シンクロトロン放射光によるアルミナの切欠き先端近傍の局所応力その場測定

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In order to measure loading and residual stresses near the notch tip in Al_2O_3 ceramics using a micro X-ray beam of SPring 8 (Super Photon ring-8GeV), X-ray elastic constants were first determined experimentally. Mechanical elastic constants of the used material were E=372 GPa and ν=0.23. The diffraction from Al_2O_3 2.0.14 plane by 8keV radiation was used for X-ray stress measurement. The 2θ-sin^2ψ diagrams under several applied stresses were measured. From the relationship between both slope, M, and intercept 2θ_<ψ=0> of 2θ-sin^2ψ diagram and applied stress, X-ray elastic constants were determined to be E_x=416 GPa and νx=0.20. Next, the local stress measurement in the irradiated area with 100×100μm^2 was examined in comparison to that with 100×500μm^2. Loading stress in a local area with 100×100μm^2 can be measured by the sin^2ψ method. Finally, the local loading stresses, σ_y(x), near the V-notch tip under a four-point bending load were measured across the minimum ligament of SEVNB (Single-Edge-V-notched Beam) specimen by scanning the micro X-ray beam along the x-axis. The stress concentration near the notch root was first difficult to be measured directly because of the grinding residual stress by V-notch machining. After annealing, the stress concentration was detected by changing the irradiated area of X-ray from 100×100 to 50×50μm^2. The degradation of the measured stresses in the notch tip was caused by the X-ray irradiation to the notch, and almost agreed with the results of a finite element analysis. The local stress and residual stresses were found to be measured by the sin^2ψ method using synchrotron micro X-ray beam with a spatial resolution of about 50μm.
社団法人日本材料学会の論文
2003-10-15

シンクロトロン放射光によるアルミナの切欠き先端近傍の局所応力その場測定

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