超声振动下FCC金属统一本构模型及其在无氧高导热铜的应用
A unified constitutive model of FCC metal in ultrasonic vibration with application to oxygen-free high-thermal conductivity copper
宋鹏飞 1曹秒艳 1胡晗 1陈吉业 2付敏1
作者信息
- 1. 燕山大学机械工程学院,秦皇岛 066004;燕山大学河北省轻质结构装备设计与制备工艺技术创新中心,秦皇岛 066004
- 2. School of Civil Engineering and Surveying,University of Portsmouth,Portsmouth PO1 3AH,UK
- 折叠
摘要
建立统一本构模型,预测面心立方金属(FCC)超声振动(UV)辅助成形塑性流动行为.该模型基于超声能场下的位错动力学并结合应力叠加机制描述UV软化行为.考虑位错密度、晶粒尺寸和超声能场的相互作用,以位错密度和晶粒尺寸作为内部状态变量建立模型,预测UV辅助成形的残余行为.开展无氧高导热(OFHC)铜UV辅助压缩试验来验证该模型的预测能力.结果表明,OFHC铜在UV下表现出明显的软化行为和残留软化行为,模型预测与实验结果吻合较好,有效反映铜的软化效应和残余效应.
Abstract
A unified constitutive model is established to predict the plastic flow behavior of face-centered cubic(FCC)metal in the ultrasonic vibration(UV)assisted forming.The model describes UV softening behavior based on the dislocation dynamics in the UV combined with the stress superposition mechanism.The interaction among dislocation density,grain size and UV is considered,and the residual behavior of UV-assisted forming can be predicted by modelling with dislocation density and grain size as internal state variables.UV-assisted compression tests were performed on oxygen-free high-thermal conductivity(OFHC)copper to verify the predictive ability of the model.The results show that OFHC copper exhibits obvious softening behavior and residual softening behavior in the UV.The model prediction is in good agreement with the experimental result,which effectively captures the softening effect and residual effect of copper.
关键词
本构建模/超声振动/声软化行为/压缩/铜Key words
constitutive modelling/ultrasonic vibration/acoustic softening behavior/compression/copper引用本文复制引用
基金项目
National Natural Science Foundation of China(51775480)
National Natural Science Foundation of China(51605420)
Natural Science Foundation of Hebei Province,China(E2018203143)
出版年
2024
NETL
NSTL
万方数据