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Strain-rate effect on initial crush stress of irregular honeycomb under dynamic loading and its deformation mechanism 被引量:4
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作者 Peng Wang Zhijun Zheng +1 位作者 Shenfei Liao Jilin Yu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2018年第1期117-129,共13页
The seemingly contradictory understandings of the initial crush stress of cellular materials under dynamic loadings exist in the literature, and a comprehensive analysis of this issue is carried out with using direct ... The seemingly contradictory understandings of the initial crush stress of cellular materials under dynamic loadings exist in the literature, and a comprehensive analysis of this issue is carried out with using direct information of local stress and strain. Local stress/strain calculation methods are applied to determine the initial crush stresses and the strain rates at initial crush from a cell-based finite element model of irregular honeycomb under dynamic loadings. The initial crush stress under constant-velocity compression is identical to the quasi-static one, but less than the one under direct impact, i.e. the initial crush stresses under different dynamic loadings could be very different even though there is no strain-rate effect of matrix material. A power-law relation between the initial crush stress and the strain rate is explored to describe the strain-rate effect on the initial crush stress of irregular honeycomb when the local strain rate exceeds a critical value, below which there is no strain-rate effect of irregular honeycomb. Deformation mechanisms of the initial crush behavior under dynamic loadings are also explored.The deformation modes of the initial crush region in the front of plastic compaction wave are different under different dynamic loadings. 展开更多
关键词 Cellular material Constant-velocity compression direct impact Cross-sectional stress Initial crush stress strain rate effect
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高应变率下铁锰铸造合金正向和反向应变率效应的研究 被引量:6
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作者 董新龙 王礼立 +1 位作者 李深智 许正勋 《爆炸与冲击》 EI CAS CSCD 北大核心 2002年第1期20-25,共6页
对两种铁锰铸造合金在准静态和冲击动态下进行了宏观与微观相结合的试验研究。实验结果表明 ,在准静态下 ,铁锰铝硅合金的强度高于铁锰铝合金 ,但在高应变率动态加载下 ,铁锰铝合金的强度反而高于铁锰铝硅合金。铁锰铝合金表现出很强的... 对两种铁锰铸造合金在准静态和冲击动态下进行了宏观与微观相结合的试验研究。实验结果表明 ,在准静态下 ,铁锰铝硅合金的强度高于铁锰铝合金 ,但在高应变率动态加载下 ,铁锰铝合金的强度反而高于铁锰铝硅合金。铁锰铝合金表现出很强的应变率强化效应 (正向应变率效应 ) ,而铁锰铝硅合金表现出应变率无关或应变率弱化效应 (反向应变率效应 )。随着应变率的进一步提高 ,两者又都存在一定程度的应变率弱化倾向。根据这一现象 ,着重对高应变率下的绝热温升所致热软化、内部损伤的率相关演化。 展开更多
关键词 动态力学性能 铁锰合金 正向应变率效应 反向应变率效应 铸造 高应变率 准静态 应变率弱化 绝热温升 热软化 应力诱变马氏体相变
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