RIA: Damage Evolution Based on Distributed and Localized Changes of Microstructure

本研究的目的是：（1）开发一个 带场方程和边界的连续损伤理论 （二）全面落实《 理论使用符号计算和直接接口， 有限元代码; iii）调查之间的相互关系 整体失稳和局部压缩破坏， 带连接的连续损伤理论的分叉分析 纤维微屈曲; iv）对复合材料进行压缩试验 在复合载荷作用下， 微观机制，并与理论预测相关联。 的 建议的研究将对优化设计产生影响， 复合材料结构在复合载荷作用下容易发生 压缩破坏 它还将改善 高性能复合材料的制造工艺， 识别失败的微观机制。

The objectives of the proposed research are 1) to develop a continuum theory of damage with field equations and boundary conditions based on the gauge principle; ii) to fully implement the theory using symbolic computations and direct interface with a finite element code; iii) to investigate the interrelation between global instability and local compressive failure based on bifurcation analysis of the continuum damage theory with connection to fiber microbuckling; iv) conduct compression tests on composite cylinders under combined loading in order to identify the failure micromechanisms and correlate with theoretical predictions. The proposed research will have an impact on the optimum design of composite structures loading under combined loading and prone to compressive failure. It will also improve the modeling of manufacturing processes for high performance composites by identifying the micromechanisms of failure.