锥形压头压缩下泡沫铝的力学性能

Mechanical Properties of Al Foams Subjected to Compression by a Cone-Shaped Indenter.

作者信息

Wang Xinjie, Wang Xinzhu, Jian Kailin, Xu Linji, Ju Anqi, Guan Zhongwei, Ma Li

机构信息

College of Aerospace Engineering, Chongqing University, Chongqing 400040, P. R. China.

Faculty of Environment and Ecology, Chongqing University, Chongqing 400040, P. R. China.

出版信息

ACS Omega. 2021 Oct 15;6(42):28150-28161. doi: 10.1021/acsomega.1c04217. eCollection 2021 Oct 26.

DOI:10.1021/acsomega.1c04217

PMID:34723013

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8552331/

Abstract

Indentation tests and numerical simulations were conducted to investigate the effects of the indenter parameters (diameter and cone angle) and the relative density of Aluminum (Al) foams on the deformation mechanism of closed-cell Al foams, load response, and energy-absorbing capability. The results demonstrated that the densification occurred below the indenter, and cell tearing and bending occurred on both sides of the indenter, while the lateral plastic deformation insignificantly took place during the indentation tests. The load response and absorbed energy per unit volume dramatically increased with the cone angle of the indenter and the relative density of Al foams. However, the load response slightly increased but the absorbed energy per unit volume linearly decreased with the diameter of the indenter. Interestingly, the energy-absorption efficiency was independent of the diameter and cone angle of the indenter, and the relative density of Al foams as well. Our results suggest the indentation tests are recommended approaches to reflect the mechanical properties of closed-cell Al foams.

摘要

进行了压痕试验和数值模拟，以研究压头参数（直径和锥角）以及泡沫铝（Al）的相对密度对闭孔泡沫铝变形机制、载荷响应和能量吸收能力的影响。结果表明，致密化发生在压头下方，压头两侧发生孔胞撕裂和弯曲，而在压痕试验过程中横向塑性变形不明显。单位体积的载荷响应和吸收能量随压头锥角和泡沫铝的相对密度显著增加。然而，载荷响应略有增加，但单位体积的吸收能量随压头直径线性降低。有趣的是，能量吸收效率与压头的直径和锥角以及泡沫铝的相对密度无关。我们的结果表明，压痕试验是反映闭孔泡沫铝力学性能的推荐方法。