A new simple and efficient method to determine critical strain required for adiabatic shear under high-speed impact  

一种简单有效确定高速冲击下绝热剪切临界应变的新方法

作　　者：Rui XING Peng-cheng GUO Cong-chang XU De-cheng WANG Luo-xing LI 邢瑞;郭鹏程;徐从昌;王德成;李落星(湖南大学机械与运载工程学院,长沙410082;湖南大学重庆研究院,重庆400044;中南林业科技大学机电工程学院,长沙410004)

机构地区：[1]College of Mechanical and Vehicle Engineering,Hunan University,Changsha 410082,China [2]Research Institute of Hunan University in Chongqing,Hunan University,Chongqing 400044,China [3]College of Mechanical and Electrical Engineering,Central South University of Forestry and Technology,Changsha 410004,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第2期418-430,共13页中国有色金属学报(英文版)

基　　金：National Natural Science Foundation of China (No. U20A20275);Natural Science Foundation of Hunan Province,China (No. 2021JJ40096)。

摘　　要：Based on the investigation of mechanical response and microstructure evolution of a commercial 7003 aluminum alloy under high-speed impact,a new simple and effective method was proposed to determine the critical strain required for the nucleation of adiabatic shear band(ASB).The deformation results of cylindrical and hat-shaped samples show that the critical strain required for ASB nucleation corresponds to the strain at the first local minimum after peak stress on the first derivative curve of true stress−true strain.The method of determining the critical strain for the nucleation of ASB through the first derivative of the flow stress curve is named the first derivative method.The proposed first derivative method is not only applicable to the 7003 aluminum alloy,but also to other metal materials,such as commercial purity titanium,WY-100 steel,and AM80 magnesium alloy.This proves that it has strong universality.基于对商用7003铝合金在高速冲击下的力学响应和显微组织演变的研究,提出一种简单有效的新方法来确定绝热剪切带(ASB)成核所需的临界应变。圆柱形和帽形样品的变形结果表明,ASB成核的临界应变对应真应力-真应变的一阶导数曲线上峰值应力后的第一个局部最小值。将这种通过流动应力曲线的一阶导数确定ASB成核临界应变的方法命名为一阶导数法。所提出的一阶导数法不仅适用于7003铝合金,也可用于其他金属材料,如商业纯钛、WY-100钢和AM80镁合金等。这证明一阶导数法具有很强的普适性。

关 键 词：critical strain adiabatic shear band high-speed impact microstructure evolution 7003 aluminum alloy 

分 类 号：TG146.21[一般工业技术—材料科学与工程]