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An application of the X-ray stress measurement to curved surface residual stress of cylindrical surface

机译:X射线应力测量在圆柱曲面弯曲残余应力中的应用

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摘要

A large area of X-ray irradiation causes some errors in measuring the residual stress of the curved surface by using (sinψ){sup}2, method. To evaluate the true stress of the cylindrical surface, the relation between the errors of measured residual stress and sizes of X-ray irradiated areas was investigated experimentally and analytically. In the experiment masking tapes on the cylinder of tool steel were used to vary the size of the irradiated area. Bragg's X-ray diffractions in the irradiated regions of the cylinder were simulated in the analysis and the residual stresses were calculated according to (sinψ){sup}2 method. These results show that (1) the magnitude of measured circumferential residual stress σ is smaller than true stress 250L襸sub}ω, (2)the ratio between two stresses σ/σ{sub}ω and the difference in those stresses ξ are represented by the following approximate relations σ/σ{sub}ω= Mcos{1.92(ζ/ρ)}, ξ= σ[M{sup}(-1)sec{1.92(ζ/p)}-1], where M≈1.81 (t/ρ) + 1, the X-ray irradiated area 2ζ the diameter of the cylinder 2ρ, and the thickness of the masking tape t, and (3) the magnitude of the measured axial residual stress is hardly affected by the X-ray irradiated area or by the diameter of the cylinder.
机译:大面积的X射线辐射在使用(sinψ){sup} 2,方法测量曲面的残余应力时会引起一些误差。为了评估圆柱表面的真实应力,通过实验和分析研究了测得的残余应力误差与X射线辐照区域尺寸之间的关系。在实验中,工具钢圆柱体上的遮蔽胶带用于改变照射区域的大小。在分析中模拟了布拉格在圆柱体照射区域的X射线衍射,并根据(sinψ){sup} 2方法计算了残余应力。这些结果表明:(1)测得的周向残余应力σ的大小小于真实应力250Lωsub}ω,(2)两个应力σ/σ{sub}ω的比率以及这些应力ξ的差为由以下近似关系表示:σ/σ{sub}ω= Mcos {1.92(ζ/ρ)},ξ=σ[M {sup}(-1)sec {1.92(ζ/ p)}-1],其中M≈1.81(t /ρ)+ 1,X射线照射区域2ζ的直径为圆柱体2ρ,并且胶带的厚度为t,并且(3)测量的轴向残余应力的大小几乎不受X射线照射的区域或圆柱体的直径。

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