采用分离式霍普金森压杆(SHPB)技术,研究了孔隙率对泡沫铝在高应变速率(700s-1～2 600 s-1)条件下力学性能的影响,并与准静态条件下(1×10-3 s-1)的性能进行了对比.实验发现泡沫铝在准静态和动态条件下呈现逐层破坏的特征,从而在应力-应变曲线上出现一平台区;由于铝合金本身存在的应变速率敏感性和多孔材料中气体的作用,使泡沫铝的平台应力随应变速率的增加而增大,当孔隙率较低时,增加尤为明显;泡沫铝的应变速率敏感度随应变的变化而变化.
参考文献
| [1] | Evans A G;Hutchinson J W;Ashby M F .Multifunctionality of Cellular Metals Systems[J].Progress in Materials Science,1999,43:171. |
| [2] | 刘培生,李铁藩,付超.泡沫金属电阻率的计算方法[J].稀有金属材料与工程,1999(04):260. |
| [3] | Miyoshi T;Itoh M;Mukai T;Kanahashi H .Enhancement of Energy Absorption in a Closed-Cell Aluminum by the Modification of Cellular Structure[J].Scripta Materialia,1999,41:1055. |
| [4] | 郑明军,何德坪.新型高强度胞状铝合金的压缩及能量吸收性能[J].材料研究学报,2002(05):473-478. |
| [5] | Deshpande V S;Fleck N A .High Strain Rate Compressive Behavior of Aluminum Alloy Foams[J].International Journal of Impact Engineering,2000,24:277. |
| [6] | Mukai T;Kanahashi H;Yamada Y .Dynamic Compressive Behavior of an Ultra-Lightweight Magnesium Foam[J].Scripta Materialia,1999,41:365. |
| [7] | Feng Y;Zhe Z G .Dynamic Compressive Behavior of Aluminum Alloy Foams[J].Journal of Materials Science Letters,2001,20:1667. |
| [8] | 刘剑飞;王正道;胡时胜 .The SHPB Experiment Technology for Low Wave Impedance Porous Materials[J].实验力学,1998,13:219. |
| [9] | Ashby M F;Medalist R F M .The Mechanical Properties of Cellular Solids[J].Metallurgical and Materials Transactions,1983,14A:1755. |
| [10] | Paul A;Ramamurty U .Strain Rate Sensitivity of a ClosedCell Aluminum Foam[J].Materials Science and Engineering,2000,A281:1. |
| [11] | Klintworth J W;Stronge W J .Elastic-Plastic Yield Limits and Deformation Laws for Transversely Crushed Honeycombs[J].International Journal of Mechanical Sciences,1988,30:273. |
| [12] | Philipse A P;Schram H L .Non-Darcian Airflow through Ceramic Foams[J].Journal of the American Ceramic Society,1991,74:728. |
| [13] | 曾德麟.粉末冶金材料[M].北京:冶金工业出版社,1989 |
| [14] | Gibson L J;Ashby M F.Cellular Solids:Structure andProperties[M].Cambridge:Cambridge University Press,1997 |
| [15] | 束德林.金属机械性能[M].北京:机械工业出版社,1983 |
| [16] | Olurin O B;Fleck N A;Ashby M F .Deformation and Fracture of Aluminum Foams[J].Materials Science and Engineering,2000,A291:136. |
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