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To achieve weight saving in an automobile, replacement of a low-carbon steel with an HSLA steel is being considered. In laboratory tension tests at a strain rate of 10−3/s, the yield strengths of the HSLA steel and the low-carbon steel were measured to be 400 MPa and 220 MPa, respectively. The strain rate exponents are m = 0.005 for the HSLA steel and m = 0.015 for the low-carbon steel. What percent weight saving could be achieved if the substitution was made so that the forces were the same at the strain rates of 10+3, typical of crash conditions?
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