熱弾性境界要素法による溶接残留応力の簡易同定法 : 理論の構築と数値シミュレーションによる検討

概要

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A simplified identification method using a thermo-elastic boundary element method is proposed to estimate residual stress distribution due to butt-welds of a plate. The proposed method can identify residual stress distributions by a few measurement data, which are measured by a nondestructive (or destructive) method. It is generally known that residual stresses produced along welding lines are difficult to measure by X-ray diffraction method. However, identification of the location of the largest residual stress value is very important. The proposed methods can identify the inherent strain distribution from the measurement data near the welding lines by X-ray diffraction method, and the distribution of the residual stress and its largest value along the welding line can be calculated from the inherent strain in butt-welding plate. The validity of the proposed method is demonstrated in this paper by numerical simulations. The applicability and the effectiveness of the method are confirmed by numerical examples with and without random measurement errors.
2009-05-25