用改进的盲孔法测试复合钢板复板的残余应力

Measurement of residual stress in clad layer of steel clad plate with improved blind-hole drilling method.

为了研究复合钢板复板中残余应力的大小和分布状况 ,采用改进的盲孔法 ,即在测点打孔后多次扩孔 ,利用相似标定实验所得多组应变释放系数计算残余应力 ,可得不同深度残余应力的估算值。实测结果与定性分析结果吻合。测试结果还表明 ,复合钢板复层内存在残余应力 ,且以拉 拉和拉 压应力状态为主 ,应力沿厚度方向非均匀分布 ,随深度增加应力增大 ,最大应力位于结合面附近 ,应力值超过 10 0MPa。

Improvement to the conventional blind-hole drilling method has been done to measure residual stress in clad layer of steel clad plate welded with explosive. The improvement was the following: repeating(2～3) times reaming and measuring after the first drilling at the given position, then calculating the residual stress with the measuring results and strain-relaxation coefficients of corresponding calibration test. As results of this process the residual stress distribution along the depth was obtained. From the testing result with two-phase stainless steel 00Cr18Ni5Mo3Si2 as clad layer of a steel clad plate, it has been shown satisfactory coincidence with the quatitative analysis and measuring results of Ni-Cr steel clad by other researcher.