变形模式对多孔金属材料SHPB实验结果的影响

王鹏飞; 徐松林; 郑航; 胡时胜

doi:10.6052/0459-1879-11-354

变形模式对多孔金属材料SHPB实验结果的影响

doi: 10.6052/0459-1879-11-354

中国科学技术大学中国科学院材料力学行为和设计重点实验室, 合肥 230027

基金项目: 国家自然科学基金资助项目(90916026).

详细信息

通讯作者:
胡时胜

中图分类号: TB122
计量
- 文章访问数: 1890
- HTML全文浏览量: 85
- PDF下载量: 907
- 被引次数: 0
出版历程
- 收稿日期: 2011-11-30
- 修回日期: 2012-02-25
- 刊出日期: 2012-09-18

INFLUENCE OF DEFORMATION MODES ON SHPB EXPERIMENTAL RESULTS OF CELLULAR METAL

CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, China

Funds: The project was supported by the National Natural Science Foundation of China (90916026).

摘要

摘要: 利用两种改进后的Hopkinson杆实验分别测得多孔金属材料冲击端和支撑端的应力.实验结果及高速摄影表明,随着撞击速度的增加,试件两端的应力均匀性变差,分别对应着泡沫材料的3种变形模式:准静态模式、过渡模式、冲击模式.实验得出在冲击模式下,冲击端与支撑端的应力与试件的厚度无关,但是与试件的密度有关.在多孔金属的高应变率实验中,变形模式对SHPB实验有很大的影响,轴向惯性(波动)效应会导致试件两端的应力不均匀,此时利用SHPB得出的实验结果将会是应变率效应和惯性效应的耦合,不能真实反映材料的动态力学性能(应变率效应).
- 应变率效应 /
- 惯性效应 /
- 应力均匀 /
- 多孔金属 /
- 变形模式 /
- 分离式Hopkinson压杆
Abstract: Two types of improved Hopkinson bar were used to measure the stress on the impact and support ends of a cellular metal specimen.The experimental results and high-speed photography showed,as the impact velocity increased,the stress on the impact end increased,while the stress on the support end didn't change.The stress uniformity of two ends became worse when the impact velocity increased.Based on the experimental results we infer that under the shock mode,the stress on two ends is unrelated to the thickness of the specimen,but related to the density of the materials.In the high-strain-rate experiment of cellular metal,axial inertia (wave) effect will lead to stress non-uniformity.The results would be the coupling of axial inertia effect and strain rate effect and could not represent the dynamic mechanical properties of the materials.
- strain rate effect /
- inertia effect /
- stress uniform /
- cellular metal /
- deformation mode /
- SHPB

HTML全文

参考文献(12)

Kolsky H.An investigation of the mechanical properties of material at very high rates of loading.Proceedings of the Physical Society of London,1949,B62:676-700

胡时胜.霍普金森压杆技术.兵器材料科学与工程,1991,11:40-47 (Hu Shisheng.Technology of Hopkinson pressure bar.Ordnance Material Science and Engineering,1991,11:40-47(in Chinese))

王礼立,朱兆祥.应力波基础.北京:国防工业出版社,1985 (Wang Lili,Zhu Zhaoxiang.Foundation of Stress Waves.Beijing:National Defense Industry Press,1985 (in Chinese))

Kanahashi H,Mukai T,Yamada Y,et al.Dynamic compression of an ultra-low density aluminium foam.Materials Science and Engineering,2000,A280:349-353

Deshpande VS,Fleck NA.High strain rate compressive behaviour of aluminum alloy foams.International Journal of Impact Engineering,2000,24:277-298

胡时胜,王悟,潘艺等.泡沫材料的应变率效应.爆炸与冲击,2003,23(1):13-18 (Hu Shisheng,Wang Wu,Pan Yi,et al.Strain rate effect on the properties foam materials.Explosion and Shock Waves,2003,23(1):13-18 (in Chinese))

Lee S,Barthelat F,Moldovan N,et al.Deformation rate effects on failure modes of open-cell Al foams and textile cellular materials.International Journal of Solids and Structures,2006,43:53-73

Tan PJ,Reid SR,Harrigan JJ,et al.Dynamic compressive strength properties of aluminium foams.Part I——experimental data and observations.Journal of the Mechanics and Physics of Solids,2005,53:2174-2205

Tan PJ,Reid SR,Harrigan JJ,et al.Dynamic compressive strength properties of aluminium foams.Part II—— 'shock' theory and comparison with experimental data and numerical models.Journal of the Mechanics and Physics of Solids,2005,53:2206-2230

刘耀东,虞吉林,郑志军.惯性对多孔金属材料动态力学行为的影响.高压物理学报,2008,22(2):118-124 (Liu Yaodong,Yu Jilin,Zheng Zhijun.Effect of inertia on the dynamic behavior of cellular metal.Chinese Journal of High Pressure Physics,2008,22(2):118-124 (in Chinese))

Zheng ZJ,Yu JL,Li JR.Dynamic crushing of 2D cellular structures:a finite element study.Int J Impact Eng,2005,32(1-4):650-664

宋博,胡时胜,刘剑飞.泡沫塑料中冲击波的传播.实验力学,1999,14(3):273-278 (Song Bo,Hu Shisheng,Liu Jianfei.Shock wave in foam plastic.Journal of Experimental Mechanics,1999,14(3):273-278 (in Chinese))

施引文献

资源附件(0)

访问统计