PROGRESSIVE DAMAGE MODELING OF POROUS COMPOSITE MATERIALS BY MULTI-SCALE FINITE ELEMENT METHOD
Z.Q.Lian, C.Y.Tang, Z.W.Wang, C.P.Tsui, M.Y.C.Pang, W.O.Wong, B.Gao, C.L.Chow UDC: (66.018.9:519.248)
Porous composite materials have a wide spectrum of applications in the aerospace and marine industries and biomedical engineering. A multi-scale finite element method (FEM) incorporating the element-failure method (EFM) and the strain invariant failure theory (SIFT) was proposed to simulate the progressive damage of porous composite materials under compression in this study. In micro-scale, a three-dimensional FE repeated cell model was constructed to determine the mechanical properties of the base composite material. Moreover, two-dimensional porous repeated cell models in macro-scale were developed to predict damage propagation in the porous polymer composite. The porous models with three different arrays of pores were constructed to investigate the effect of spatial arrangement of the pores on the progressive damage behavior of the porous composites. Porous hydroxyapatite/ polyetheretherketone (HA/PEEK) composites under compression loading was chosen as a case example to illustrate the implementation of the proposed method. The simulation results showed that the proposed method was feasible and effective in simulating the progressive damage behavior of porous composite materials. The model with the hexagonal arrangement of pores was found to be more resistant to damage propagation under compression loading.