二種の高分子内衝撃波面における応力・ひずみ特性のひずみ速度効果(<特集>極限環境)

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For numerical design of safety compartments in a cabin of aircraft to maintain a survivable environment for passengers in a crash, very-high-strain-rate mechanical-properties of many kinds of aerospace materials are indispensable. On the basis of the Unsteady Wave Sensing System (UWSS), which is composed of a plate impact experiment using three in-material gauges and nanosecond Lagrangian analyses, various variables are determined at the sensing part of the central gauge. Three stress-time histories are measured by three PVDFgauges, respectively, and the time histories of the phase velocity associated with the stress: U^σ, particle velocity: v, the phase velocity associated with the particle velocity: U^v, and strain: ε induced by impact at velocities ca.600m/s are calculated by using those three stress-time curves and the conservation relations of mass and momentum. Then, the stress-strain curves at very high strain-rate of the order 10^6 to 10^7s^<-1> are derived under conditions of uniaxial strain. On the other hand, stress-stain curves at medium strain rate (ca. 10^2s<-1>) and at low strain rate (ca. 10^<-4>s^<-1>) under conditions of uniaxial stress were already determined by a drop-weight testing system and Instron testing machine, respectively. It is clearly shown that the stress-strain curves for PMMA and polycarbonate (PC) are both very sensitive to strain rate in the very wide range of strain-rate of 10^<-4>s^<-1> to 10^7s^<-1> under conditions of uniaxial strain. As a result, power law relations between stress and strain-rate were observed with these glassy polymers under uniaxial strain conditions in the very wide strain-rate range.
社団法人日本材料学会の論文
2006-03-15

二種の高分子内衝撃波面における応力・ひずみ特性のひずみ速度効果(<特集>極限環境)

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