期刊论文

Characterizations of Macroscopic Mechanical Properties of Metallic Foams by Classic Constitutive Models Under Triaxial Tension and Tension-Compression Loading

中文

南华大学学报(自然科学版)

1673-0062

2024

38

2

66-72

10.19431/j.cnki.1673-0062.2024.02.009

2018JJ3425:湖南省自然科学基金项目

本校为第一机构

泡沫金属在实际工程应用中往往承受多轴拉伸、拉压组合和压缩等复杂应力状态,且拉伸和压缩性能差异显著,而现有的本构关系理论模型基于多轴压缩实验构建,能否描述多轴拉伸和拉压组合条件下泡沫金属宏观弹塑性力学性能存疑.本文采用数值模拟的方法开展多轴加载数值仿真实验,基于数值模拟结果检验泡沫金属两个经典模型:D-F模型与汤立群等提出的理论模型(以下简称Tang模型),在三轴拉伸和拉压组合工况下的合理性.结果表明,D-F模型的椭圆度参数显著影响模型的预测精度,基于三轴拉伸、压缩和拉压组合屈服面拟合计算的椭圆度预测效果最优,结合单轴拉伸应力应变曲线,D-F模型能较好地表征泡沫金属三轴拉压...

Metallic foams are often subjected to multiaxial tension,tension-compression and compression loading in applications,and they exhibit significant asymmetry of tension and compression.The existed classic constitutive models of metallic foams well describe macroscopic mechanical properties under multiaxial compression loading,but it is still doubtful whether these models characterize mechanical behaviors under multiaxial tension and tension-compression loading.Series of simulations were conducted to obtain stresses and strains of metallic foams under triaxial tension,tension-compression,and comp...