大形構造物用X線応力測定装置

概要

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The strength of large structures such as vessels, slips or bridges depends mostly not only on the residual stress caused by welding but also on constrained stress, and therefore a non destructive stress measurement on a real object is demanded. Based on he experience that one of the authors previously made X-ray stress measurement of ship construction, authors newly developed a compact type of X-ray diffraction stress analyzer which adopts a modified side inclination method and enables the stress measurement at the corner of structures. This analyzer has also such features as an incident dent X-ray oscillation mechanism for the stress measurement of coarse grained materials, a direct charge system for making counting circuits small and 5×5 mm^2 Iarge focal spot X-ray tube which is useful in side inclination method. The relation between the measured stress σ_x' and the true stress σ_x is theoretically calculated as follow. σ_x'= 0.96σ_x+ 0.006σ_y-0.08Sin 2φ(σ_1-σ_2) The error of σ_x' is negligibly small, and is found to be comparable to that of the data by using a conventional type of apparatus, based on the experimental results on S15C and S40C heat-treated specimens under uniaxial stress. Goniometer setting error under ±2 mm also does not increase the error in X-ray stress measurement.
社団法人日本材料学会の論文
1977-01-15