Compressive behavior of aluminum foams at low and high strain rates
Compressive behavior of aluminum foams at low and high strain rates
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DOI：
10.1007/s11771-007-0269-8
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发表时间：
2007-02
影响因子：
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通讯作者：
Ying-an Kang;Jun-yan Zhang;Jia-cai Tan
中科院分区：
文献类型：
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作者：
Ying-an Kang;Jun-yan Zhang;Jia-cai Tan
研究了开孔和闭孔两种不同密度泡沫铝在室温和压缩载荷下的力学行为。在1.0 × 10 − 3~1.6 × 103s − 1的应变率范围内测试了它们对应变率的响应。动态压缩试验采用分离式霍普金森压杆（SHPB），准静态压缩试验采用位移控制式CMT 5305。实验结果表明，在此范围内，泡沫铝的压缩应力-应变曲线均存在三个变形区，即线弹性区、塌陷区和致密区。泡沫铝的强度随着相对密度的增加而增加，并且远低于Gibson-Ashby理论的预测。对于开孔泡沫，应力对应变率敏感。然而，闭孔泡沫的应力表现出很少或没有应变速率敏感性。两种不同孔结构的泡沫铝在压缩试验中表现出不同的变形模式。在闭孔泡沫的变形期间，变形在空间上是不均匀的。而开孔泡沫塑料没有明显的塌陷带，塑性变形是均匀的。
The mechanical behavior of two aluminum foams including open cells and closed cells with a variety of densities at room temperature and under compression loading was studied. Their response to strain rate was tested over a wide range of strain rates, from 1.0×10−3to 1.6×103s−1. The dynamic compression tests were made by Split Hopkinson Pressure Bar (SHPB) and the quasi-static tests were conducted using a displacement controlled CMT5305. Within this range, the experimental results show that all the compressive stress-strain curves of aluminum foams have three deforming regions such as linear elastic region, collapse region, and densification region. Aluminum foams have strengths that increase with increasing relative density and fall well below predictions of the Gibson-Ashby theory. For the open cell foam the stress is sensitive to the strain rate. However, the stress of the closed cell foam exhibits little or no strain rate sensitivity. Two aluminum foams with different cell structures exhibit different deforming models in the compressive tests. During the deformation of closed cell foams the deformation is not spatially uniform. However, there is no apparent collapse band and plastic deformation is homogeneous for open-cell foams.