赤外線応力画像解析法による全応力分離解析システムの確立

概要

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A method of resolution of all stress components from the first invariant of stress J_1 measured using a thermoelastic stress analyzer is shown. Not only surface stress but also internal stress can be determined by this method which is based on the following procedures. ( 1 ) Select an arbitrary domain Γ where the stresses must be determined from the structure. ( 2 ) Measure J_1 inside Γ. ( 3 ) Determine the optimum boundary traction along Γ by the least squares method so that the difference between the measured J_1 and calculated J_1 is minimum. Either FEM or BEM may be used for calculation. Examples of stress resolution for a two-dimensional stress concentration problem and a three -dimensional stress concentration problem are shown and the accuracy of stress resolution is discussed.
1995-11-25