Q235软钢在修正应力下断裂应变新模型  

New model of fracture strain of mild steel Q235 subjected to modified stress

作　　者：王蕊[1] 曹浩煜 

机构地区：[1]太原理工大学建筑与土木工程学院,山西太原030024

出　　处：《兰州理工大学学报》2015年第1期168-172,共5页Journal of Lanzhou University of Technology

基　　金：国家青年自然科学基金(51108296)

摘　　要：为准确确定Q235-B级钢在三轴应力下的断裂应变,进行五组共计10个具有不同凹陷半径试件的拉伸试验.在试验的基础上,对试件建立有限元分析模型,并进行详细的弹塑性大变形分析,给出试件中三轴应力的变化,并导出与三轴应力相关的真实塑性应变.得到Q235-B级钢的两个与真实断裂应变相关的塑性失效准则.In order to determine accurately the fracture strain of Q235-B-class steel subjected to triaxial stress,five groups of ten samples with different notch radii are tested on tensile deformation.A finite element analysis model is established for the sample on the basis of the test and detailed elastic-plastic largedeformation analysis is performed to given out the variation of triaxial stress in the sample and derive the true plastic strain related to the triaxial stress.Finally,two plastic failure criteria for Q235-B-class steel are obtained,which are related to the fracture strain.

关 键 词：塑性断裂 Q235钢材 三轴应力 断裂应变 

分 类 号：O346.1[理学—固体力学] U441.6[理学—力学]