ビルジホッパナックル部の応力集中係数 Stress Concentration Factors in Bilge Knuckle Part

The stress concentration factor in complex structure is important in the estimation of fatigue life and strength of the structure where nominal stresses are available in design stage. Extensive finite element analysis was applied for complex structures of knuckle parts in tanker, bulk carrier and container ship, and singularity stress fields were found in them when compared to Williams’ solution on fine structure. The analytical fine model is playing complement role in stress concentration factor in complex ship structure. The fine analytical model is based on Williams’ solution on singularity strength of discontinuity. The complex ship structure model was analyzed by finite element method and successfully interpolated by Williams’ solution on fine model, and fine solution of complex system was obtained. Then the stress concentration factors under nominal stress in bilge knuckle part were established.