多孔質炭素の力学的特性評価

抄録

Porous carbon materials are potentially applicable for light-weight applications such as advanced spacecraft structures. One of the problem is the lack of the investigation about microscopic stress state during a fracture process. In this study, stress analysis of a porous carbon material, which has three-dimensionally networked structure, was performed in order to estimate microscopic stress distribution under uniaxial compressive loading condition. The complicated microstructure was modeled three-dimensionally with the help of the image-based modeling technique using X-ray computed tomography. The predicted elastic properties by homogenization method were in good agreement with the experimental values. Next, a compressive test was simulated and finally the microscopic stress distribution was predicted. Principal stress in strut corresponded to the compressive strength of bulk glassy carbon at the time of the compression failure. Therefore, it was indicated that a fracture of porous media occurred when a principal stress in strut reached a compressive strength of a solid material.