三向应力度对船用钢三明治板激光焊焊接接头等效断裂应变的影响  

Influence of Triaxiality on Sandwich Plane Laser-welded Joint of Hull Steel to Equivalent Fracture Strain

作　　者：李金梅[1] 曹睿[1] 陈永[1] 朱亮[1] 陈剑虹[1] 

机构地区：[1]兰州理工大学甘肃省有色金属新材料省部共建国家重点实验室,兰州730050

出　　处：《中国机械工程》2014年第18期2523-2526,共4页China Mechanical Engineering

基　　金：国家自然科学基金资助重点项目(51035004)

摘　　要：为使船用钢CCS-B三明治板激光焊焊接接头在拉伸初期处于不同应力状态,设计了不同尺寸及缺口半径的试样,分别在平面应变、平面应力状态下获得不同的初始三向应力度,进而获得不同应力状态下的力学性能。试验结果表明:在进行拉伸试验时,试样无论是处于平面应力状态下还是平面应变状态下,随着初始三向应力度的减小,等效断裂应变增大,塑性变好;三向应力度与等效断裂应变之间均满足指数关系,即等效断裂应变随着三向应力度的增加呈现指数减小;断口形貌均为韧窝的韧性断裂形貌。In order to achieve mechanical property under different stress triaxiality at tensile test from sandwich plane laser-welded joint of hull steel CCS-B ,the flat grooved specimens with different radius and sizes were designed to study the effects of the stress triaxiality on the fracture plastic strain .The different stress triaxiality was determined by groove radii and the specimens＆#39;size .The re-sults indicate that ：whether the specimens are at the state of plane stress or plane strain ,the strength of welded joint increases and meanwhile the plastic of weld joint decreases with increasing of initial stress triaxiality .The relationship of the initial stress triaxiality and the equivalent strain to fracture were fitted using an exponential function .The fracture equivalent strain decreases with increasing of stress triaxiality .The fracture surface of specimens are mainly dominated ductile fracture with more dim ple .

关 键 词：三明治板 激光焊焊接接头 三向应力度 等效断裂应变 

分 类 号：TG156[金属学及工艺—热处理]