穿孔复合板材的渐进性故障分析,考虑到非线性剪切效应
Z R Wu1,2, Yirong Yang3, Hang Lei4
1State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, Jiangsu, China. zrwu@nuaa.edu.cn.
Scientific reports
|December 16, 2023
概括
这项研究使用先进的有限元素分析模拟穿孔碳纤维复合材料的故障演变. 该研究引入了一种新模型,可以准确预测航空航天结构中的故障模式,从而提高设计安全性.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 计算力学 计算力学 计算力学
背景情况:
- 复合材料为航空航天等高压力应用提供了卓越的性能.
- 现实世界的复合结构经常包含诸如隙和空隙等特征,需要详细的故障分析.
- 了解穿孔复合材料的故障演变对于确保工程结构的完整性和安全性至关重要.
研究的目的:
- 通过数值模拟故障演变并识别碳纤维增强树脂复合板材中具有大开口的故障模式.
- 开发和验证一个强大的有限元模型,能够预测复合材料的渐进损坏.
- 为了研究非线性剪切效应对不同层层叠叠序列的故障行为的影响.
主要方法:
- 开发一个UMAT子程序,集成3D Hashin-Ye故障标准和渐进式损坏机制.
- 整合特征长度和粘度系数以减轻网格依赖并增强计算趋同.
- 在损害退化模型中整合Ramberg-Osgood方程用于非线性剪切构成关系.
主要成果:
- 开发的模型成功模拟了具有大开口的复合板材的故障演变和故障模式.
- 引入非线性剪切效应显然影响了层层材料的故障进展.
- 网格依赖性减少了,并通过模型增强改进计算趋同得到了改善.
结论:
- 有限元模拟为穿孔复合结构的故障机制提供了重要的见解.
- 经过验证的模型作为一个有价值的工具,用于预测复合材料组件的结构完整性要求高的应用程序.
- 进一步的研究可以探索这种模型对更复杂的复合体几何形状和加载条件的应用.
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