加载应力幅值对高纯铜动态损伤演化特性研究

发布时间：2018-01-30 20:48

本文关键词： 层裂加载应力幅值动态损伤演化　出处：《物理学报》2015年05期 　论文类型：期刊论文

【摘要】：研究了加载应力幅值对延性金属高纯无氧铜动态损伤演化特性的影响.层裂实验在一级轻气炮上开展,利用不同的飞片击靶速度实现不同加载应力幅值(2.5 GPa,2.75 GPa和3.75 GPa),采用DISAR位移干涉诊断技术测量样品自由面的速度剖面,利用基于白光轴向色差的表面轮廓测试技术测试软回收的样品截面.结果显示:随着加载应力幅值的升高,层裂强度几乎没有变化,但自由面速度剖面上Pull back信号后的回跳速率和幅值显著增大,损伤演化速率显著升高.进一步分析表明:延性金属动态损伤演化过程中微孔洞成核对加载应力幅值单一因素不敏感,但加载应力幅值是微孔洞长大和聚集的主导因素之一.
[Abstract]:The effect of loading stress amplitude on the dynamic damage evolution characteristics of ductile metal high purity oxygen free copper was studied. The spallation experiment was carried out on the first class light gas gun. The different loading stress amplitudes of 2.5 GPA 2.75 GPa and 3.75 GPA are realized by using different flyer impact velocities. The velocity profile of the free surface of the sample was measured by DISAR displacement interferometry. The surface profile measurement technique based on the white light axial chromatic aberration was used to measure the sample cross-section of soft recovered samples. The results showed that the spallation strength was almost unchanged with the increase of the loading stress amplitude. However, the rebound rate and amplitude of the Pull back signal on the free surface velocity profile increase significantly. Further analysis shows that the stress amplitude of microvoids is insensitive to a single factor during the dynamic damage evolution of ductile metals. However, the loading stress amplitude is one of the leading factors for the growth and accumulation of microvoids.
【作者单位】：中国工程物理研究院流体物理研究所;北京理工大学爆炸科学与技术国家重点实验室;
【基金】：中国工程物理研究院发展基金(批准号:2011A 0201002) 国家自然科学基金(批准号:11202196) 国防基础科研计划(批准号:B1520110003,B1520132013)资助的课题~~
【分类号】：TG146.11
【正文快照】： 研究了加载应力幅值对延性金属高纯无氧铜动态损伤演化特性的影响.层裂实验在一级轻气炮上开展,利用不同的飞片击靶速度实现不同加载应力幅值(2.5 GPa,2.75 GPa和3.75 GPa),采用DISAR位移干涉诊断技术测量样品自由面的速度剖面,利用基于白光轴向色差的表面轮廓测试技术测试软

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