加载速率对6020铝合金材料力学性能影响的实验研究

通过拉伸实验研究了加载速率在1mm/min, 10mm/min, 100mm/min以及200mm/min范围内6020铝合金材料的力学性质,结果表明这种材料有近似于理想弹塑性的性质,应力-应变曲线明显地表现为线弹性和线塑性的特点,而且加载速率对于该铝合金材料的力学性质没有明显的影响.作为对比还测试了45#中碳钢在相同的加载速率条件下的力学特性,得出随着加载速率的增加,无论屈服强度还是抗拉强度均有一定的提高,塑性有了一定的降低.最后,根据实验结果确定了该铝合金材料的本构关系.

Effect of Loading Rate on the Tensile Properties of 6020 Aluminum Alloy

The tensile mechanical properties of 6020 aluminum alloy under the loading rates, 1mm/ min, 10mm/min, 100mm/min and 200mm/min were obtained using an universal test machine. The results showed that its mechanical properties approached to ideal plastoelasticity, and its stress-strain relationship presented the characteristic of linear-elastic and linear-plastic. Its mechanical properties were not strongly influenced by the loading rates. As a comparison, a type of 45 steel is tested under the same experimental conditions. It showed that, with the enhancement of the loading rates, the yield strength and tensile strength increased while the elongation decreased. Finally, the constitutive relation of this alloy aluminum was constructed based on the experimental results.