Analytical Modeling of High Rate Processes
Final rept. Dec 92-Apr 96
ALABAMA UNIV UNIVERSITY
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A Modeling of terminal ballistic events requires accurate constitutive data at strain rates exceeding 10,000sec and at high strains. The Split Hopkinson Pressure Bar can provide information in both tension and compression at high strains, but is limited in strain rate by the elastic wave speed in the bars. It is generally accepted that 10,000sec is the limit of such devices. Strain rates that exceed 10,000sec can be easily achieved in the Taylor impact test. The question that remains is how to best extract information from that test. The work performed on this project extends and revises prior efforts to deduce the constitutive properties of ductile metals with one dimensional analyses. The problem is approached from several perspectives 1 engineering modeling, 2 dislocation based mechanics, 3 shock physics, and 4 computational mechanics. In all cases there are similar conclusions and the basis for reasonable constitutive modeling using the Taylor impact test has been established.