Multi-Scale Modeling and Damage Analysis of Composite with Thermal Residual Stress

Abstract

In order to analysis thermal residual stress and its influence on the strength of composite, the hierarchical multi scale simulation method is applied. A microscopic computational model of single fiber composite with thermal residual stress is built to research the stress distribution. Then the damage initiation discipline details of unidirectional composite are researched, and the effects of different fiber arrangements on thermal residual stress distribution, damage initiation and the different final failure behaviors of fiber regular distribution and random distribution under tension and compression are researched in details. It shows that in fiber regular arrangement, damage initiation in interface appears evenly and in matrix it appears at somewhere randomly. But in fiber random arrangement, initial damage focuses at the resin pockets between closely packed fibers with both interface and matrix damage. The maximal thermal residual stress in fiber random arrangement model is larger than that in fiber regular arrangement model. And it reaches the normal strength of the interface and thus causing the initiation of interface damage. Also the failure modes of composites under transverse tension and compression with and without residual stress are quite different from each other. The strength and failure path of different RVE and loading are showing respectively in this paper.

Numerical investigation of hot bulk forming processes with respect to the resulting residual stress distribution

“…Furthermore, phase transformation occurs on microscopic level during hot bulk forming, which also suggests multi-scale analysis. Recent works in that field are among others the analysis of a single-phase alloyed cylindrical specimen after quenching [5] or a multi-scale approach to investigate thermal residual stresses in a three-phase cylinder, see [6]. In [7] a reduced multi-scale model for heat treatment is proposed, which takes into account thermal effects, residual stresses and phase transformation.…”

Finite Element Analysis of Residual Stress Distribution Patterns of Prestressed Composites Considering Interphases

“…To obtain the TRS in the composites, both analytical and numerical methods have been developed and widely used. The developed analytical methods can be divided into two groups, including one-dimensional models [ 11 , 12 ] and three-dimensional models [ 13 , 14 ]. For the one-dimensional models, only the TRS values along the fiber direction can be obtained.…”

Investigation of residual stresses induced by composite forming using macro-micro simulation

“…Understanding composites at the microscale is essential because residual stresses affect the micro defects, and subsequently influence the fatal failure of the composite. [6][7][8] Neglecting micro-residual stresses may lead to considerable error in the prediction of thermal residual stresses in composite laminates. 9 However, it is quite difficult to measure residual stresses in a composite using nondestructive testing directly.…”