| Compressive Strength of Hydrostatic-Stress-Sensitive Materials at High Strain-Rates |
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| 作者单位： | School of Mechanical，Aerospace and Civil Engineering，The University of Manchester，PO Box 88，Manchester M60 1QD，UK |
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| 摘 要： | 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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| 关 键 词： | 耐压强度 数字模拟 流体静力-压力感光材料 材料学 |
| 收稿时间： | 6 August 2006 |
Compressive Strength of Hydrostatic-Stress-Sensitive Materials at High Strain-Rates |
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| Authors: | LI Q M LU Y B |
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| Institution: | School of Mechanical,Aerospace and Civil Engineering,The University of Manchester,PO Box 88,Manchester M601 QD,UK |
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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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| Keywords: | hydrostatic-stress-sensitive materials split Hopkinson pressure bar dynamic increase factor compressive strength numerical simulation |
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