二维三轴编织复合材料压缩失效行为的细观有限元模拟

doi:10.7527/S1000-6893.2019.22865

固体力学与飞行器总体设计

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二维三轴编织复合材料压缩失效行为的细观有限元模拟

刘鹏^1,2, 郭亚洲^1,2, 赵振强^1,2, 邢军^1,3, 张超^1,2

1. 西北工业大学航空学院, 西安 710072;
2. 西北工业大学陕西省冲击动力学及工程应用重点实验室, 西安 710072;
3. 中国民用航空适航审定中心, 北京 100102

收稿日期:2018-12-21 修回日期:2019-01-15 出版日期:2019-07-15 发布日期:2019-04-01
通讯作者: 张超 E-mail:chaozhang@nwpu.edu.cn
基金资助:
国家自然科学基金（11772267）

Meso-scale finite element simulation of compressive failure behavior of two-dimensional triaxially braided composite

LIU Peng^1,2, GUO Yazhou^1,2, ZHAO Zhenqiang^1,2, XING Jun^1,3, ZHANG Chao^1,2

1. School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China;
2. Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Applications, Northwestern Polytechnical University, Xi'an 710072, China;
3. Airworthiness Certification Center, Civil Aviation Administration of China, Beijing 100102, China

Received:2018-12-21 Revised:2019-01-15 Online:2019-07-15 Published:2019-04-01
Supported by:
National Natural Science Foundation of China (11772267)

摘要/Abstract

摘要： 为研究典型二维三轴编织复合材料（2DTBC）的压缩破坏机理，建立了细观有限元模拟方法体系。提出了反映编织复合材料真实几何特性的单胞模型建模策略，根据Murakami-Ohno损伤理论建立了各向异性损伤模型来模拟纤维束中的损伤起始和扩展行为，通过引入波动系数描述了纤维束的起伏状态，并采用内聚力单元来模拟界面分层。在此基础上，分析得到了二维三轴编织复合材料在压缩载荷下的破坏过程，研究了压缩载荷下纤维束和界面层的损伤演化，探讨了纤维束波动对压缩性能的影响规律。通过与相关试验结果对比，该模型能够准确预测二维三轴编织复合材料在面内压缩载荷下的力学响应和主要失效行为，以及自由边效应。细观失效过程分析结果表明，二维三轴编织复合材料轴向压缩的破坏是由轴向纤维束的纤维压缩失效主导的；横向压缩破坏则是由偏轴纤维束的纤维压缩失效引起的。

关键词: 二维三轴编织复合材料, 有限元方法, 细观尺度, 纤维束波动, 压缩强度, 渐进损伤行为

Abstract: A meso-scale finite element model is developed to predict the progressive damage behavior of the two-Dimensional Triaxially Braided Composite (2DTBC) subjected to compressive loading conditions. A unit cell model that reflects the realistic geometrical properties of the braided composite is established. Based on Murakami-Ohno damage theory, an anisotropic damage model is established to simulate the damage initiation and the propagation process in fiber bundles. Undulation coefficient is introduced to describe the extent of undulation. The interfaces are simulated using the cohesive element model. The compressive damage process of 2DTBC is systematically illustrated and analyzed using the meso-scale finite element model, with special focus on the damage evolution process of fiber bundles and interfaces, and the effect of fiber bundle undulation on the effective compressive properties. The proposed model shows excellent correlation with the experimental results, not only capturing the global stress-strain responses, but also capturing the progressive damage behavior and the free-edge effect of the composite. The results indicate that the axial compression failure of the 2DTBC is dominated by the fiber-compression failure of axial fiber bundles, and the transverse compression failure is caused by the fiber-compression failure of bias fiber bundles.

Key words: two-dimensional triaxially braided composite, finite element method, meso-scale, fiber bundle undulation, compressive strength, progressive damage behavior

中图分类号:

V258⁺.3

刘鹏, 郭亚洲, 赵振强, 邢军, 张超. 二维三轴编织复合材料压缩失效行为的细观有限元模拟[J]. 航空学报, 2019, 40(7): 222865-222865.

LIU Peng, GUO Yazhou, ZHAO Zhenqiang, XING Jun, ZHANG Chao. Meso-scale finite element simulation of compressive failure behavior of two-dimensional triaxially braided composite[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019, 40(7): 222865-222865.

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E-mail：hkxb@buaa.edu.cn

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二维三轴编织复合材料压缩失效行为的细观有限元模拟

Meso-scale finite element simulation of compressive failure behavior of two-dimensional triaxially braided composite

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