在闭孔泡沫铝的准静态压缩实验基础上，研究不同孔隙率下的力学性能和吸能性能，分析其压缩变形机理。结果表明，闭孔泡沫铝的压缩过程存在明显的3个阶段：线弹性阶段、塑性平台阶段和致密化阶段。随着孔隙率的增大，闭孔泡沫铝的屈服强度、弹性模量和压实应力均减小。在压缩过程中，吸能效率和理想吸能效率均是先上升后下降。孔隙率对吸能效率影响较大，对最大理想吸能效率影响不大。将理想吸能效率曲线和吸能效率曲线结合可以选择合适的缓冲材料，发挥其最佳吸能特性。闭孔泡沫铝在准静态压缩条件下有良好的塑性变形能力，变形呈逐层破坏的特征。
Based on the quasi-static compressive test of close-cell aluminum foam,mechanical properties and en-ergy absorption under different porosities were investigated and deformation mechanism was analyzed.Results showed that the quasi-static compressive process of closed-cell aluminum foam was characterized by three de-formation stages:linear elastic stage,plastic platform stage and densification stage.Yield strength,Young's modulus and compaction stress of closed-cell aluminum foam were both decreased with the increase of porosity. Energy absorption efficiency and ideal energy absorption efficiency were both increased and then decreased in the compressive process.Porosity had great impact on the absorption efficiency,while for maximum ideal energy absorption efficiency had little effect.Combine ideal energy absorption efficiency curves with energy absorption efficiency curve could select the appropriate cushioning material to bear the best energy absorption properties of aluminum foam.Close-cell aluminum foam had good plastic deformation capacity under quasi-static compres-sion.Deformation has characteristics that poles were destroyed layer by layer.
参考文献
| [1] | Saadatfar M;Mukherjee M.Structure and deformation correlation of closed-cell aluminum foam subj ect touniaxi-al compression[J].Acta Materialia,2012(60):3604-3615. |
| [2] | Ozturk U E;Anlas G .Energy absorption calculations in multiple compressive loading of polymeric foam[J].Ma-terials and Design,2009,30:15-22. |
| [3] | 范俊奇,辛凯,蔡灿柳,薛一江.泡沫材料准静态力学性能实验研究[J].实验力学,2011(02):139-145. |
| [4] | 王永,祖国胤,李兵,姚广春.颗粒增强铝合金基泡沫铝材料压缩性能的研究[J].功能材料,2008(07):1174-1176,1180. |
| [5] | 王永刚,王春雷.结构特征参数和应变速率对泡沫铝压缩力学性能的影响[J].兵工学报,2011(01):106-111. |
| [6] | 王鹏飞,徐松林,胡时胜.不同温度下泡沫铝压缩行为与变形机制探讨[J].振动与冲击,2013(05):16-19. |
| [7] | Mondal D P;Goel M D;Das S .Effect of strain rate and relative density on compressive deformation behavior of closed cell aluminum-fly ash composite foam[J].Materi-als and Design,2009,30:1268-1274. |
| [8] | Shi Shaoqing;Kang Jiangong;Sui Shunbin .Experimental study of quasi-static and dynamic compressive property of close-cell aluminum foam[J].RARE METAL MATERIALS AND ENGINEERING,2011,40(z2):150-154. |
| [9] | 谭柱华,陈晨,韩旭,王甫瑞.泡沫铝硅合金动态压缩力学性能及吸能特性研究[J].工程力学,2013(02):360-364. |
| [10] | Yongliang Mu;Guangchun Yao;Lisi Liang;Hongjie Luo;Guoyin Zu .Deformation mechanisms of closed-cell aluminum foam in compression[J].Scripta materialia,2010(6):629-632. |
| [11] | Song HW;Fan ZH;Yu G;Wang QC;Tobota A .Partition energy absorption of axially crushed aluminum foam-filled hat sections[J].International Journal of Solids and Structures,2005(9/10):2575-2600. |
| [12] | Miltz J;Gruenbaum G .Evaluation of cushion properties of plastic foams compressive measurements[J].Poly-mer Eng Sci,1981,21(15):1010-1014. |
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