摘要
采用分离式霍普金森压杆系统和高温设备对ZL101A铝合金进行了常温和高温下的动态压缩实验,得到了应变率范围为2900~6100 s^(−1)、温度范围为20~600℃的动态压缩应力-应变曲线。实验结果表明:ZL101A铝合金具有应变率硬化效应,并且随着温度的升高,应变率硬化效应减弱;ZL101A铝合金在不同应变率下均存在明显的温度软化效应,且随着温度的升高,塑性变形引起的绝热温升使热软化作用增强。为了得到应变率和温度对材料流变应力的影响,将应变率效应和温度效应进行解耦,得到一种适用于ZL101A铝合金材料的动态本构模型。对比模型预测结果与实验数据发现,建立的本构模型可以很好地描述ZL101A铝合金的流变应力特征。
The dynamic compression experiments of ZL101A aluminum alloy were carried out under room and high temperature conditions by using split Hopkinson pressure bar(SHPB)system and high temperature heating equipment.The dynamic compressive stress-strain curves under the conditions of strain rate range of 2900−6100 s^(−1) and temperature range of 20−600℃were obtained.The experimental results show that ZL101A aluminum alloy has a strain rate hardening effect,and the strain rate hardening effect gradually decreases with the increase of temperature.Meanwhile,ZL101A aluminum alloy has obvious temperature softening effect at different strain rates,and the plastic deformation induced adiabatic temperature rise enhances the thermal softening effect.In order to quantify the influences of strain rate and temperature on the flow stress of ZL101A aluminum alloy,the strain rate effect and the temperature effect were decoupled.A suitable constitutive model for ZL101A aluminum alloy was established by analyzing and fitting the experimental data.After comparing the predicted results from the model with the experimental data,it was found that the established constitutive model can well describe the flow stress characteristics of ZL101A aluminum alloy.
作者
张延泽
秦健
孟祥尧
刘元凯
文彦博
黄瑞源
ZHANG Yanze;QIN Jian;MENG Xiangyao;LIU Yuankai;WEN Yanbo;HUANG Ruiyuan(National Key Laboratory of Transient Physics,Nanjing University of Science and Technology,Nanjing 210094,Jiangsu,China;College of Civil Engineering,Fuzhou University,Fuzhou 350000,Fujian,China;Naval Research Academy,Beijing 100161,China)
出处
《高压物理学报》
CAS
CSCD
北大核心
2022年第3期86-96,共11页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(12172178,11802001)
装备预研基金(614260404021801)
中国空气动力研究与发展中心超高速碰撞中心开放基金(20200203)。
关键词
ZL101A铝合金
高应变率
流变应力
高温
霍普金森压杆
ZL101A aluminum alloy
high strain rate
flow stress
high temperature
split Hopkinson pressure bar
