Analysis on interfacial stress in impact of polyphenylene sulfide/CaCO_3 composites

摘要

The interfacial stress and its distribution during impact of inorganic particulate-filled polymer composites were analyzed in the present paper by means of a three-dimensional (3D) finite element method, and the software used was the ANSYS/LS-DYNA (ANSYS Inc., Canonsburg, PA, USA). The simulation results showed that the normal stress, the shear stress, and the equivalent stress reached the maximum at the particle equator, and then they reduced quickly toward the direction of the particle pole along the interface between the particle and the matrix and achieved the minimum from about 0.5 to 2.0 mm from the equator. Finally, they tended to gently or somewhat increase. Furthermore, the ways and mechanisms of the major fail or fracture of the polyphenylene sulfide (PPS)/calcium carbonate (CaCO_3) composites under impact load were discussed. The mechanism of impact fracture or failure of inorganic particle-filled PPS composites might be that the matrix around the neighboring inclusions will first yield owing to the stress concentration in the interface between the inclusion and the matrix to induce crazes and extend quickly.