Ballistic impact response of resistance-spot-welded(RSW) double-layered plates for Q&P980 steel

作     者：Bo-han Ma Dong-fang Ma Huan-ran Wang Da-nian Chen Feng-hua Zhou Bo-han Ma;Dong-fang Ma;Huan-ran Wang;Da-nian Chen;Feng-hua Zhou

作者机构：MOE Key Laboratory of Impact and Safety EngineeringNingbo UniversityNingbo315211China College of Science&TechnologyNingbo UniversityNingbo315211China 

出 版 物：《Defence Technology（防务技术）》 (Defence Technology)

年 卷 期：2022年第18卷第6期

页      面：1052-1064页

核心收录：

学科分类：08[工学] 0826[工学-兵器科学与技术] 

基　　金：supported by the National Natural Science Foundation of China,China under the grant No.11372149 K.C.Wong Magna Fund in Ningbo University 

主　　题：RSW Q&P980 steel Ballistic impact Deformation Fracture 

摘      要：Ballistic impact response of resistance-spot-welded(RSW)double-layered(2×1.6 mm)plates(190 mm×150 mm)for Q&P980 steel impacted by a round-nosed steel bullet(12 mm diameter and 30 mm length)was investigated by using gas gun and high-speed camera *** RSW specimens were spot welded using a 6 mm diameter electrode face producing a 7.2 mm diameter fusion zone of the spot *** ballistic curve and energy balance for the tests of the spot weld of the RSW specimens at different velocity were analyzed to characterize the ballistic behavior of the RSW specimens under bullet *** fracture mechanisms of the RSW specimens under bullet impact were *** the tests below the ballistic limit,the cracks initiated from the notch-tip and propagated along the faying surface or obliquely through the thickness depending on the impact *** the tests above the ballistic limit,the plug fracture in the front plate of the RSW specimen could be caused by the thinning-induced necking in the BM near the HAZ,while the plug fracture in the rear plate of the RSW specimens may be consist of the circumferential cracking from the rear surface and the bending fracture of the hinged part of *** effects of the electrode indentation and the weld interfaces on deformation and fracture of the RSW specimens under bullet impact were *** the tests above the ballistic limit,the circumferential fracture from the rear surface of the RSW specimens was always initiated along the interior periphery of the electrode indentation and the crack paths were along the FZ/CGHAZ or CGHAZ/FGHAZ *** the circumferential crack also formed outside the electrode indentation,the fracture on the BM/HAZ interface could be *** the front plate of the RSW specimens,the shear/bending induced cracking from the notch-tip were observed and the crack paths were along the FZ/CGHAZ or CGHAZ/FGHAZ interface.