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Abstract: Significant
error of the measuring result may arise when measuring high residual
stress by means of the centre hole method. And because the material
around the hole is close to the yield limit, plastic deformation induced
plastic strain. The strain release coefficients related with the angle
between the principal direction of stress and the direction of the
strain gauge, the biaxiality ratio, and the equivalent stress are
studied . Then by FEM (Finite elcment method) the strain release
coefficients including plasticity effects are recalculated, which we
used to measure and calculate the residual stresses induced by welding
in welded Aluminum plate.
Key
words: Centre
hole method Residual stress Welding FEM (Finite element method)
CLC No: TG4
北京市自然科学基金资助项目(3042010). Received 20040314, received in revised form
20041027
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