ガラスバルーン-レジン複合材 (Syntactic Foam) の機械的性質に及ぼす静水圧力の影響

抄録

The effect of hydrostatic pressure on the mechanical behavior of a syntactic foam which is composed of glass micro-spheres embeded in epoxy resin matrix was investigated up to the high pressure of 3000kg/cm².
The behavior of the syntactic foam tested under hydrostatic pressure was typically brittle, although the matrix material behaved in a ductile manner. The tensile strength increased linearly with the increase of pressure. The increasing rate of the tensile strength with pressure was larger than that for the matrix material. However, a transition of the mechanical properties occurred around the pressure of 1500kg/cm² and above this pressure the tensile strength dropped and the elongation value increased discontinuously. This transition phenomenon was considered to be related to the breakdown of the glass micro-spheres by hydrostatic pressure. The above trends of the behavior of syntactic foam under hydrostatic pressure were not altered by the change in volume fraction of the micro-spheres, although the transition pressure was affected a little. Penetration effect of the pressure medium used was small on the mechanical properties of the syntactic foam.