Thermo-dynamic response of ASME A913 grade 65 steel and graded, corrugated sandwich panels under shock loading

Jefferson Townsend Wright, University of Rhode Island

Abstract

An experimental study on the thermo-dynamic compressive constitutive behavior of A913 grade 65 steel and the response of graded, corrugated sandwich panels under shock loading was conducted. Thermo-dynamic compressive experiments were undertaken using a Split Hopkinson Pressure Bar apparatus in conjunction with an induction heater. This data in combination with quasi-static data collected at the University of Connecticut was used to construct a Johnson-Cook constitutive model of the steel. The results show an increase in yield strength as strain rate increases and a decrease as temperature increases. The steel also undergoes strain hardening that decreases as temperature increases. ^ The shock experiments on the graded, corrugated steel panels were conducted using a shock tube apparatus in combination with a Photron SA1 digital high speed camera and PCB pressure transducers. Various combinations of corrugation gradation were tested in order to understand the effects of gradation on the shock response of corrugated panels. The results show that a gradual, linearly graded corrugation, from the thinnest corrugation on the front face to thickest corrugation on the back face, mitigates back face deflection of the panel the most, especially when normalized due to areal density. This arrangement leads to a new sequential collapse mode.^

Subject Area

Engineering, Mechanical|Engineering, Materials Science

Recommended Citation

Jefferson Townsend Wright, "Thermo-dynamic response of ASME A913 grade 65 steel and graded, corrugated sandwich panels under shock loading" (2012). Dissertations and Master's Theses (Campus Access). Paper AAI1508326.
http://digitalcommons.uri.edu/dissertations/AAI1508326

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