Face/core disbond fatigue growth in honeycomb cored aircraft sandwich elements under mixed mode flatwise tension loading

IF 3.5 3区材料科学 Q1 ENGINEERING, MECHANICAL

Journal of Sandwich Structures & Materials Pub Date : 2022-07-16 DOI:10.1177/10996362221115420

Arash Farshidi, C. Berggreen

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引用次数: 2

Abstract

Disbond damage growth in honeycomb cored sandwich structures due to static and fatigue mixed mode loading is investigated numerically and experimentally. A two dimensional finite element model was generated using core homogenization and the Crack Surface Displacement Extrapolation mode separation method, integrated into a fracture mechanics based analysis sub-routine to predict face/core interface fatigue crack propagation. The Cycle Jump technique was furthermore applied to accelerate fatigue analysis. Mixed mode fatigue characterization testing was conducted using Double Cantilever Beam specimens loaded with Uneven Bending Moments, generating a relationship between crack propagation rates and energy release rate amplitudes as a modified Paris Law, measured at three mode-mixity phase angles. The measured Paris laws were subsequently used as input data for the numerical fatigue model. The numerical model was validated against CFRP/Nomex® Sandwich Tearing Test specimen tests with a propagating face/core interface crack yielding varying mode-mixities. The results from the validation showed good agreement between numerical predictions and experimental measurements.

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混合模态平面拉伸载荷下蜂窝芯飞机夹层构件面/芯剥离疲劳增长

采用数值和实验方法研究了蜂窝芯夹层结构在静态和疲劳混合载荷作用下的脱粘损伤增长。采用岩心均质化和裂纹表面位移外推模式分离方法建立二维有限元模型，并将其集成到基于断裂力学的分析子程序中，预测岩心/工作面界面疲劳裂纹扩展。进一步应用循环跳变技术加速疲劳分析。采用加载不均匀弯矩的双悬臂梁试件进行混合模态疲劳表征试验，得到了裂纹扩展速率与能量释放速率幅值之间的关系，即在三个模态-混合相角下测量的修正Paris定律。实测的巴黎定律随后被用作数值疲劳模型的输入数据。数值模型通过CFRP/Nomex®三明治撕裂试验验证，该试验具有扩展的面/芯界面裂纹，产生不同的模式混合物。验证结果表明，数值预测与实验测量结果吻合较好。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Sandwich Structures & Materials 工程技术-材料科学：表征与测试

CiteScore

9.60

自引率

2.60%

发文量

审稿时长

7 months

期刊介绍： The Journal of Sandwich Structures and Materials is an international peer reviewed journal that provides a means of communication to fellow engineers and scientists by providing an archival record of developments in the science, technology, and professional practices of sandwich construction throughout the world. This journal is a member of the Committee on Publication Ethics (COPE).