残留応力の測定について (第3報)

熱処理した平板の残留応力の測定法について

抄録

In this report, the method of measurement of the residual stress quenched or tempered plate, acting symetrically with respect to the neutral plan, is explained, which consists of the removal of the surface layer of plate from both sides by corrosion and the measurement of the resultant change of the specific volume.
Let ₀σ_x and ₀σ_y be the residual principal stress components acting on the cross section normal to the axes x, y in the plate, and ε_v the resultant change of the volume strain in the remaining portion after the removal of outer layer up to thickness 2z.
₀σ_x=₀σ_y=-E/2(1-2ν)(ε_v+zdε_v/dz)
ε_v=2(1-2ν)/3(1-ν)v-v₀/v₀
E: Young's modulus, ν: Poisson's ratio, v₀, v is the specific volume before and after removal of layer.
The principle and the actual data of measurement are explained.