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Compressive strength of hydrostatic-stress-sensitive materials at high strain-rates

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Abstract

Many engineering materials demonstrate dynamic enhancement of their compressive strength with the increase of strain-rate, which have been included in material models to improve the reliability of numerical simulations of the material and structural responses under impact and blast loads. The strain-rate effects on the dynamic compressive strength of a range of engineering materials which behave in hydrostatic-stress-sensitive manner were investigated. It is concluded that the dynamic enhancement of the compressive strength of a hydrostatic-stress-sensitive material may include inertia-induced lateral confinement effects, which, as a non-strain-rate factor, may greatly enhance the compressive strength of these materials. Some empirical formulae based on the dynamic stress-strain measurements over-predict the strain-rate effects on the compressive strength of these hydrostatic-stress-sensitive materials, and thus may over-estimate the structural resistance to impact and blast loads, leading to non-conservative design of protective structures.

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Authors and Affiliations

  1. School of Mechanical, Aerospace and Civil Engineering, The University of Manchester, PO Box 88, Manchester, M60 1QD, UK

    Q. M. Li & Y. B. Lu

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  1. Q. M. Li
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  2. Y. B. Lu
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Correspondence to Q. M. Li.

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LI Q M, born in 1962, male, Dr, reader.

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Li, Q.M., Lu, Y.B. Compressive strength of hydrostatic-stress-sensitive materials at high strain-rates. Trans. Tianjin Univ. 14, 324–328 (2008). https://doi.org/10.1007/s12209-008-0055-1

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  • DOI: https://doi.org/10.1007/s12209-008-0055-1

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