VIII Conference on Mechanical Response of Composites最新文献_第5页

A Data-Reduction Method for Intralaminar Cohesive Properties Using a Bayesian Approach 基于贝叶斯方法的层间内聚特性数据约简方法

VIII Conference on Mechanical Response of Composites Pub Date : 2021-09-01 DOI: 10.23967/composites.2021.068

C. González

引用次数: 0

Damage Modelling in Sublaminate Scale with Higuer Order Elements in Explicit Dynamics 显式动力学中高阶元亚层次尺度损伤建模

VIII Conference on Mechanical Response of Composites Pub Date : 2021-09-01 DOI: 10.23967/composites.2021.027

J. Selvaraj, L. Kawashita, A. Melro, S. Hallett

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Numerical Stress Analysis for Prediction of Crack Propagation Direction in Adhesive Layer 粘接层裂纹扩展方向预测的数值应力分析

VIII Conference on Mechanical Response of Composites Pub Date : 1900-01-01 DOI: 10.23967/composites.2021.060

N. Al-Ramahi, R. Joffe, J. Varna

{"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}

引用次数: 0

An Adaptive Approach to Tackle Localization Phenomena in Clustering-Based Reduced Order Models 基于聚类的降阶模型中定位现象的自适应处理方法

VIII Conference on Mechanical Response of Composites Pub Date : 1900-01-01 DOI: 10.23967/composites.2021.097

Bernardo P. Ferreira, F. A. Pires, M. Bessa

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Mapping 3D Textiles onto their Models 将3D纺织品映射到模型上

VIII Conference on Mechanical Response of Composites Pub Date : 1900-01-01 DOI: 10.23967/composites.2021.004

M. Rubino, Y. Wielhorski, J. Schneider, A. Mendoza, S. Roux

{"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}

引用次数: 0

Comparison of Computational Techniques for Prediction of Delamination Initiation and Propagation in Composite Laminates 复合材料层合板脱层萌生和扩展预测计算技术的比较

VIII Conference on Mechanical Response of Composites Pub Date : 1900-01-01 DOI: 10.23967/composites.2021.006

F. Hamzah, N. Wirawan, F. Cepero, J. Curiel-Sosa

引用次数: 0

Intralaminar Crack Growth Rates of Interacting Cracks Related to Individual Energy Release Rates 相互作用裂纹的层内裂纹扩展速率与个体能量释放速率的关系

VIII Conference on Mechanical Response of Composites Pub Date : 1900-01-01 DOI: 10.23967/composites.2021.037

J. Bender, B. Bak, L. Carreras, E. Lindgaard

引用次数: 0

Stochastic Behaviour in Sub-Ply Failure Mechanism of Unidirectional Carbon Fiber Composites 单向碳纤维复合材料亚层破坏机制中的随机行为

VIII Conference on Mechanical Response of Composites Pub Date : 1900-01-01 DOI: 10.23967/composites.2021.115

D. Garoz, M. Flores, D. Mollenhauer, C. González

{"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}

引用次数: 0

A Two-dimensional Numerical Strategy for Computing Self-healing Ceramic Matrix Composites Lifetime 自修复陶瓷基复合材料寿命的二维数值计算策略

VIII Conference on Mechanical Response of Composites Pub Date : 1900-01-01 DOI: 10.23967/composites.2021.025

G. Bellezza, G. Couégnat, M. Ricchiuto, G. Vignoles

{"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}

引用次数: 0

A Mechanism-based Thermo-Viscoelastic Constitutive Law for Fiber Reinforced Polymer Matrix Composites 基于机理的纤维增强聚合物基复合材料热粘弹性本构律

VIII Conference on Mechanical Response of Composites Pub Date : 1900-01-01 DOI: 10.23967/composites.2021.023

L. D. Gennaro, F. Daghia, M. Olive, F. Jacquemin, D. Espinassou

引用次数: 0