Root Fatigue Fracture Behavior in Fillet Welded Joints of Flange Pipes


Modeling that high stresses exist in the flange pipes of mufflers caused by the vibration of a moving vehicle or an operating machine, fatigue strengths of MIG outer, MIG inner and TIG inner peripheral side welded samples were defined through bending fatigue experiments. Factors affecting fatigue to failure, such as welding bead shapes, notch sizes and metallographic structures were identified through local stress measurements, FEM stress simulations, microscope observations and SEM-EDS composition analyses. Fatigue strengths decreased according to stress concentration factors in some cases but not in samples with different welding, and stress intensity factors were used for analyses.実車走行や実機運転時の振動によりマフラの溶接部に高い応力が存在することを模擬し,外周ミグ,内周ミグおよび内周ティグ溶接試料の強度を曲げ疲労試験で測定した.FEM応力解析,組織観察および成分分析により溶接形状や金属組織の影響を明確にし,応力集中係数および応力拡大係数を用いてルート疲労破壊の要因を解析した.


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  • Accession Number: 01679812
  • Record Type: Publication
  • Source Agency: Japan Science and Technology Agency (JST)
  • Files: TRIS, JSTAGE
  • Created Date: Jul 26 2018 3:01PM