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冲击加载下材料应力应变曲线振荡现象的研究综述
A review on the oscillation phenomenon of stress-strain curve of material under impact loading
投稿时间:2023-04-21  修订日期:2023-06-16
DOI:
中文关键词:  冲击加载  动态测试  应力应变曲线  振荡
英文关键词:impact loading  dynamic test  stress-strain curve  oscillation
基金项目:国家自然科学基金项目(面上项目);西北工业大学博士论文创新基金
作者单位邮编
李泊立 西北工业大学 710072
王瑞丰 西北工业大学 710072
陈龙洋 西北工业大学 710072
郭伟国* 西北工业大学 710072
摘要点击次数: 1119
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中文摘要:
      在冲击加载下获得的材料应力应变曲线往往具有显著的振荡,长期以来由于很难判断振荡的真伪,即不确定振荡是试样材料的本征特性还是纯粹的机械加载等带来的影响,故曲线的振荡往往没有从真实应力应变曲线中直接消除。但这种振荡的存在掩盖了真实的材料响应,导致很难准确确定材料的动态屈服强度,也影响了材料动态本构关系的建立及其参数的准确性。这对国防和军民用重大装备工程在冲击载荷下的优化设计及安全可靠性带来影响。针对这个长期困扰科研和工程技术人员的普遍性问题,本文综述了冲击加载下材料应力应变曲线振荡现象的研究进展,首先从加载系统设计、应力波传播、试样变形分布等方面分析了动态测试曲线中出现振荡的原因;其次依据振荡成因重点论述了抑制或消除振荡现象的方法;最后总结了现阶段研究的突出问题并对未来发展方向提出一些建议。
英文摘要:
      The stress-strain curves of materials obtained under impact loading generally have significant oscillations. For a long time , it is difficult to judge the authenticity of the oscillations, that is, it is uncertain whether the oscillations are the intrinsic characteristics of sample material or the influence of pure mechanical loading. Therefore, the oscillation of the curve is often not directly eliminated from the true stress-strain curve. However, the existence of the oscillation conceals the real material response, making it difficult to accurately determine the dynamic yield strength of the material, and also affects the establishment of the dynamic constitutive relationship of the material and the accuracy of its parameters. This has an impact on the optimal design and safety reliability of major national defense and military and civilian equipment under impact load. In view of oscillation, a common problem that has long plagued scientific researchers and engineering technicians, the research progress about the oscillation phenomenon of the stress-strain curve of materials under impact loading is reviewed. Firstly, the reason for the oscillation in the dynamic test curve is analyzed from the aspects of loading system design, stress wave propagation, and sample deformation distribution; secondly, the methods of suppressing or eliminating the oscillation phenomenon is mainly discussed according to the causes of oscillation; finally, the outstanding problems of the current research are summarized and some suggestions are put forward for the future development direction.
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