基于三维通用单胞方法的平纹编织复合材料多尺度损伤模拟方法

为了解决编织复合材料多尺度损伤模拟的技术难题,发展了基于三维通用单胞模型(GMC)的多尺度损伤模拟方法。基于通用单胞方法基本理论,推导宏细观参量的转换公式,设计了宏细观损伤增量步迭代流程。以二维平纹编织陶瓷基复合材料为例,开展了结构单胞的细观损伤模拟,以及其平板试验件的多尺度损伤模拟,得到了细观损伤云图和宏观应力应变曲线。研究表明:该方法模拟的结构单胞细观损伤过程与文献描述的损伤机理相符,预测的平板试验件损伤过程的应力应变曲线与试验结果基本吻合,所预测强度值的相对误差小于5%。

Multiscale damage simulation of plain weave composites ,based on 3D general method of cells

In order to solve the technical difficulty of operating multiscale simulation on the braided composites of highly complicated mesoscopic structure, a multiscale damage simulation method based on 3D general method of cells(GMC) model was developed. Based on the basic theory of the GMC method, the conversion formula of macroscopic and mesoscopic parameters was derived, and the iterative process of macroscopic and mesoscopic damage increment steps was developed. Taking the 2D plain weave ceramic matrix composite as an example, the mesoscopic damage simulation on the unit cell was examined and the multi-scale damage simulation on the flat test piece of the 2D plain weave composites was performed. The mesoscopic damage contours and macroscopic stress-strain curve were obtained. The research revealed that the unit cell mesoscopic damage process simulated by the method agreed with the damage mechanism described in the related literatures. The predicted stress-strain curve during the damage process of the flat test specimen was consistent with the test results, and the relative error of the predicted intensity value was less than 5%.