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高速冲击载荷下WE43镁合金的动态力学响应行为

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采用分离式霍普金森压杆和多种显微表征方法研究了两种固溶温度下挤压WE43 镁合金的室温动态力学响应行为,应变速率为 2580～4120 s-1.结果表明,在高速冲击载荷下,形变孪晶具有较强的正应变速率敏感性,以致流变应力随应变速率的增加而增加.形变孪晶在变形中前期随应变的增加迅速增殖,使得其应变硬化率在应变为 0.03～0.10 时呈"驼峰"状.基面滑移和孪生相协调是高速冲击载荷下挤压态WE43 镁合金的主导塑性变形机制.采用多项式修正了原始J-C本构模型,构建了能够准确描述挤压态WE43 镁合金动态力学响应行为的本构模型.本构拟合结果与实验结果的偏差在±10%以内,其相关系数R和平均绝对相对误差eAARE 分别为 0.962 和 3.21%.
Dynamic mechanical response behavior of WE43 magnesium alloy under high-speed impact load
The dynamic mechanical response behaviors of extruded WE43 magnesium alloy at room temperature at two solution temperatures were investigated by using split-Hopkinson pressure bar and various microcharacterization methods with strain rates of 2580-4120 s-1.The results show that the deformation twins show strong positive strain rate sensitivity under high-speed impact load,resulting in the increase of flow stress with the increase of strain rate.The deformation twins increase rapidly with the increase of strain in the middle and early stage,which makes the strain hardening rate exhibit"hump"shape with strain of 0.03-0.10.The coordination of base slip and twinning is the dominant plastic deformation mechanism of the extruded WE43 magnesium alloy under high-speed impact load.The original J-C constitutive model was modified by polynomials,and the constitutive model that can accurately describe the dynamic mechanical response behavior of the extruded WE43 magnesium alloy was constructed.The deviation between the constitutive fitting results and the test results is within±10%,and the correlation coefficient R and the average absolute relative error eAARE are 0.962 and 3.21%,respectively.

WE43 magnesium alloyhigh-speed impactmechanical behaviorconstitutive modeling

郭鹏程、蒋子涵、秦思晓、肖罡、刘志军、柳青

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中南林业科技大学 机电工程学院,湖南 长沙 410004

中国机械总院集团北京机电研究所有限公司,北京 100083

江西铜业技术研究院有限公司,江西 南昌 330096

江西工业工程职业技术学院 机械工程学院,江西 萍乡 337099

豪斯特热冲压技术有限公司,广东 东莞 523507

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WE43镁合金 高速冲击 力学行为 本构建模

国家自然科学基金资助项目江西省自然科学基金资助项目江西省高层次高技能领军人才培养工程项目湖南省自然科学基金资助项目长沙市科技计划项目省部共建特色金属材料与组合结构全寿命安全国家重点实验室开放基金资助项目

5207515920224ACB2180022022JJ30019kq22084202022GXYSOF24

2024

10.3969/j.issn.1007-2012.2024.08.018

塑性工程学报
中国机械工程学会

塑性工程学报

CSTPCD北大核心
影响因子：0.46
ISSN：1007-2012
年,卷(期)：2024.31(8)
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