摘要
实施了不同振幅的超声振动辅助AZ31B镁合金板材拉伸试验研究材料的应力-应变关系,分析了超声振动对AZ31B板材力学性能的影响。结果表明,在不同的超声振幅下,超声振动同时具有软化效应和硬化效应。施加超声振动后,材料的流动应力瞬间出现不同程度的降低,当振幅增加到5.07μm时,伸长率和抗拉强度增加;当振幅继续增大时,材料的伸长率和抗拉强度下降。基于描述材料微观变形行为的经典本构理论建立了一种混合模型,其预测的镁合金板材拉伸应力-应变曲线与试验结果具有良好的一致性。
The ultrasonic assisted tensile tests of AZ31 B magnesium alloy sheet with different amplitudes were carried out to study the stress-strain relationship of the material and analyze the influence of ultrasonic vibration on the mechanical properties of AZ31 B sheet.The results show that with different ultrasonic amplitudes,ultrasonic vibration has both softening effect and hardening effect.The flow stress of the material instantly decreases in different degrees when the ultrasonic vibration is applied.When the amplitude increases to5.07μm,the elongation and tensile strength increase.When the amplitude continues to increase,the elongation and tensile strength decrease.Based on the classical constitutive theory describing microcosmic deformation behavior of the material,a hybrid model was established.The tensile stress-strain curves of magnesium alloy sheet predicted by the model are in good agreement with the test results.
作者
郑庭坚
张丽霞
廖娟
ZHENG Ting-jian;ZHANG Li-xia;LIAO Juan(School of Mechanical Engineering and Automation,Fuzhou University,Fuzhou 350116,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2020年第12期170-176,共7页
Journal of Plasticity Engineering
基金
国家自然科学基金资助项目(51805087)
福建省自然科学面上基金资助项目(2018J01761)。
关键词
超声振动
AZ31B镁合金
力学行为
本构建模
ultrasonic vibration
AZ31B magnesium alloy
mechanical behavior
constitutive modeling
