Satoru Hirosawa

Mechanical Behaviours for Textile Composites by FEM Based on Damage Mechanics

To make an expansion of composite consumption ever widening with use at demanding and safety critical applications, it is important to establish the evaluation technique of the strength, the safety, etc. To reach the goal with a useful reliable technique, we have developed a numerical simulation program on damage development of composites based on damage mechanics. The following points are the keys to simulate the mechanical behavior; (1) The generation technique of FE model with yarns and matrix, (2) The classification of anisotropic damage mode based on damage mechanics, (3) Multi-scale modeling by Mesh superposition method. In this paper, the numerical technique and the results of multi-scale analysis of woven composites are described.

Proposal Regarding Analytical Technique of Mechanical Behavior for Textile Composites by Inclusion Element Method

As one of the analytical technique of mechanical behavior for the textile composites, inclusion element method by the subcell division was proposed, and the verification on the effectiveness was carried out. In the inclusion element method, it is possible to analyze using very simple grid finite element, obtaining the element siffiness by the inclusion method by cooperation with the fabric structure simulator. As a result of comparing with the real model analysis, it was shown that peculiar condition of the woven composites in the deformation behavior is confirmed and the internal stress is also estimable. The analytical result by the inclusion element model is greatly dependent on approach to division of the subcell, but if it is same or lower level number of elements as the real model, it was shown that the sufficient result was obtained.