复杂应力状态下球墨铸铁断裂试验的断口分析  

The Fracture Analysis of Ductile Iron Fracture Test under Complex Stress Condition

作　　者：师俊平[1] 韩冬[1,2] 汤安民[1] 

机构地区：[1]西安理工大学理学院,陕西西安710054 [2]中国人民解放军陆军航空兵学院模拟训练中心,北京101123

出　　处：《西安理工大学学报》2009年第3期288-291,共4页Journal of Xi'an University of Technology

基　　金：陕西省自然科学基金资助项目(2007A17)

摘　　要：通过对复杂应力状态下LZQT400-15球墨铸铁断裂破坏试验试件断口的宏观以及细观分析,得到了不同应力状态下球墨铸铁的断裂形式:单向拉伸时为正断,单轴压缩时为无孔洞影响的剪切断裂,纯扭时为有孔洞影响的剪切断裂,拉/扭组合时为混合型断裂。探讨了各种断裂形式内在的断裂机理及裂纹的形成与扩展过程。Through the macroscopic and microscopic analysis of LZQT400-15 ductile iron fracture damage test specimen fracture under complex stress states, the fracture forms of ductile iron are obtained under the different stress condition：the unidirectional stretch can produce the traction fracture; the uniaxial compression can yield the shear fracture affected by non-holes; the pure torsion can produce the shesr fracture affected by holes ; and the combination of tension with torsion can give the mixed type of fracture. Also this paper discusses the intrinsic breakage mechanism of various forms of fractures and the formation and expansion process of the cracks.

关 键 词：球墨铸铁 复杂应力状态 断裂机理 裂纹扩展 

分 类 号：O346.1[理学—固体力学] TG143.5[理学—力学]