Shock characteristics obtained by nanosecond analyses for aerospace materials

Yasuhisa Sato; Taku Ueno

doi:10.1117/12.621949

12 April 2005 Shock characteristics obtained by nanosecond analyses for aerospace materials

Yasuhisa Sato, Taku Ueno

Proceedings Volume 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics; (2005) https://doi.org/10.1117/12.621949
Event: Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, 2004, -, Singapore

Abstract

For numerical designs of safety cabin and seats to maintain a survivable environment for passengers and crew in a crash occurrence, very high-strain-rate characteristics of many kinds aerospace materials are indispensable. So, stress-time histories are obtained in two glassy polymers (polymethyl methacrylate: PMMA and polycarbonate: PC) and two kinds of light metals (commercially pure aluminum: A1100-H14[JIS] and super duralumin: A2024-T3[JIS]) at impact velocity 600 to 700 m/s using polyvinylidene fluoride (PVDF) gauges in a plate impact testing by a powder gun. Nanosecond analyses are used to extract strain-time histories from experimental stress data. Then, stress-strain curves at very high-strain-rates (10⁶ to 10⁷ [1/s]) in shock wave region under conditions of uniaxial strain. A drop-hammer compression test is also used to determine stress-strain curves at medium strain rates (10² [1/s]) under conditions of uniaxial stress by using an extrapolation method. For low strain rates (ca. 10^-4 [1/s]), stress-strain curves are determined under conditions of uniaxial stress by a universal testing machine combined with the extrapolation method. Power law relations between stress and strain-rate are observed with the glassy polymers under uniaxial strain conditions in a very wide strain-rate range.

Citation Download Citation

Yasuhisa Sato and Taku Ueno "Shock characteristics obtained by nanosecond analyses for aerospace materials", Proc. SPIE 5852, Third International Conference on Experimental Mechanics and Third Conference of the Asian Committee on Experimental Mechanics, (12 April 2005); https://doi.org/10.1117/12.621949

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