Effect Of Interphase On Tensile Behavior Of Random Spruce Short Fiber Reinforced Thermoplastic Composites

Because of light-weighted, high fracture toughness of Random Spruce Short Fiber reinforced polypropylene composites; they are preferred by automotive, high-speed trains and aircraft for load-bearing component increasingly. Owing to the urgent demand of the re-use of natural resources and environmental protection,the recycled, environmentally friendly properties of the biodegradable material make the application and research value of the materials become more prominent.Elastic-plastic finite element method and the random distribution of spruce fiber element program in common code are combined for this simulation, and simulated the tensile behavior of this composites in ABAQUS numerically, with the consideration of the interphase factor, by using the CZM. The tensile behavior and the cyclic loading behavior were simulated with this 2D tensile numerical model.The 10%, 20%and 49% volume content are simulated in terms of the true stress-strain curve, the parameters of the CZM were determined. The result from the CZM tensile model had been compared with the experiment result correctly. The interphase fracture energy, strength and the form of the traction-separation law were analyzed quantitatively through the parameter of the CZM. The result proved the experimental phenomenon that the interphse strength was decreasing with the increasing in fiber content. On basis of the conclusion, the tensile behavior of this material with the 30% fiber content is predicted and the sisal fiber reinforced PP composite has been compared with the experiment result through this CZM model.The CZM interphase tensile FEM predicted the true stress-strain curve for the tensile-unload and the reload, the cyclical strain and compressive load of the composite. The local CZM response for the Traction-Separation was changed with the overall load changing. The CZM parameters and the interphase fracture energy were discussed under the tensile-unload and the reload, the cyclical strain and compressive load of the composite quantitatively.The research showed that the CZM interphase model could quantitatively represent the influence of the different fiber volume content, random microstructure, and the interphase for the tensile-unload and the reload, the cyclical strain and compressive load of the composite. The quantitative analysis could help to understand the mechanism which the interface transfers the stress between fiber/PP. Also, it must have been guiding significance for the research on the quantitatively controlling random short fiber microstructure and interface mechanical performance, the global stiffness of composite material, the optimal design for the strength...