| 冲击加载条件下金属粉末的动态力学性能分析 |
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| 引用本文： | 罗晓龙,刘军,胡仙平.冲击加载条件下金属粉末的动态力学性能分析[J].粉末冶金技术,2018,36(2):111-117. |
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| 作者姓名： | 罗晓龙 刘军 胡仙平 |
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| 作者单位： | 宁波大学机械工程与力学学院, 宁波 315211 |
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| 基金项目： | 国家自然科学基金资助项目11372148 |
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| 摘 要： | 为研究金属粉末在冲击加载过程中, 粉末预压力对压坯动态力学响应的影响, 设计了基于分离式霍普金森压杆装置(split Hopkinson pressure bar, SHPB)的金属粉末高应变率冲击加载实验, 并结合一维应力波理论对预压后粉末压坯的力学性能进行分析。结果表明:在冲击过程中, 金属压坯会表现出较为明显的应变率效应; 加载率越大, 材料的应变能越大, 预压力越大, 应变硬化率越大; 在相同的加载条件下, 预压力越大, 压坯临界位移越小。
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| 关 键 词： | 冲击加载 金属粉末 应变率 预压力 霍普金森压杆 |
| 收稿时间： | 2017-09-19 |
Analysis on dynamic mechanics performance of metal powders by impact loading |
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| Affiliation: | Faculty of Mechanical Engineering & Mechanics, Ningbo University, Ningbo 315211, China |
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| Abstract: | A split Hopkinson pressure bar (SHPB) test system was designed to study the dynamic mechanics performance of metal particle by impact loading. The powder mechanical properties were analyzed by one-dimensional stress wave theory. The results show an obviously strain rate effect in the impact compaction process. As the pre-pressure increases, the faster loading rate results in the larger material strain energy, and the strain hardening rate is higher. The critical displacement of green-compacts is decreased with the increase of pre-pressure under the same loading condition. |
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