超软材料的辐射惯性效应来自霍普金森棒和溶液方法
Yue Liu1,2, Yongshuai Wang1,2, Qiong Deng1,2
1Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications, School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China.
Materials (Basel, Switzerland)
|August 10, 2024
概括
辐射惯性效应会在用Split-Hopkinson压力杆测试的超软材料中引起人造应力峰值. 这项研究确定了减少这些峰值的方法,改进了动态机械行为分析.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 固体力学 固体力学是什么
背景情况:
- 分裂-霍普金森压力棒 (SHPB) 技术对于评估动态机械性能至关重要.
- 超软材料在SHPB测试期间表现出非内在应力峰值,阻碍了准确的分析.
- 这些峰值归因于动态负载期间的辐射惯性效应.
研究的目的:
- 调查SHPB测试期间超软材料中人工应力峰值的原因.
- 提出并验证减轻辐射惯性效应的方法.
- 为超软材料准确测试提供实验指导.
主要方法:
- 使用SHPB对超软材料的应力-应变行为进行实验调查.
- 数字模拟来分析辐射惯性效应.
- 材料密度的系统变化,应变加速和几何比率 (内部/外部直径).
主要成果:
- 辐射惯性效应被证实是应力峰值的来源.
- 尖端应力与材料密度和应变加速线性相关.
- 当内部/外部直径比下降到0.3.3以下时,观察到尖端应力显著减少.
- 波桑效应诱导了抛物线辐射应力分布,增加了高于0.3.3的比率的峰值应力.
结论:
- 辐射惯性效应是SHPB对超软材料的测试中的一个重要的工件.
- 优化内部/外部直径比对于最小化应力峰值至关重要.
- 拟议的方法和指南提高了软材料动态机械测试的可靠性.
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