K-0614 宇宙環境下にある有機複合材料の弾性係数変化と繊維配向モデル(S05-4 複合材料システムの弾性数理モデリング(4))(S05 複合材料システムの弾性数理モデリング)

Abstract

In this report, we study the tensile strength and Young's modulus of short carbon fiber reinforced thermoplastic polyimide composites (SCFR-PI) in temperature and high vacuum conditions. In order to clarify the mechanical behavior of SCFR-PI composites, tension tests are performed by the use of thermal fatigue testing equipment. Even though tested at the same temperature 298 K, the tensile strengths kept in high vacuum condition are higher than that in the atmospheric condition. Furthermore, the SCFR-PI has higher equivalent Young's modulus than that in the atmospheric condition. In high vacuum condition, the degas and/or moisture desorption from the matrix and from the interface between the matrix and fibers change the performance of each materials and microfractures of the SCFR-PI composites, and then yield the residual stresses in the composites. We also discuss the simulation model for the mechanical behavior of SCFR-PI composites in temperature and high vacuum conditions.