高機能・構造複合材料の破壊解析

复合材料和混凝土具有复杂的非均质特性，承受着复杂的加载过程和环境条件，这使得渐进破坏和损伤的数值预测变得非常困难和繁重。以类似的方式，由于材料的各向异性行为和不同场(电、磁、机械、温度等)的固有耦合效应，在一定程度上对极化功能材料中的缺陷/故障进行准确的数值模拟是相当具有挑战性的，并且通常不是微不足道的。结构和材料的故障可能在制造过程或使用中出现。这种失效严重影响结构和系统的性能。申请人研究的首要目标一直是开发有效的计算数值方法，包括丰富、适应性、涂抹方法及其变体，用于先进功能复合材料和准脆性材料(混凝土)的局部失效和不稳定性。本项目的研究实施情况和取得的成果如下。我们发展了局部浓缩技术和连续损伤模型来模拟混凝土、固体和先进功能复合材料的裂缝和损伤问题。我们还发展了断裂问题的局部网格加密扩展有限元方法。所取得的成果已在专业科学期刊上发表，并在各种专业会议上发表。

The complex heterogeneous nature of composites and concrete with suffering complicated processes of loading and environmental conditions additionally makes it highly difficult and burdensome in numerical prediction of progressive failure and damage. In a similar manner, accurate numerical modeling of imperfections/failure in polarized functional materials to some extent is quite challenging and often not trivial due to the anisotropic material behaviors and inherent coupling effect of different fields (electric, magnetic, mechanical, temperature, etc. The failure of structures and materials can arise during the manufacturing process or in-service. Such failure strongly affects the performance of structures and systems. The overriding objective of the applicant’s research has been to develop effective computational numerical methods in terms of enrichment, adaptivity, smeared approaches, and their variants for localized failure and instabilities of advanced functional composite materials and quasi-brittle materials (concrete). Research implementation and results have been obtained from this project can be stated as follows. We have developed the local enrichment techniques and the continuum damage models for modeling crack and damage problems of concrete, solids and advanced functional composites. We also have developed the local mesh refinement extended finite element method for fracture problems. Obtained results have been published in the professional scientific journals and have been presented at various professional conferences.