Numerical Simulation Of Mechanical Behavior Of Random Spruce Short Fiber Reinforced Polypropylene Composites

Due to light-weighted, high fracture toughness of random spruce short fiber reinforced polypropylene composites, they are increasingly becoming the first choice of automotive, high-speed trains and aircraft for load-bearing component. Owing to the biodegradable material can be recycled, environmentally friendly and the urgent demand of the re-use of natural resources and environmental protection, the application and research value of the materials become more prominent.We combined the elastic-plastic finite element method and the random distribution of spruce fiber element program in FORTRAN code, and simulated the tensile and fracture behavior of the composites in ABAQUS numerically.Firstly, the two-dimensional tensile model of random spruce short fiber reinforced polypropylene composites which with different fiber content and different fiber radius have been established, their true stress true strain curves were simulated, and an analysis of these factors which have influence on the true stress-strain curves was given. Secondly, with crack tip singularity grid, the two-dimensional elastic-plastic fracture mechanics model which with different fiber content have been established, and an analysis of the fiber content which have influence on the fracture mechanics parameters was given,such as COD, CTOD and J integral. Finally, two-dimensional elastic fracture mechanics model of Polypropylene(PP) has been established, the crack tip stress field, stress intensity factor and J integral were computed.The results showed that with random short-fiber content of spruce increased its tensile strength decreased and fracture toughness increased.