抄録
A computer program of two-dimensional Finite Element Method (FEM) with a new concept based on damage mechanics has been developed to analyze the mechanical behavior during the progression of fracture in composite materials. The fracture patterns of composite materials are very confusing, since many kinds of damage like resin cracks, fiber breaking and delamination etc. take place.Two characteristics have to be considered in order to describe the damage of anisotropic body like composite materials. One is its progression rate the other is its direction. A numerical procedure for the stiffness matrix of FEM with damaged elements has been introduced in this paper. As the example, the fracture mode of hybrid composites under four-point bending test was analyzed by the developed computer program. In addition, the mechanical behavior under tensile load after bending load was analyzed. The computational results concerning fracture mode and mechanical behaviors agreed well with the experimental results. Consequently, it can be recognized that the developed computer program considering damage is very useful for the analysis of mechanical behavior for composites which have anisotropic properties.
