多轴非比例载荷下镁合金AZ21的疲劳性能研究
发布时间：2018-09-13 10:59
【摘要】：镁合金作为结构件承受多轴复杂载荷,其失效形式多为多轴疲劳失效.本文在空气环境中对镁合金AZ21分别进行了单轴、纯扭以及多轴循环力学性能研究,揭示了不同加载路径下材料的变形主导机制.疲劳试验结果表明,在相同等效应力幅下,非比例加载路径下镁合金AZ21的寿命较单轴、纯扭路径显著降低.采用Basquin公式预测镁合金AZ21在复杂载荷下的疲劳寿命.通过将路径非比例度的概念引入到Basquin公式中,可合理预测相同加载幅值下圆形路径和菱形路径作用时镁合金AZ21的疲劳寿命.
[Abstract]:Magnesium alloy as a structural part is subjected to complex multiaxial loading, and its failure form is mostly multiaxial fatigue failure. In this paper, uniaxial, pure torsional and multiaxial cyclic mechanical properties of magnesium alloy AZ21 were investigated in air environment, and the deformation mechanism of magnesium alloy AZ21 under different loading paths was revealed. The fatigue test results show that under the same equivalent stress amplitude, the life of magnesium alloy AZ21 under non-proportional loading path is significantly lower than that of uniaxial, and the pure torsion path is significantly reduced. The fatigue life of magnesium alloy AZ21 under complex load was predicted by Basquin formula. By introducing the concept of path non-proportionality into the Basquin formula, the fatigue life of magnesium alloy AZ21 under the same loading amplitude can be reasonably predicted under the action of circular path and rhombus path.
【作者单位】： 天津大学化工学院;天津大学仁爱学院;
【基金】：国家自然科学基金资助项目(11172202) 教育部新世纪优秀人才资助项目(NCET-13-0400)~~
【分类号】：TG146.22
本文编号：2240982
[Abstract]:Magnesium alloy as a structural part is subjected to complex multiaxial loading, and its failure form is mostly multiaxial fatigue failure. In this paper, uniaxial, pure torsional and multiaxial cyclic mechanical properties of magnesium alloy AZ21 were investigated in air environment, and the deformation mechanism of magnesium alloy AZ21 under different loading paths was revealed. The fatigue test results show that under the same equivalent stress amplitude, the life of magnesium alloy AZ21 under non-proportional loading path is significantly lower than that of uniaxial, and the pure torsion path is significantly reduced. The fatigue life of magnesium alloy AZ21 under complex load was predicted by Basquin formula. By introducing the concept of path non-proportionality into the Basquin formula, the fatigue life of magnesium alloy AZ21 under the same loading amplitude can be reasonably predicted under the action of circular path and rhombus path.
【作者单位】： 天津大学化工学院;天津大学仁爱学院;
【基金】：国家自然科学基金资助项目(11172202) 教育部新世纪优秀人才资助项目(NCET-13-0400)~~
【分类号】：TG146.22
【相似文献】
相关期刊论文 前1条
1 杨续跃;孙欢;吴新星;马继军;秦佳;霍庆欢;;AZ21镁合金降温多向压缩过程中的组织和微观织构演化[J];金属学报;2012年02期
相关硕士学位论文 前3条
1 邓玲;电流脉冲改善AZ21镁合金电池电压滞后的研究[D];重庆大学;2015年
2 崔云;镁合金AZ21在复杂载荷和腐蚀环境下的疲劳性能研究[D];天津大学;2015年
3 吴新星;温度对多向压缩AZ21镁合金晶粒细化及退火行为的影响[D];中南大学;2012年
，本文编号：2240982
本文链接：https://www.wllwen.com/kejilunwen/jiagonggongyi/2240982.html
