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| X-RAY STRESS MEASUREMENT TECHNIQUE BY SIDE INCLINATION METHOD WITHOUT -η INCLINING INCIDENT ANGLE |
| Res. Gp. of Fatigue; Institute of Metal Research |
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Cite this article:
Res. Gp. of Fatigue; Institute of Metal Research. X-RAY STRESS MEASUREMENT TECHNIQUE BY SIDE INCLINATION METHOD WITHOUT -η INCLINING INCIDENT ANGLE. Acta Metall Sin, 1977, 13(z1): 1-22.
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Abstract The stress calculation formulas for side inclination method without -η in-clining incident angle have been deduced based on its special geometrical rela-tions, the results obtained are as follow:2θ=αsin~2ψ_0+b sin ψ_0+c, σ_x= (K sec~2η_0)α, T_(xy)= (-K csc 2η_0)b After measuring a set of 2θ values corresponding to the incident angles ψ_0by this method, the coefficients α and b in the parabola equations can becalculated by ±ψ_0 linear method or ±ψ_0 Parabola method as presented in thetext, and normal stress σ_x in the measurement direction and shearing stressT_(xy) in the plane to which σ_x applied can thus be obtained. Results of erroranalysis show that the stress calculation formulas and the above ±ψ_0 methodscan satisfy requirements for either engineering or laboratory practice. As σ_2 and T_(xy) can be obtained simultaneously by a single measurement withthis method, so the state of stress at any point on the surface of the object canbe determined by measuring only in two directions at this point. If the 2θ values measured by side inclination method without -η incliningincident angle were treated by the stress calculation formulas of the convention-al method or the side inclination method with -η inclining incident angle, alarge systematic error may often be introduced, its magnitude being decidedmainly by the real values of σ_x, T_(xy) and η_0. The above derived stress calculation formulas are substantiated by experimentalresults.
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| [1] 小木曾克彦,材料,21(1972) ,1058． |
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