Indentation responses of closed-cell aluminum foams at elevated temperatures
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摘要: 通过不同形状(平头和半球头)的压头在不同温度下对闭孔泡沫铝材料进行塑性压入实验，研究不同温度下闭孔泡沫铝的压入变形模式及载荷响应特性。并基于闭孔泡沫铝在高温下的准静态塑性压入载荷响应的实验结果，结合多种分析方法，(如量纲分析和有限元计算等)，探索既考虑温度影响也包含压入深度影响的预测闭孔泡沫铝平头和半球头压入力学响应的经验公式。结果表明，本文得到的两种压头情况下的经验公式都能够较好地预测闭孔泡沫铝在不同温度下的压入力学响应。Abstract: Indentation responses and deformation characteristics of closed-cell aluminum foams under elevated temperatures were experimentally investigated by using a flat-ended punch (FEP) and a hemispherical-ended punch (SEP). Based on the quasi-static experimental results at elevated temperatures, dimensional analysis and finite element simulations are used to examine the empirical relations of the SEP and FEP indentation load responses and the indentation depth and test temperature. The theoretical predictions based on the results of the analysis are compared with the experiments. It was found that the load responses are described well by the empirical formulas for different indenters at different temperatures. This provides the basis for applying a simple indentation test to investigate the mechanical properties of metallic foams.
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Key words:
- solid mechanics /
- load responses /
- indentation test /
- aluminium foam /
- high temperature
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图 1 压入实验后的横截面图
Figure 1. Cross-sectional photographs of the specimens after indentation experiment
图 2 不同温度下闭孔泡沫铝的压入载荷位移曲线
Figure 2. Load-displacement curves of closed-cell aluminum foam at different temperatures under indentation
图 3 FEP压入载荷理论预测值与实验结果比较
Figure 3. Comparison between the FEP indentation load responses of closed-cell aluminum foam from experiments and predictions at different temperatures
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