Study on the Compression Properties and Deformation Failure Mechanism of Open-Cell Copper Foam
Study on the Compression Properties and Deformation Failure Mechanism of Open-Cell Copper Foam
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开孔泡沫铜压缩性能及变形破坏机理研究
DOI：
10.1002/adem.201600861
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发表时间：
2017-11-01
影响因子：
3.6
通讯作者：
Ren, Yanjie
中科院分区：
文献类型：
--
作者：
Chen, Jian;Li, Xiongfei;Ren, Yanjie
对开孔泡沫铜在10（-2）s（-1）、10（-3）s（-1）和10（-4）s（-1）应变速率下进行了单轴压缩实验，获得了真应力-应变曲线。研究了应变速率、胞尺寸和孔隙率对力学性能的影响。通过实验研究和有限元分析，对开孔泡沫铜的变形机理进行了研究。结果表明，随着应变速率的增大，孔隙率和泡孔尺寸的减小，压缩强度、弹性模量和屈服强度均增大。较低的应变速率导致较高的应变灵敏度。在高应变率加载过程中，合金发生了应变硬化行为。实验和模拟结果表明，开孔泡沫铜的失效机理为逐层坍塌失效，在薄弱孔处容易形成应力集中。在第一、第二阶段，模拟结果与实验数据基本一致。然而，在第三阶段的模拟预测的真应力值略高于实验。
Uniaxial compression experiments on open-cell copper foams are conducted at strain rates of 10(-2)s(-1), 10(-3)s(-1), and 10(-4)s(-1) to obtain the true stress-strain curves. The effects of the strain rate, cell size, and porosity on the mechanical properties is studied. The deformation mechanism of the open-cell copper foams is investigated by experimental research and finite element analysis. The results showed that the compression strength, Young's modulus and yield strength increase with increasing strain rate and decreasing porosity and cell size. A lower strain rate results in higher strain sensitivity. Strain-hardening behavior occurred in the process of high-strain-rate loading. The experimental and simulation results indicate that the failure mechanism of the open-cell copper foam is the layer-by-layer collapse failure mechanism and that stress concentrations form easily at the weak pore struts. The simulation results are consistent with the experimental data at the first and second stages. However, the value of true stress predicted by the simulation at the third stage is slightly higher than that of the experiments.