The flow stress of many metals is known to vary more strongly with strain rate epsilon above a critical value epsiloncthan below it. An analysis of previous authors' measurements on copper indicates that the value of epsiloncvaries systematically with specimen size. An estimate of inertial stress shows that inertia may be an important mechanism behind this observation. Qualitative arguments suggest that deformation velocity, friction and wave propagation could also contribute.
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D. A. Gorham (1991) studied this question.
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