064/document.

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Les travaux présentés dans ce mémoire s'inscrivent dans l'étude et l'amélioration des modèles d'endommagement continus régularisés (non locaux), l'objectif étant d'étudier la transition entre un champ d'endommagement continu défini sur l'ensemble d'une structure et un modèle discontinu de fissuration macroscopique.La première étape consiste en l'étude semi-analytique d'un problème unidimensionnel (barre en traction) visant à identifier une famille de lois d'interface permettant de basculer d'une solution non homogène obtenue avec un modèle continu à gradient d'endommagement vers un modèle discontinu de fissuration cohésive. Ce passage continu / discontinu est construit de telle sorte que l'équivalence énergétique entre les deux modèles soit assurée, et reste exacte quelque soit le niveau de dégradation atteint par le matériau au moment où cette transition est déclenchée.Cette stratégie est ensuite étendue au cadre 2D (et 3D) éléments finis dans le cas de la propagation de fissures rectilignes (et planes) en mode I. Une approche explicite basée sur un critère de dépassement d'une valeur « critique » de l'endommagement est proposée afin de coupler les modèles continus et discontinus au sein d'un même calcul quasi-statique par éléments finis. Enfin, plusieurs résultats de simulations menées avec cette approche couplée sont présentés
The present work deals with the study and the improvement of regularized (non local) damage models. It aims to study the transition from a continuous damage field distributed on a structure to a discontinuous macroscopic failure model.First, an analytical one-dimensional study is carried out (on a bar submitted to tensile loading) in order to identify a set of interface laws that enable to switch from an inhomogeneous solution obtained with a continuous gradient damage model to a cohesive zone model. This continuous / discontinuous transition is constructed so that the energetic equivalence between both models remains ensured whatever the damage level reached when switching.This strategy is then extended to the bi-dimensional (and tri-dimensional) case of rectilinear (and plane) crack propagation under mode I loading conditions, in a finite element framework. An explicit approach based on a critical damage criterion that allows coupling both continuous and discontinuous approaches is then proposed. Finally, results of several simulations led with this coupled approach are presented

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Swindeman, Michael James. "A Regularized Extended Finite Element Method for Modeling the Coupled Cracking and Delamination of Composite Materials". University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1324605778.

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Cabello, Ulloa Mario Javier. "Desarrollo de modelos para el cálculo de uniones estructurales con adhesivos flexibles". Doctoral thesis, Universitat de Girona, 2016. http://hdl.handle.net/10803/403837.

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The use of adhesive joints in industrial structural applications is currently growing. Nevertheless, the designing process is still a challenge for engineers because there is a lack of effective models to predict their behaviour. In particular, the use of flexible adhesives has been become a trend in the industry because of the advantages that they offer, and many research are ongoing in order to develop effective analytical models for its design. Current models, which are developed for compressible rigid adhesives, are unable to accurately predict the behaviour of flexible adhesives joints with low elastic modulus, incompressibility and large strain to failure. The more advanced analytical models take in account the elasticity of adhesive as a constant distribution and still they do not offer enough precision because they do not consider the influence of the stress state to the stiffness, the influence of the damage and the large deformations present in the adhesive layer.
Les unions adhesives són especialment interessants en aplicacions estructurals i el seu ús ha augmentat notablement en la industria moderna. No obstant, el disseny d’una unió adhesiva segueix essent actualment un repte per als enginyers, doncs no es disposa de models eficaços per a predir el seu comportament. Particularment, la utilització d’adhesius flexibles s’està estenent cada vegada méss degut als avantatges que aquests ofereixen, i actualment s’estan duent a terme nombrosos esforços per obtenir models analítics méss eficaços que permetin poder analitzar-ne el seu comportament. Els models existents, desenvolupats per adhesius compressibles i rígids no son capaços de predir amb precisió el comportament d’unions amb adhesius flexibles, que presenten un mòdul elàstic baix, incompressibilitat i grans deformacions fins a la seva ruptura. Els models analítics més avançats incorporen l’efecte de l’elasticitat de l’adhesiu en la seva formulació com una distribució constant, i com que no tenen en compte aspectes com l’efecte de les tensions sobre la rigidesa de l’adhesiu, la influència del dany i les grans deformacions a la capa de l’adhesiu no són suficientment precisos en la modelització del comportament de la unió.
Las uniones adhesivas son de especial interés en aplicaciones estructurales y su uso ha aumentado notablemente en la industria moderna. Sin embargo, el diseño de uniones adhesivas sigue siendo a día de hoy un reto para los ingenieros que carecen de modelos eficaces para la predicción de su comportamiento. En particular, el uso de adhesivos flexibles se ha convertido en una tendencia en la industria debido a las ventajas que estos ofrecen y se están dedicando numerosos esfuerzos para lograr modelos analíticos más eficaces. Los modelos existentes, desarrollados para adhesivos compresibles rígidos, no son capaces de predecir con precisión el comportamiento de uniones con adhesivos flexibles que presentan bajo módulo elástico, incompresibilidad y grandes deformaciones hasta la rotura. Los modelos analíticos más avanzados incorporan el efecto de la elasticidad del adhesivo en su formulación como una distribución constante y aún carecen de suficiente precisión debido a que no toman en cuenta efectos como la influencia del estado tensional sobre la rigidez, la influencia del daño y las grandes deformaciones presentes en la capa de adhesivo.
Lotura itsasgarriak interes handiko loturak dira aplikazio estrukturaletarako eta bereerabilera nabarmenki handitzen joan da industria mailan. Hala ere, gaur egun loturaitsasgarrien diseinuak erronka izaten jarraitzen du, ingeniariek horien portaera ezagutzekoeredu egokirik ez daukatelako. Konkretuki, itsasgarri malguen erabilera joera bilakatuda industria mailan, eskaintzen dituzten abantailengatik, eta hori dela eta ahalegin handiakegiten ari dira eredu analitiko eraginkorragoak lortzeko. Erabilgarri dauden ereduak,itsasgarri zurrun konprimigarrietarako garatuak zainik, ez dira gai modulu elastiko baxua,konprimitzeko ezintasuna eta haustura arteko deformazio handiak jasaten dituztenitsasgarri malguen jarrera iragartzeko. Eredu analitiko garatuenek itsasgarriaren malgutasunarenefektua banaketa konstante bezala moduan agertzen dute, eta oraindik zehaztasunfalta dute, zurruntasunaren tentsio egoeraren efektuak, kaltearen eragina eta itsasgarriangertatzen diren deformazio handiak kontuan hartzen ez dituztelako.

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Części książek na temat "Micropolar Cohesive Damage Model"

Méïté, Mamadou, Noé Brice Nkoumbou Kaptchouang, Yann Monerie, Frédéric Perales i Pierre-Guy Vincent. "Ductile Crack Growth Using Cohesive GTN Model". W Handbook of Damage Mechanics, 1–20. New York, NY: Springer New York, 2021. http://dx.doi.org/10.1007/978-1-4614-8968-9_70-1.

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Méïté, Mamadou, Noé Brice Nkoumbou Kaptchouang, Yann Monerie, Frédéric Perales i Pierre-Guy Vincent. "Ductile Crack Growth Using Cohesive GTN Model". W Handbook of Damage Mechanics, 333–51. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-60242-0_70.

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Kabir, R., Alfred Cornec i Wolfgang Brocks. "Quasi-Brittle Fracture of Lamellar γTiAl: Simulation Using a Cohesive Model with Stochastic Approach". W Fracture and Damage Mechanics V, 1317–20. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.1317.

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Wang, Cheng Qiang, Zhong Hua Chen i Chang Liang Zheng. "Semi-Analytical Finite Element Method for Bilinear Cohesive Crack Model in Mode I Crack Propagation". W Fracture and Damage Mechanics V, 755–58. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.755.

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Lequesne, Cedric, A. Plumier, H. Degee i Anne Marie Habraken. "Numerical Study of the Fatigue Crack in Welded Beam-To-Column Connection Using Cohesive Zone Model". W Fracture and Damage Mechanics V, 847–50. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-413-8.847.

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Liu, Pengfei. "Cohesive/friction coupled model and implicit finite element analysis for delamination analysis of composite laminates under three-point bending". W Damage Modeling of Composite Structures, 145–73. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-820963-9.00005-5.

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Liu, Pengfei. "Viscoelastic bilinear cohesive model and parameter identification for failure analysis of adhesive composite joints using explicit finite element analysis". W Damage Modeling of Composite Structures, 175–90. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-820963-9.00004-3.

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Liu, Pengfei. "Numerical simulation of micromechanical crack initiation and propagation of thermoplastic composites using extended finite element analysis with embedded cohesive model". W Damage Modeling of Composite Structures, 329–56. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-820963-9.00009-2.

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Liu, Pengfei. "Viscoelastic cohesive/friction coupled model and explicit finite element analysis for delamination analysis of composite laminates under dynamic three-point bending". W Damage Modeling of Composite Structures, 191–218. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-12-820963-9.00007-9.

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Xu, T. Z. "Analysis for Cracking Progress of Concrete Dam Based on Double Scale Variables Damage-based Cohesive Crack Model". W Life-Cycle of Engineering Systems, 1111–16. CRC Press, 2016. http://dx.doi.org/10.1201/9781315375175-141.

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Streszczenia konferencji na temat "Micropolar Cohesive Damage Model"

Zhang, Yan, Jing-yu Fan i Johan Liu. "Multiscale delamination modeling of an anisotropic conductive adhesive interconnect based on micropolar theory and cohesive zone model". W High Density Packaging (ICEPT-HDP). IEEE, 2009. http://dx.doi.org/10.1109/icept.2009.5270771.

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Jha, Deepak K., i Anuradha Banerjee. "Cohesive Model in Prediction of Multi-Axial Fatigue". W ASME 2010 International Mechanical Engineering Congress and Exposition. ASMEDC, 2010. http://dx.doi.org/10.1115/imece2010-40353.

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A fatigue failure model for life assessment of a structure that incorporates the stress-state dependence and irreversible nature of fatigue damage is presented. In the frame work of cohesive zone model, a stress state dependent traction separation law for plane strain is taken to represent an undamaged ferritic steel. The evolution of damage has two additional fatigue parameters: a stress and a length parameter. Initially a parametric study is done to show that the model is able to reproduce a typical uniaxial fatigue response to stress based cyclic load, that of a stress-life curve and reduction in life due to positive mean stress. The effect of the cohesive fatigue parameters on the characteristics of the stress-life curve is then established. The model is further applied for a range of sinusoidally varying in-phase stress states which are characterised by a fixed bi-axiality ratio. The initiation and growth of damage is shown to be more rapid for higher bi-axiality. Except for stress amplitudes in which the lower bi-axiality case has conditions close to monotonic failure, the effect of bi-axiality is shown to be detrimental to the life expectancy of the material as observed in available experimental literature.

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Haj-Ali, Rami, Stephen Engelstad i Jared Walker. "Cohesive Micromechanical Model for Progressive Damage Analysis of Composite Materials and Structures". W 48th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-2282.

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Roy, Samit, Priyank Upadhyaya, Mohammad H. Haque i Hongbing Lu. "A Multi-Scale Viscoelastic Cohesive Layer Model for Predicting Delamination in HTPMC". W ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-36397.

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In this paper, a novel numerical-experimental methodology is outlined to predict delamination in pristine as well as isothermally aged (in air) polymer matrix composites. A rate-dependent viscoelastic cohesive layer model was implemented in an in-house test-bed finite element analysis (FEA) code to simulate the delamination initiation and propagation in unidirectional polymer composites before and after aging. This unified model is fully rate-dependent and does not require a pre-assigned traction-separation law. The actual shape of traction separation law depends on: (a) the strain rate via the viscoelastic constitutive relationship, (b) the degree of thermo-oxidative aging via the changes in the experimentally measured creep compliance due to oxidation, and (c) the evolution of the internal state variable defining the state of damage. To determine the model parameters, double cantilever beam (DCB) experiments were conducted on both pristine and isothermally aged IM-7/bismaleimide (BMI) composite specimens. The J-Integral approach was adapted to extract cohesive stresses near the crack tip. A principal-stretch dependent internal damage state variable defines the damage in the cohesive layer. Within the cohesive layer, pristine and cohesive stresses were compared to estimate the damage parameters. Once the damage parameters had been characterized, the test-bed FEA code employed a micromechanics based viscoelastic cohesive layer model to simulate interlaminar delamination. From a numerical stability standpoint, the viscous regularization effect of the viscoelastic constitutive equations in the cohesive layer helps mitigate numerical instabilities caused by elastic energy released due to crack growth, thereby enabling the FEA model to simulate the load-deflection response of the composite structure well beyond peak load. The present cohesive-layer based FEA model was able to accurately predict not only the macro level load-displacement curve, but also the micro level crack growth history in IM-7/BMI laminate before and after thermal aging, using only three parameters.

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Yang, B., i S. Mall. "Investigation of Damage in Unidirectional Ceramic Matrix Composites Using a Cohesive-Shear-Lag Model". W ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/ad-25300.

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Abstract The present study develops a cohesive-shear-lag model to analyze the cycling stress-strain behavior of unidirectional fiber-reinforced ceramic matrix composites. The model, as a modification to a classical shear-lag model, takes into account matrix cracking, partial interfacial debonding, and partial breakage of fibers. The statistical nature of partial breakage of fibers is modeled by using a cohesive force law. The validity of the model is demonstrated by investigating stress-strain hysteresis loops of a unidirectional fiber-reinforced ceramic-glass matrix composite, SiC/1723. This example demonstrates the capability of the proposed model to characterize damage and deformation mechanisms of ceramic matrix composites under tension-tension cycling loading. The dominant progressive damage mechanism with cycling in this case is shown to be accumulation of fibers breakage, accompanied by increase in interfacial debonding and smoothening of frictional debonded interface.

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Altammar, Hussain, Sudhir Kaul i Anoop Dhingra. "Thermo-Mechanical Analysis of Mixed-Mode Damage: Cohesive Zone Modeling". W ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-46057.

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Damage detection and diagnostics is a key area of research in structural analysis. This paper presents results from the analysis of mixed-mode damage initiation in a composite beam under thermal and mechanical loads. A finite element model in conjunction with a cohesive zone model (CZM) is used in order to determine the location of joint separation as well as the contribution of each mode in damage (debonding) initiation. The composite beam is modeled by using two layers of aluminum that are bonded together through a layer of adhesive. Simulation results show that the model can successfully detect the location of damage under a thermo-mechanical load. The model can also be used to determine the severity of damage due to a thermal load, a mechanical load and a thermo-mechanical load. It is observed that integrating thermal analysis has a significant influence on the fracture energy.

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Jing, Jianping, Feng Gao, Janine Johnson, Frank Z. Liang, Richard L. Williams i Jianmin Qu. "Simulation of Dynamic Fracture Along Solder-Pad Interfaces Using a Cohesive Zone Model". W ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-68891.

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In this paper, dynamic fracture of a single solder joint specimen is numerically simulated using the finite element method. The solder-IMC and IMC-Cu pad interfaces are modeled as cohesive zones. The simulated results show that under pure tensile loading, damage typically starts at the edge of the solder-IMC interface, then moves to IMC-Cu pad interface. Eventual failure is typically a brittle interfacial failure of the IMC-Cu interface.

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Truong, Do Van. "Simulation of Crack Initiation at the Interface Edge Between Sub-Micron Thick Films Under Creep by Cohesive Zone Model". W ASME 2008 International Manufacturing Science and Engineering Conference collocated with the 3rd JSME/ASME International Conference on Materials and Processing. ASMEDC, 2008. http://dx.doi.org/10.1115/msec_icmp2008-72061.

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Delamination between sub-micron thick films is initiated at an interface edge due to creep deformation, and leads to the malfunction of microelectronic devices. In this study, the cohesive zone model approach with a cohesive law based on damage mechanics was developed to simulate crack initiation process at an interface edge between film layers under creep. Delamination experiments using a micro-cantilever bend specimen with a Sn/Si interface were conducted. The parameters charactering the cohesive law were calibrated by fitting displacement-time curves obtained by experiments and simulations. In addition, the order of the stress singularity, which increases with time and has a significant jump in its value at the crack initiation, was investigated.

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Hopkins, Caroline G., Peter E. McHugh i J. Patrick McGarry. "Computer Modeling of Cardiovascular Stent Coating Damage". W ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192880.

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In this paper computational simulations of stent coating debonding are presented. Finite element methods are implemented to model coating delamination during stent crimping, deployment and recoil. Gold, titanium and polymer coatings of differing thicknesses are explicitly modeled. The interfacial relationship between the stent surface and the coating during crimping and deployment is simulated using a cohesive zone model.

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Gonzalez, M., A. Dahi Taleghani i J. E. Olson. "A Cohesive Model for Modeling Hydraulic Fractures in Naturally Fractured Formations". W SPE Hydraulic Fracturing Technology Conference. SPE, 2015. http://dx.doi.org/10.2118/spe-173384-ms.

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Abstract A cohesive zone model (CZM) has been developed to couple fluid flow with elastic, plastic and damage behavior of rock during hydraulic fracturing in naturally fractured formations. In addition to inelastic deformations, this model incorporates rock anisotropies. Fracture mechanics of microcrack and micro-void nucleation and their coalescence are incorporated into the formulation of the CZM models to accurately capture different failure modes of rocks. The performance of the developed elastoplastic and CZM models are compared with the available data of a shale play, and then the models are introduced into a commercial finite element package through user-defined subroutines. A workflow to derive the required model parameters for both intact rock and cemented natural fractures is presented through inverse modeling of field data. The hydraulic fractures' growth in the reservoir scale is then simulated, in which the effect of fluid viscosity, natural fracture characteristics and differential stresses on induced fracture network is studied. The simulation results are compared with the available solutions in the literature. The developed CZM model outperforms the traditional fracture mechanics approaches by removing stress singularities at the fracture tips, and simulation of progressive fractures without any essential need for remeshing. This model would provide a robust tool for modeling hydraulic fracture growth using conventional elements of FEA.

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