壁厚对HR2钢柱壳爆轰加载下膨胀断裂行为的影响  

Effect of Shell Thickness on Expanding Fracture Behavior of HR2 Steel Cylinders under Explosive Loading

作　　者：卢秋虹[1] 王宁 范诚[3] 申勇峰 刘明涛[3] 汤铁钢[3] 胡海波[3] LU Qiuhong;WANG Ning;FAN Cheng;SHEN Yongfeng;LIU Mingtao;TANG Tiegang;HU Haibo(Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]中国科学院金属研究所沈阳材料科学国家研究中心,沈阳110016 [2]东北大学材料科学与工程学院,沈阳110819 [3]中国工程物理研究院流体物理研究所,绵阳621900

出　　处：《材料研究学报》2020年第4期241-246,共6页Chinese Journal of Materials Research

基　　金：国家自然科学基金(U1530146,11602249,U1730140).

摘　　要：通过对6、12 mm两种不同壁厚的HR2钢柱壳进行爆轰加载实验,对其断裂碎片的宏观形貌、断口的微观形貌以及横截面的变形微观结构进行系统表征,研究了金属柱壳在爆轰加载下的膨胀断裂机理。结果表明,在膨胀断裂过程中壳壁厚度的增大导致HR2钢柱壳由纯剪切断裂变为拉剪混合的断裂模式。断裂碎片的微观结构分析结果表明,柱壳的断裂实际上是剪切裂纹从样品内部剪切带形核并扩展、和拉伸裂纹沿柱壳外表面的形核扩展的共同作用及竞争的结果。薄壁柱壳断裂由样品内裂纹沿剪切带的形核和扩展主导发生剪切断裂,而厚壁柱壳中内侧的裂纹沿剪切带的形核和扩展,但是最外侧则为环向拉应力主导发生拉伸断裂,因此表现出拉剪结合的断裂模式。To clarify the fracture mechanism of metal cylinder under explosive loading, HR2 steel cylinders with shell of 6 and 12 mm in thickness respectively were subjected to explosive loading. The fracture fragments were collected after explosion, and then systematically investigated in terms of macroscopic morphology, fracture morphology and deformation microstructure. It is found that when the shell thickness increases, the fracture mode of HR2 cylinder changed from shearing fracture to the mixture of shearing fracture and tensile fracture. The deformation microstructure observation indicates that the failure and fracture of cylinder shell are the result of the combination and competition of cracks-nucleating and-expanding from the shear band and from the outer surface. The fracture of thin cylinder is dominant by the cracks nucleating and expanding from the shear band, presenting shearing fracture mode. The fracture of thick cylinder is the combined action of cracks-nucleating and-expanding from the shear band and from the outer surface, presenting a mode of mixture of shear-and tensile-fracture.

关 键 词：金属材料 HR2钢 爆轰加载 膨胀断裂 微观结构 剪切带 断裂机理 

分 类 号：TG142[一般工业技术—材料科学与工程]