COD and CSD based model for in-plane stiffness of symmetric laminates with cracks in plies and local delaminations: Analysis of crack face sliding

IF 8.1 2区材料科学 Q1 ENGINEERING, MANUFACTURING Composites Part A: Applied Science and Manufacturing Pub Date : 2024-11-16 DOI:10.1016/j.compositesa.2024.108594

Janis Varna , Rodrigo T.S. Freire , Mohamed Sahbi Loukil , Nawres J. Al-Ramahi

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Abstract

In-plane thermo-elastic constants of symmetric damaged laminates containing transverse cracks in plies and local delaminations starting from crack tip are predicted using a crack opening (COD) and crack sliding displacement (CSD) based approach. An exact elastic analysis shows that the displacement gap on the delamination crack surfaces does not enter the stiffness expressions explicitly. The delamination affects the stiffness via larger COD and CSD of the intralaminar crack. This means that the same expressions for cracked laminates with and without delaminations can be used but with different expressions for COD and CSD. Finite element method is used to analyze the CSD dependence on delamination length and crack density. The obtained approximative expressions for CSD are in a good agreement with FEM. It is shown that in cases when it depends on CSD only, the predicted shear modulus of laminates is in an excellent agreement with direct FEM calculations. The used homogenization over couples of off-axis plies (monoclinic materials) in CSD expressions for balanced laminates is validated.

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基于COD和CSD的层合板局部分层裂纹面内刚度模型：裂纹面滑动分析

采用基于裂纹开度（COD）和裂纹滑动位移（CSD）的方法，预测了含有横向裂纹和从裂纹尖端开始的局部分层的对称损伤层合板的面内热弹性常数。精确的弹性分析表明，分层裂纹表面的位移间隙不显式地进入刚度表达式。分层通过层内裂纹较大的COD和CSD影响刚度。这意味着有和没有分层的裂纹层合板可以使用相同的表达式，但COD和CSD的表达式不同。采用有限元方法分析了裂纹强度随分层长度和裂纹密度的变化规律。所得的CSD近似表达式与有限元分析结果吻合较好。结果表明，在仅依赖CSD的情况下，层合板剪切模量的预测值与直接有限元计算值非常吻合。在平衡层压板的CSD表达式中，对离轴层对（单斜材料）使用的均匀化方法进行了验证。

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来源期刊

Composites Part A: Applied Science and Manufacturing 工程技术-材料科学：复合

CiteScore

15.20

自引率

5.70%

发文量

492

审稿时长

30 days

期刊介绍： Composites Part A: Applied Science and Manufacturing is a comprehensive journal that publishes original research papers, review articles, case studies, short communications, and letters covering various aspects of composite materials science and technology. This includes fibrous and particulate reinforcements in polymeric, metallic, and ceramic matrices, as well as 'natural' composites like wood and biological materials. The journal addresses topics such as properties, design, and manufacture of reinforcing fibers and particles, novel architectures and concepts, multifunctional composites, advancements in fabrication and processing, manufacturing science, process modeling, experimental mechanics, microstructural characterization, interfaces, prediction and measurement of mechanical, physical, and chemical behavior, and performance in service. Additionally, articles on economic and commercial aspects, design, and case studies are welcomed. All submissions undergo rigorous peer review to ensure they contribute significantly and innovatively, maintaining high standards for content and presentation. The editorial team aims to expedite the review process for prompt publication.