火炸药学报2023，Vol.46Issue(12)：1093-1099,7.DOI:10.14077/j.issn.1007-7812.202303007
不同壁厚下40CrMnSiB钢柱壳内爆炸膨胀裂纹生成机制分析
The Formation Mechanism Analysis of Explosion Expansion Crack of 40CrMnSiB Steel Cylindrical Shell with Different Wall Thicknesses
摘要
Abstract
Aiming at the expansion fracture mechanism of projectile steel shell under implosion loading,the smooth particle flu-id dynamics method(smoothed particle hydrodynamics,SPH)was used to simulate the expansion fracture process and crack dis-tribution law of 40CrMnSiB steel cylindrical shell with several wall thicknesses under implosion loading.The comparative exper-imental study was carried out by using the explosive water well recovery technology,and the crack formation mechanism was analyzed by combining the macroscopic morphology and microstructure of the cylindrical shell fracture fragments.The results show that the fracture mode of 40CrMnSiB steel cylindrical shell gradually changes from pure shear to tension-shear mixing with the increase of wall thickness.When the wall thickness of the cylindrical shell increases from 4 mm to 17 mm,the proportion of tension cracks gradually increases from 0 to 4/5,and the circumferential density of the cylindrical shell cracks and the total number of fragments formed decrease by 54.54％and 67.06％,respectively.With the increase of the wall thickness of the metal cylindrical shell,the mass distribution of the final fragments gradually disperses.By analyzing the microstructure of the re-covered fragments,it is found that the fracture of the cylindrical shell is actually the result of the interaction and competition between the shear cracks generated on the inner surface of the shell and the tension cracks generated on the outer surface,and there is a phenomenon of mutual shielding between the cracks.关键词
爆炸力学/爆炸载荷/断裂机制/光滑粒子流体动力学/SPH/40CrMnSiB钢Key words
explosion mechanics/explosive loading/fracture mechanism/smoothed particle hydrodynamics/SPH/40CrMnSiB steel分类
军事科技引用本文复制引用
刘哲,李伟兵,罗渝松,王晓鸣,李文彬..不同壁厚下40CrMnSiB钢柱壳内爆炸膨胀裂纹生成机制分析[J].火炸药学报,2023,46(12):1093-1099,7.基金项目
国家自然基金面上项目(No.11972018) （No.11972018）
