双孔微剪切法评定焊接接头的局部强度  

Evaluating Local Strength of Welded Joint by Using Double Hole Micro-shear Method

作　　者：蔡淑娟[1] 朱亮[1] 郝建明[1] 

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050

出　　处：《热加工工艺》2015年第21期168-171,共4页Hot Working Technology

摘　　要：本文提出一种双孔微剪切在线测量方法。在不破坏待测体的前提下测试其力学性能。此方法无需制备试样,直接在被测材料区域两侧打两个直径为6 mm的孔进行剪切试验。Labv IEW软件控制部分输出加载过程中载荷传感器和位移传感器传输的数据,得到剪切载荷-位移曲线,经转化可获得屈服剪切应力和最大剪切应力。对X70管线钢轧制板和6063铝合金母材进行单轴拉伸试验和双孔微剪切试验,并给出屈服强度和抗拉强度值。对比两种材料的屈服剪应力与屈服强度、最大剪应力与抗拉强度,建立它们之间的相关性。最后利用双孔微剪切试验测定焊接接头上强度的分布,并分别与其硬度(HV)做对比,得出强度和硬度的分布关系。The double hole micro-shear on-line measuring system was presented. The mechanical properties of the body which did not damage were tested. This system requires no sample preparation, in the material under test area to drill two 6 mm diameter hole on both sides, the device is fixed. LabvIEW software records the data which can be obtained in the process of loading from load and displacement sensor transmission part. Then, the shear load-displacement curve can be gotten. The yield shear stress and maximum shear stress can be obtained. X70 pipeline steel rolling board and 6063 aluminum material are subjected to uniaxial tensile test and double hole micro-shear test （DHMS）, then, the yield strength and tensile strength, yield shear stress and maximum shear stress of two kinds of materials were compared, then, the correlation between them was obtained respectively. Finally, the distribution of two kinds of materials on the determination of joint strength was tested using DHMS, which was compared with hardness （HV）, then, the relationship between strength and hardness distribution was obtained.

关 键 词：双孔微剪切装置 局部强度 屈服强度 屈服剪切应力 

分 类 号：TG407[金属学及工艺—焊接]