다공성 복합재의 파손 강도 예측을 위한 미시역학 전산 해석 = Micromechanical Computational Analysis for the Prediction of Failure Strength of Porous Composites

다국어 초록 (Multilingual Abstract)

Porosity in polymer matrix composites increases rapidly during thermochemical decomposition at high temperatures. The generation of pores reduces elastic moduli and failure strengths of composite materials, and gas pressures in internal pores influence thermomechanical behaviors. In this paper, micromechanical finite element analysis is carried out by using two-dimensional representative volume elements for unidirectionally fiber-reinforced composites with porous matrix. According to the state of the pores, effective elastic moduli, poroelastic parameters and failure strengths of the overall composites are investigated in detail. In particular, it is confirmed that the failure strengths in the transvers and through-thickness directions are predicted much more weakly than the strength of nonpored matrix, and decrease consistently as the porosity of matrix increases.

참고문헌 (Reference)

1 Biot, M.A., "The Elastic Coefficients of the Theory of Consolidation" 24 : 594-601, 1957

2 Looyeh, M.R.E., "Modelling of Reinforced Polymer Composites Subject to Thermo-mechanical Loading" 63 (63): 898-925, 2005

3 Mcmanus, H.L.N., "High Temperature Thermomechanical Behavior of Carbon-Phenolic and Carbon-Carbon Composites - II. Results" 26 (26): 230-255, 1992

4 Mcmanus, H.L.N., "High Temperature Thermomechanical Behavior of Carbon-Phenolic and Carbon-Carbon Composites - I. Analysis" 26 (26): 206-229, 1992

5 Carroll, M. M., "An Effective Stress Law for Anisotropic Elastic Deformation" 84 (84): 7510-7512, 1979

6 Wu, Y., "A Thermomechanical Model for Chemically Decomposing Composites - I. Theory" 35 (35): 113-128, 1997

7 Yang, B.C., "A Theoretical Study of Thermo-mechanical Erosion of High-Temperature Ablatives" Pennsylvania State University, 1992

8 Sullivan, R.M., "A Finite Method for the Thermochemical Decomposition of Polymeric Materials – I. Theory" 30 (30): 431-441, 1992

9 Matsuura, Y., "A Challenge of Predicting Thermo-Mechanical Behavior of Ablating SiFRP with Finite Element Analysis" 6975-, 2010