开孔与闭孔泡沫铝的压缩力学行为.pdfVIP

• 122 • 材料导报 2005 年 8 月第 19 卷第 8 期 开孔与闭孔泡沫铝的压缩力学行为铃 康瓶安1 ， 2 张俊彦2 (1 湖南工程学院机电工程系，湘潭 411101; 2 湘潭大学基础力学与材料工程研究所，湘穰411105 ) 摘要 研究了开孔与闭孔两种胞孔结构不同、制备工艺不同的泡沫铅在准静态乐缩载荷下的压缩响应曲线。 结果表明:开孔与闭孔泡沫铭压缩应力成交曲线均具有多孔泡沫材料明泉的三阶段特征，lIp 线弹性段、搜性屈服平台 段Â致密段:相对密度对泡沫材料的力学性能(如杨氏模爱、屈服强度)有很大影响;在准静态下，开孔泡沫铭表现出明 显的应变卒效应，而闭孔泡沫不如升孔敏感;泡沫铭材料表现为弱的各向异性;胞孔结构影响两种泡沫材料的压缩响 应曲线。 关键词 泡沫铝压缩应力w应变曲线相对密度应变率效应 Uniaxial Compressive Behavior of Open-cell and Closed…cell Aluminum Foams KANG Yingan1 ,Z ZHANG Junyan2 (1 Department of Mechanics Engineering , Hunan Institute of Engineering , Xiangtan 411101; 2 Institute of Fundamental Mechanics . Material Engine巳ring ， Xiangtan University , Xiangtan 411105) Abstract The compressìve properties of an open-cell and a closed白cell aluminum foams with a variety of den喇 叭tÎes are measured. It is found that the compressive stress吩train curves of aluminum foams all have three deforming regions such as elasticity region. plastic collapsing region and densification region. Relative density mainly affects the compressive properties. In the quasi-static compressive test , open-cell aluminum foams e对1ibits apparent strain rate sensitivity. but closed-cell aluminum foams are inferior. The foams are anisotropic. And different cell shapes have an effect on the compressive stress幡strain response of aluminum foams. Key words aluminum pressive stress-strain curves.relative density ,strain rate sensitivity 1 实验方法 。 前吉 实验所用的炮沫铝由安徽淮北虹披炮沫金属有限公司生 油沫铝是一种以铝戒铝合金为骨架，食大最脚孔的三三维多 产，开孔泡沫铝用渗流法制备，而闭孔泡沫铝采用发泡法制备。 胞金崩泡沫材料，它有闭孔(closed-cell