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工程力学  2015 

冻土冲击动态应力-应变曲线特征及汇聚现象分析

DOI: 10.6052/j.issn.1000-4750.2014.03.0243, PP. 52-59

Keywords: 冻土,本构关系,霍普金森压杆,冲击实验,汇聚现象

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Abstract:

研究通过系统的霍普金森压杆实验,分析了冻土冲击动态应力-应变曲线的特征,验证了冻土的应变汇聚现象,揭示了产生这一现象的原因。研究发现应变率、实验冻结温度和初始含水量等参数对应力-应变曲线均有影响,而应变汇聚现象产生的首要条件是具有相同的加载应变率,与温度和初始含水量等参数无关。同时,冻土的动态裂纹损伤类型和裂纹损伤演化方式能够直接影响汇聚现象中应力-应变曲线的形状,温度损伤现象是冻土特有的动态力学性能和应变汇聚现象产生的重要原因。此外,霍普金森压杆实验特殊的冲击动态加载方式和实验基本假设产生了特定的加载历程,实验加载条件决定了应变汇聚现象的汇聚点位置。因此,应变汇聚现象反映了冲击动态加载条件下冻土特有的力学性能,是冻土固有性质和实验手段共同作用的结果。

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