Shear Strength Measurements in LY-12 Aluminium Alloy During Shock Loading

Lateral stress of LY-12 alummium alloy under plate impact shock loading was measured. Based on the measured data, the Hugoniot relation and shear strength were obtained. The result has demonstrated that the shear strenath of the tested material increases remarkably with the increasing longitudinal stress. This means that the assumption of constant shear strength usually adopted in shock stress calculation is not suitable for the present material.

The Evolution of Fatigue bocks in Aluminum Alloy LY-12 under Shock beading

对LY12铝合金在低周疲劳条件下的裂纹情况和随后进行的动态拉伸条件下裂纹的发展给予了观察和统计分析。发现裂纹的累积数密度分布在损伤演化过程中保持指数形式,用NAG模型对实验结果进行分析,得出该材料裂纹演化发展方程的各种参数。

LY-12铝高温凝聚态动力学性质研究——高温冲塞剪切破坏强度的测量

本文介绍Ly-12铝合金从常温到400℃高温下,动态冲塞剪切破坏强度的测试及研究结果,并给出了该种材料静态压剪破坏强度的测量结果。在上述温度范围内,Ly-12铝的动态冲塞剪切破坏强度与其静态结果之比为1.3∶1～4∶1,表明随着温度的升高,动态的强度远大于同温度的静态结果。

LY-12铝高温凝聚态动力学性质研究——高温弹性模量的测定

金属材料的高温动态力学性能是材料科学领域中的重要方面。本文介绍LY-12合金铝在常温至450℃的温度区间内和动载下(应变率为 10~3/秒),材料弹性模量的研究。此项研究采用的试验装置为一维Hopkinson压杆及管式高温炉。应用一维弹性应力波传播理论,测得LY-12铝试件在不同温度T条件下的声速c(T),按照c(T)=[E(T)/ρ(T)]~(1/2),获得杨氏模量E(T)随温度的变化曲线。