Pub Date : 2021-09-01DOI: 10.23967/composites.2021.068
C. González
{"title":"A Data-Reduction Method for Intralaminar Cohesive Properties Using a Bayesian Approach","authors":"C. González","doi":"10.23967/composites.2021.068","DOIUrl":"https://doi.org/10.23967/composites.2021.068","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127798455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-01DOI: 10.23967/composites.2021.027
J. Selvaraj, L. Kawashita, A. Melro, S. Hallett
{"title":"Damage Modelling in Sublaminate Scale with Higuer Order Elements in Explicit Dynamics","authors":"J. Selvaraj, L. Kawashita, A. Melro, S. Hallett","doi":"10.23967/composites.2021.027","DOIUrl":"https://doi.org/10.23967/composites.2021.027","url":null,"abstract":"","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129903787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/composites.2021.060
N. Al-Ramahi, R. Joffe, J. Varna
The study outlined here is related to the prediction of crack propagation path in the adhesive layer of joints. Typically crack initiation is predicted from stress analysis while fracture mechanics deals with propagation [1]. The fracture mechanics for complex stress states does not have an analytical solutions and numerical simulation should be employed. Besides, the crack propagation occurs in small increments with changing directions and more than one numerical simulation may be needed for each step and fracture toughness in a form of critical Energy Release Rate (ERR) for different propagation modes is needed as input. Thus, the procedure becomes rather time and resource consuming. The current paper offers alternative methodology which is based on the analysis of stress state ahead of existing crack to predict direction of the crack growth. The double cantilever beam with similar/dissimilar materials and adhesive layer in-between them is chosen as an example and the stress analysis is performed by means of finite element method. It is shown that crack path may be predicted based on the maximum peel (hoop) stress found on the circle of fixed radius around the crack tip. The crack extension is modeled in incremental manner with step-by-step procedure. Only two increments from the initial crack in the adhesive layer are considered. The angle θ 1 between the pre-crack and maximum value of the peel stress defines direction for the first crack increment. The direction for the second increment is defined by angle θ 2 with respect to the first increment. Thus, two angles are identified: θ 1 - deviation from the horizontal pre-crack; θ 2 - second increment (see Figure 1a). The results are verified by traditional fracture mechanics approach to calculate work needed to close the crack increment (see Figure 1b).
{"title":"Numerical Stress Analysis for Prediction of Crack Propagation Direction in Adhesive Layer","authors":"N. Al-Ramahi, R. Joffe, J. Varna","doi":"10.23967/composites.2021.060","DOIUrl":"https://doi.org/10.23967/composites.2021.060","url":null,"abstract":"The study outlined here is related to the prediction of crack propagation path in the adhesive layer of joints. Typically crack initiation is predicted from stress analysis while fracture mechanics deals with propagation [1]. The fracture mechanics for complex stress states does not have an analytical solutions and numerical simulation should be employed. Besides, the crack propagation occurs in small increments with changing directions and more than one numerical simulation may be needed for each step and fracture toughness in a form of critical Energy Release Rate (ERR) for different propagation modes is needed as input. Thus, the procedure becomes rather time and resource consuming. The current paper offers alternative methodology which is based on the analysis of stress state ahead of existing crack to predict direction of the crack growth. The double cantilever beam with similar/dissimilar materials and adhesive layer in-between them is chosen as an example and the stress analysis is performed by means of finite element method. It is shown that crack path may be predicted based on the maximum peel (hoop) stress found on the circle of fixed radius around the crack tip. The crack extension is modeled in incremental manner with step-by-step procedure. Only two increments from the initial crack in the adhesive layer are considered. The angle θ 1 between the pre-crack and maximum value of the peel stress defines direction for the first crack increment. The direction for the second increment is defined by angle θ 2 with respect to the first increment. Thus, two angles are identified: θ 1 - deviation from the horizontal pre-crack; θ 2 - second increment (see Figure 1a). The results are verified by traditional fracture mechanics approach to calculate work needed to close the crack increment (see Figure 1b).","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116910880","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/composites.2021.097
Bernardo P. Ferreira, F. A. Pires, M. Bessa
of material representative volume
材料代表体积
{"title":"An Adaptive Approach to Tackle Localization Phenomena in Clustering-Based Reduced Order Models","authors":"Bernardo P. Ferreira, F. A. Pires, M. Bessa","doi":"10.23967/composites.2021.097","DOIUrl":"https://doi.org/10.23967/composites.2021.097","url":null,"abstract":"of material representative volume","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127198877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/composites.2021.004
M. Rubino, Y. Wielhorski, J. Schneider, A. Mendoza, S. Roux
The objective of the present study is to propose an automatic method for aligning the distortions of yarn layers in a 3D woven textile. The analysis is carried on the tomographic image of the preform molded to its final shape. A suited Gaussian filter erases either the warp or the weft structure so as to obtain a stratified structure, which is mapped onto a perfect fabric geometry characterized by a constant spacing of the yarn planes, as it would have been ideally produced just out of the loom. The registration procedure is conducted in the spirit of Digital Volume Correlation (DVC). The “ideal image” may be constructed with different levels of sophistication that incorporate more or less information about yarns, and their spacing. The registration of the image with its ideal model is thus coined model-based correlation method (MDIC). It allows a more faithful description of the effect of moving two yarn plane closer or farther apart, which for tomography violates the usual conservation of gray levels. The algorithm adjusts each yarn surface along the mean surface normal and is discretized along a regular grid whose step correspond to the typical yarn spacing. Thus the problem reduces to a set of one-dimensional image correlation problems, that make the numerical resolution quite fast. The identity of the single yarn surfaces is accounted for in the model image, as each parallel yarn plane is modeled as having a Gaussian profile
{"title":"Mapping 3D Textiles onto their Models","authors":"M. Rubino, Y. Wielhorski, J. Schneider, A. Mendoza, S. Roux","doi":"10.23967/composites.2021.004","DOIUrl":"https://doi.org/10.23967/composites.2021.004","url":null,"abstract":"The objective of the present study is to propose an automatic method for aligning the distortions of yarn layers in a 3D woven textile. The analysis is carried on the tomographic image of the preform molded to its final shape. A suited Gaussian filter erases either the warp or the weft structure so as to obtain a stratified structure, which is mapped onto a perfect fabric geometry characterized by a constant spacing of the yarn planes, as it would have been ideally produced just out of the loom. The registration procedure is conducted in the spirit of Digital Volume Correlation (DVC). The “ideal image” may be constructed with different levels of sophistication that incorporate more or less information about yarns, and their spacing. The registration of the image with its ideal model is thus coined model-based correlation method (MDIC). It allows a more faithful description of the effect of moving two yarn plane closer or farther apart, which for tomography violates the usual conservation of gray levels. The algorithm adjusts each yarn surface along the mean surface normal and is discretized along a regular grid whose step correspond to the typical yarn spacing. Thus the problem reduces to a set of one-dimensional image correlation problems, that make the numerical resolution quite fast. The identity of the single yarn surfaces is accounted for in the model image, as each parallel yarn plane is modeled as having a Gaussian profile","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116755876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/composites.2021.006
F. Hamzah, N. Wirawan, F. Cepero, J. Curiel-Sosa
In the past few decades, interlaminar and intralaminar damage interaction on composite laminates has been extensively investigated in order to predict failure. It is widely known that predictive modelling of composite structures failure -specifically during the manufacturing stagecould significantly reduce the production cost and time. In many cases, delamination is the main threat leading to failure. Despite having an enormous amount of research via both numerical and experimental, comparison between different techniques for predictive modelling of delamination initiation and propagation results in significant discrepancies [1].
{"title":"Comparison of Computational Techniques for Prediction of Delamination Initiation and Propagation in Composite Laminates","authors":"F. Hamzah, N. Wirawan, F. Cepero, J. Curiel-Sosa","doi":"10.23967/composites.2021.006","DOIUrl":"https://doi.org/10.23967/composites.2021.006","url":null,"abstract":"In the past few decades, interlaminar and intralaminar damage interaction on composite laminates has been extensively investigated in order to predict failure. It is widely known that predictive modelling of composite structures failure -specifically during the manufacturing stagecould significantly reduce the production cost and time. In many cases, delamination is the main threat leading to failure. Despite having an enormous amount of research via both numerical and experimental, comparison between different techniques for predictive modelling of delamination initiation and propagation results in significant discrepancies [1].","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130349761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/composites.2021.037
J. Bender, B. Bak, L. Carreras, E. Lindgaard
Intralaminar crack growth rates of interacting cracks related to individual energy release rates . Abstract from 8th ECCOMAS Thematic Conference on the Mechanical Response of Composites
{"title":"Intralaminar Crack Growth Rates of Interacting Cracks Related to Individual Energy Release Rates","authors":"J. Bender, B. Bak, L. Carreras, E. Lindgaard","doi":"10.23967/composites.2021.037","DOIUrl":"https://doi.org/10.23967/composites.2021.037","url":null,"abstract":"Intralaminar crack growth rates of interacting cracks related to individual energy release rates . Abstract from 8th ECCOMAS Thematic Conference on the Mechanical Response of Composites","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121395245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/composites.2021.115
D. Garoz, M. Flores, D. Mollenhauer, C. González
The sub-ply failure mechanism of a fibre-reinforced composite laminate is the key to understand and prevent the failure of composite structures under compressive loads. Fibre-matrix debonding and matrix cracking occur in the sub-ply failure mechanism when the load is transverse to the fibres. These two damage modes trigger a stochastic damage progression through the ply. The sub-ply failure mechanism of unidirectional carbon fibre composites has been studied using finite element simulations for the case of a micro-pillar specimen under compression load. The dimensions and the volume fraction determine the geometry of the micro-pillar. The model describes the sub-ply failure under the specified compression load based on the mechanical properties of the constituents, fibre and matrix as well as their interface. Then, the stochastic behaviour of the failure mechanism has been investigated considering different random geometries, the variability of the mechanical properties, and heterogeneous distributions of defects. Figure 1 shows the final failure of two different micro-pillar geometries keeping the volume fraction and material properties. Although the failure patterns are different, the stress-strain curves show a general behaviour with a limited dispersion of the maximum strength. As a preliminary conclusion, the proposed model can determine the dispersion of the relevant mechanical properties for the sub-ply failure under compression considering different sources that affect the failures mechanism. Finally, the simulated sub-ply failures are compared to dedicated experiments of micro-pillars performed under a SEM microscope.
{"title":"Stochastic Behaviour in Sub-Ply Failure Mechanism of Unidirectional Carbon Fiber Composites","authors":"D. Garoz, M. Flores, D. Mollenhauer, C. González","doi":"10.23967/composites.2021.115","DOIUrl":"https://doi.org/10.23967/composites.2021.115","url":null,"abstract":"The sub-ply failure mechanism of a fibre-reinforced composite laminate is the key to understand and prevent the failure of composite structures under compressive loads. Fibre-matrix debonding and matrix cracking occur in the sub-ply failure mechanism when the load is transverse to the fibres. These two damage modes trigger a stochastic damage progression through the ply. The sub-ply failure mechanism of unidirectional carbon fibre composites has been studied using finite element simulations for the case of a micro-pillar specimen under compression load. The dimensions and the volume fraction determine the geometry of the micro-pillar. The model describes the sub-ply failure under the specified compression load based on the mechanical properties of the constituents, fibre and matrix as well as their interface. Then, the stochastic behaviour of the failure mechanism has been investigated considering different random geometries, the variability of the mechanical properties, and heterogeneous distributions of defects. Figure 1 shows the final failure of two different micro-pillar geometries keeping the volume fraction and material properties. Although the failure patterns are different, the stress-strain curves show a general behaviour with a limited dispersion of the maximum strength. As a preliminary conclusion, the proposed model can determine the dispersion of the relevant mechanical properties for the sub-ply failure under compression considering different sources that affect the failures mechanism. Finally, the simulated sub-ply failures are compared to dedicated experiments of micro-pillars performed under a SEM microscope.","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121646096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/composites.2021.025
G. Bellezza, G. Couégnat, M. Ricchiuto, G. Vignoles
This work investigates the structural evolution and the failure of a self-healing ceramic matrix mini-composite [1] under static fatigue tests in oxidizing environment. The investigation is based on a two-dimensional image-based model of a transverse crack and the description of the related diffusive-reactive phenomena [2]. In particular, the ingress of oxygen and the combined effect of oxidation and production of a sealing liquid oxide are taken into account. A slow crack growth model [3] is used to predict the fibres progressive degradation with respect to the on environmental parameters, especially the oxygen concentration, considering its extreme variation trough the crack. Tow failure depends on the statistical fibres initial strength, slow crack growth kinetic, and load transfer following fibres breakage, which is captured thanks to an approximate mechanical model. This approach has been applied to a virtual material consisting of Hi-Nicalon fibres immersed in an SiC / B 4 C matrix coating. Effects of temperature, spatial variation of the statistical distribution of fibres strength and applied load were examined in terms of material behaviour and lifetime prediction. The results prove the fundamental impact of the diffusion/reaction processes (healing) on the fibre breakage scenarios, highlighting the need to model these processes appropriately. Besides, we show that the materials lifetime has great sensitivity to the distribution of weak fibres and of their relative positions in the yarn.
{"title":"A Two-dimensional Numerical Strategy for Computing Self-healing Ceramic Matrix Composites Lifetime","authors":"G. Bellezza, G. Couégnat, M. Ricchiuto, G. Vignoles","doi":"10.23967/composites.2021.025","DOIUrl":"https://doi.org/10.23967/composites.2021.025","url":null,"abstract":"This work investigates the structural evolution and the failure of a self-healing ceramic matrix mini-composite [1] under static fatigue tests in oxidizing environment. The investigation is based on a two-dimensional image-based model of a transverse crack and the description of the related diffusive-reactive phenomena [2]. In particular, the ingress of oxygen and the combined effect of oxidation and production of a sealing liquid oxide are taken into account. A slow crack growth model [3] is used to predict the fibres progressive degradation with respect to the on environmental parameters, especially the oxygen concentration, considering its extreme variation trough the crack. Tow failure depends on the statistical fibres initial strength, slow crack growth kinetic, and load transfer following fibres breakage, which is captured thanks to an approximate mechanical model. This approach has been applied to a virtual material consisting of Hi-Nicalon fibres immersed in an SiC / B 4 C matrix coating. Effects of temperature, spatial variation of the statistical distribution of fibres strength and applied load were examined in terms of material behaviour and lifetime prediction. The results prove the fundamental impact of the diffusion/reaction processes (healing) on the fibre breakage scenarios, highlighting the need to model these processes appropriately. Besides, we show that the materials lifetime has great sensitivity to the distribution of weak fibres and of their relative positions in the yarn.","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130286247","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1900-01-01DOI: 10.23967/composites.2021.023
L. D. Gennaro, F. Daghia, M. Olive, F. Jacquemin, D. Espinassou
L. Di Gennaro, F. Daghia, M. Olive, F. Jacquemin and D. Espinassou 1 Université Paris-Saclay, ENS Paris-Saclay, CNRS, LMT Laboratoire de Mécanique et Technologie, 4 avenue des Sciences, 91190, Gif-sur-Yvette, France. 2 Institut de Recherche en Génie Civil et Mécanique (GeM) – UMR CNRS 6183, 58 Rue Michel Ange, 44600 Saint Nazaire, France. 3 CETIM, Technocampus Composites Chemin du Chaffault, 44340 Bouguenais, France. ∗ livio.di gennaro@ens-paris-saclay.fr
l·根纳迪·f, f Daghia Olive先生,笔者and d . 1 Espinassou Paris-Saclay ENS Paris-Saclay、中国科学院大学、机械和技术指导他们实验室4大道、91190 yvette,法国科学院。2名土木和机械研究所(GeM)—UMR CNRS 6183 Nazaire 44600 Saint Michel天使街、58、法国第三。3中心、复合Technocampus Chaffault途中44340 Bouguenais、法国。∗livio)。di gennaro@ens-paris-saclay.fr
{"title":"A Mechanism-based Thermo-Viscoelastic Constitutive Law for Fiber Reinforced Polymer Matrix Composites","authors":"L. D. Gennaro, F. Daghia, M. Olive, F. Jacquemin, D. Espinassou","doi":"10.23967/composites.2021.023","DOIUrl":"https://doi.org/10.23967/composites.2021.023","url":null,"abstract":"L. Di Gennaro, F. Daghia, M. Olive, F. Jacquemin and D. Espinassou 1 Université Paris-Saclay, ENS Paris-Saclay, CNRS, LMT Laboratoire de Mécanique et Technologie, 4 avenue des Sciences, 91190, Gif-sur-Yvette, France. 2 Institut de Recherche en Génie Civil et Mécanique (GeM) – UMR CNRS 6183, 58 Rue Michel Ange, 44600 Saint Nazaire, France. 3 CETIM, Technocampus Composites Chemin du Chaffault, 44340 Bouguenais, France. ∗ livio.di gennaro@ens-paris-saclay.fr","PeriodicalId":392595,"journal":{"name":"VIII Conference on Mechanical Response of Composites","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125242487","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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