Spherical indentation strain-gauge method is one of methods to m easure the surfaced residual stress with m easurem ent depth of 0. 1mm. The im pact of surface roughness on residual stress results was discussed. The r...Spherical indentation strain-gauge method is one of methods to m easure the surfaced residual stress with m easurem ent depth of 0. 1mm. The im pact of surface roughness on residual stress results was discussed. The results have shown th at, in tests ① and ② , Rx is droppedby 14 MPa approximately with the surface roughness being decreased from 0. 75 μm to 0. 55 μm . While in 44 MPa with the surface roughness being decreased from 0 . 75 μm to 0. 55 μm . Compared to tests ① and ② , the effect of the surface roughnesson residual stress results is more significant in tests ③ and ④ , and the reduction effect of surface roughness on residual stress measurement is enhanced. In engineering application, most components are already in different stress states. Therefore, the influence on residual stress m easurem ent can not be ignored. Residual stress of a 2219-T87 A1 alloy plate was m easured. With the confidence level of 0. 95 , the confidence interval is [-122.515,-113.8849] MPa.展开更多
文摘Spherical indentation strain-gauge method is one of methods to m easure the surfaced residual stress with m easurem ent depth of 0. 1mm. The im pact of surface roughness on residual stress results was discussed. The results have shown th at, in tests ① and ② , Rx is droppedby 14 MPa approximately with the surface roughness being decreased from 0. 75 μm to 0. 55 μm . While in 44 MPa with the surface roughness being decreased from 0 . 75 μm to 0. 55 μm . Compared to tests ① and ② , the effect of the surface roughnesson residual stress results is more significant in tests ③ and ④ , and the reduction effect of surface roughness on residual stress measurement is enhanced. In engineering application, most components are already in different stress states. Therefore, the influence on residual stress m easurem ent can not be ignored. Residual stress of a 2219-T87 A1 alloy plate was m easured. With the confidence level of 0. 95 , the confidence interval is [-122.515,-113.8849] MPa.
