P-SC327-5 シンクロトロン放射光によるセラミックスのき裂近傍の応力分布評価

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In order to measure loading and residual stresses near the crack tip in Al_2O_3 ceramics, X-ray elastic constants were first determined experimentally. Mechanical elastic constants of the used material were E=372 GPa and v=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 v_x=0.20. Next, the local stress in the irradiated area with 100×100μm was measured in comparison with that with 100×500μm. As a result, loading and residual stress in a local area with 100×100μm can be measured by (sin)^2Ψ method using a micro X-ray beam of Spring 8. Finally, the local stress distribution, σ_v(x), near the V-notch tip under a four-point bending load was measured by scanning the X-ray beam along the x-axis. In the close vicinity of the notch tip, local stress distribution having a steep stress gradient was found to be difficult to measure, because complicated residual stresses due to V-notch machining were generated near the notch tip. In this study the local stresses were modified by subtracting residual stress from measured stress. From x>50μm, the modified stress distribution corresponded to the results of a three-dimensional finite element analysis.
一般社団法人日本機械学会の論文
2002-03-07

P-SC327-5 シンクロトロン放射光によるセラミックスのき裂近傍の応力分布評価

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