参考复合钢板性能试验方法, 利用压力试验机和自主设计的试验夹具配合测试激光熔覆层结合强度。借助有限元分析方法探究涂层结合面尺寸变化对结合强度的影响, 以获得最优的强度测试试样尺寸, 并通过剪切实验对试样的最优尺寸进行了验证。结果表明, 采用所设计的剪切试验装置配合压力试验机能够开展熔覆层结合强度的测试试验。涂层与剪切刀结合处受应力最大, 是最先受到剪切破坏的位置, 随着涂层结合面长度的增加其平均应力先增大后减小, 被测试样结合面尺寸大于或小于3 mm时均会产生较大的应力集中, 使得结合面提前断裂。当熔覆层厚度为2 mm、结合面长度为3 mm时, 为最优强度测试试样尺寸。

Referring to performance test method of clad steel plate, we tested bonding strength of the laser cladding layer using the pressure testing machine and the test fixture designed independently. In order to obtain the optimum strength test sample size, the influence of the size change of coating bonding surface on bonding strength was explored by finite element analysis, and the optimum size of the sample was verified by shear experiment. The results showed that the bonding strength test of the cladding layer can be carried out by using the designed shear test device and the pressure testing machine. The maximum stress occurs at the junction of the cladding layer and the shear blade, which is the first place to be destroyed by shear. The average stress increases first and then decreases with the increase of the length of bonding surface. If the test sample size is smaller or larger than 3 mm, larger stress concentration will be caused, which makes the bonding surface fracture in advance. When the thickness of the cladding layer is 2 mm and the length of the bonding surface is 3 mm, the optimum strength test sample size is obtained.