十字溶接継手止端部応力集中係数のFEM解析によるー考察

摘要

二相ステンレス銅板のケミカルタンカーへの実船適用に向けて，二相ステンレス鋼板の横隔壁の応力が二重底頂板溶接部の疲労強度に及ぼす影響を把握するための基礎検討として，二相ステンレス鋼板のコルゲートバルクへッドと，SUS316Lクラッド銅板の二重底との十字溶接継手部の，一軸および二軸荷重下の静的FEM解析を実施した.十字溶接継手の各溶接止端部の応力集中を評価した結果，以下のような知見が得られた.%For the cruciform welded joints between corrugated bulkhead of Duplex stainless steel plate and inner bottom of stainless(SUS)clad steel plate under biaxial tensile loading condition, numerical analysis of finite element method were performed with changing the loading condition, fillet size and welding condition of penetration. The stress concentration on each weld toe of the cruciform welded joints was evaluated. As results, the geometrical symmetry between upper and lower side welded joint shape on inner bottom plate of cruciform welded joint is important to prevent high stress concentration under biaxial tensile loading condition and partial penetration weld is effective to suooress stress concentration from comparison with fillet weld.