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。
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.
作者
宋鹏飞
曹秒艳
胡晗
陈吉业
付敏
Peng-fei SONG;Miao-yan CAO;Han HU;Ji-ye CHEN;Min FU(School of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;Hebei Light Structural Equipment Design and Manufacturing Technology Innovation Center,Yanshan University,Qinhuangdao 066004,China;School of Civil Engineering and Surveying,University of Portsmouth,Portsmouth PO13AH,UK)
基金
supported by the National Natural Science Foundation of China(Nos.51775480,51605420)
the Natural Science Foundation of Hebei Province,China(No.E2018203143)。
关键词
本构建模
超声振动
声软化行为
压缩
铜
constitutive modelling
ultrasonic vibration
acoustic softening behavior
compression
copper
