镁合金负重轮动静态力学性能测试分析

• 作 者: 常旭青 张佳磊 杨勇彪
• 机 构: 中北大学软件学院,中北大学材料科学与工程学院,
• 出 处: 热加工工艺
• 发表日期: 2014年18期
• 关键词: 镁合金 重轮 AZ80镁合金 负重轮 变形行为 应变速率 高应变速率 最大应变 各向异性 应力-应变曲线

采用分离式Hopkinson压杆装置和Gleeble试验机,测试了挤压AZ80合金负重轮幅板在不同方向(与径向成0°、45°和90°)的准静态和动态压缩性能。结果表明:在试验范围内,AZ80合金的应力-应变曲线均具有弹塑性特征和应变硬化行为,表现出正的应变速率效应;应变速率从0.001~3000 s-1,三个方向的平均最大应力提高51.4%,平均最大应变提高124.6%;高、低应变速率下其力学行为有明显的各向异性,0°、45°和90°方向的应变速率敏感系数分别为0.00669、0.03189和0.03004。

The quasi-static and dynamic compressive properties of extruded AZ80 alloy load-bearing spoke plates in different directions (0 °, 45 ° and 90 ° to the radial) were tested using a split Hopkinson pressure bar and a Gleeble tester. The results show that the stress-strain curves of AZ80 alloy have elastoplastic characteristics and strain hardening behavior within the experimental range, showing a positive strain rate effect. The strain rate ranges from 0.001 to 3000 s-1 and the average maximum stress in three directions And the average maximum strain is increased by 124.6%. The mechanical behaviors of the specimens are obviously anisotropic at high strain rate and low strain rate. The strain rate sensitivity coefficients at 0 °, 45 ° and 90 ° are 0.00669, 0.03189 and 0.03004, respectively.