缝合式C/SiC复合材料非线性本构关系及断裂行为研究

曹明月; 张启; 吴建国; 葛敬冉; 梁军

doi:10.6052/0459-1879-20-058

缝合式C/SiC复合材料非线性本构关系及断裂行为研究

doi: 10.6052/0459-1879-20-058

曹明月^*,,
张启^*,
吴建国^†,
葛敬冉^*2),,
梁军^*3),

^*北京理工大学先进结构技术研究院, 北京 100081
^†北京强度环境研究所可靠性与环境工程技术重点实验室, 北京 100076

基金项目: 1)国家自然科学基金(11802018);国家自然科学基金(111732002)

详细信息

通讯作者:
葛敬冉

葛敬冉,梁军

中图分类号: O346.1
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-25
- 刊出日期: 2020-08-10

STUDY ON NONLINEAR CONSTITUTIVE RELATIONSHIP AND FRACTURE BEHAVIOR OF STITCHED C/SiC COMPOSITES

Cao Mingyue^*
,,
Zhang Qi^*,
Wu Jianguo^†,
Ge Jingran^{*2)
,},
Liang Jun^{*3)
,}

^*Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081, China
^†Key Laboratory of Reliability and Environment Engineering Technology, Beijing Institute of Structure and Environment Engineering, Beijing 100076, China

摘要

摘要: C/SiC复合材料具有高比强度、高比模量和优良的热稳定性能等一系列优点, 广泛应用于航空航天领域中. 裂纹扩展进而引起的脆性断裂是其主要失效形式之一, 因而材料的断裂性能分析对材料的结构设计和应用有重要的指导意义. 本文开展了缝合式C/SiC复合材料简单力学试验和断裂试验, 研究了材料在不同载荷下的力学响应及断裂特征. 基于缝合式C/SiC复合材料简单力学试验, 建立了材料宏观非线性损伤本构方程, 并模拟了缝合式C/SiC复合材料单边切口梁和双悬臂梁的断裂行为. 本构方程采用简单函数描述了材料在复杂应力状态下的非线性应力-应变曲线, 并考虑了反向加载过程中造成的裂纹闭合. 基于商业有限元软件ABAQUS, 通过编写UMAT子程序实现非线性损伤本构方程, 采用单个单元验证了建立的本构方程的有效性. 在此基础上, 采用线弹性损伤本构和非线性损伤本构分别模拟了缝合式C/SiC复合材料单边切口梁和双悬臂梁的断裂行为. 采用非线性损伤本构方程模拟的力-位移曲线结果与试验结果更为吻合, 非线性损伤本构预测的失效载荷与试验失效载荷更为接近, 验证了所建立的非线性损伤本构方程的准确性, 为C/SiC复合材料断裂行为的研究提供了借鉴, 为缝合式C/SiC复合材料结构的设计和应用提供了理论基础.
- 缝合式C/SiC复合材料 /
- 非线性本构 /
- 断裂 /
- 损伤
Abstract: C/SiC composites have a series of advantages such as high specific strength, high specific modulus, excellent thermal stability, etc, being widely used in the aerospace field. Brittle fracture caused by crack propagation is one of its main failure forms. Therefore, the fracture performance analysis of the material has important guiding significance for the structural design and application of the material. Simple mechanical experiments and fracture experiments of stitched C/SiC composites are carried out, the mechanical response and fracture characteristics of the materials under different loads being studied in the paper. Based on simple mechanical experiments of stitched C/SiC composites, the macroscopic nonlinear damage constitutive equation is established, and the fracture behavior of stitched C/SiC composites with unilateral notched beam and double cantilever beam are simulated. The constitutive equation uses simple equations to describe the nonlinear stress-strain curve of the material under complex stress conditions, and considers the crack closure on the reverse loading process. Based on the commercial finite element software ABAQUS, the non-linear damage constitutive equations are realized by writing a UMAT subroutine. The validity of the established constitutive equation is verified by a single element. On this basis, the linear elastic damage constitutive model and the nonlinear damage constitutive model are used to simulate the fracture behavior of the stitched C/SiC composites with a single-side notched beam and a double cantilever beam, respectively. The force-displacement curves simulated by the nonlinear damage constitutive equation are more consistent with the test results, and the failure load predicted by the nonlinear damage constitutive are closer to the test failure load, which verifies the accuracy of the nonlinear damage constitutive equation established in this paper. The paper provides a reference for the study of the fracture behavior of C/SiC composites and provides a theoretical basis for the design and application of stitched C/SiC composites structures.
- stitched C/SiC composites /
- nonlinear constitutive /
- fracture /
- damage

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参考文献(1)

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