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The transferability of fracture-mechanics parameters to fracture performance evaluation of welds with mismatching
Masao Toyoda, Zdravko Praunseis, 2000, original scientific article

Abstract: The differences in the mechanical properties between different weld-metal regions obviously affect the strain distribution around the crack tip during a fracture test and hence influence the fracture toughness value. The variation in plastic constraint during fracture mechanics testing has an additional effect on the ductile and brittle fracture initiation behaviour of any weld joint. This paper deals with the transferability of fracture toughness results to the fracture performance evaluation of the strenght of mismatch welded joints based on the two-parameter criterion and the local approach. It was found that the numerical simulations based on the transferrable fracture concept are effective in practice.
Keywords: welding, welded joints, strength mismatching, plastic constraint, transferability concept
Published in DKUM: 01.06.2012; Views: 1749; Downloads: 384
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Strength mismatch effect on yield load in X-shaped weldment with centre crack
Dražan Kozak, Nenad Gubeljak, Jožef Predan, Franjo Matejiček, 2004, published scientific conference contribution

Abstract: This paper provides yield load solutions for single edged fracture toughness specimen subjected to bending SE (B) with present X-shaped weld joint. The weld centre crack is located in the overmatch weld part. The corresponding fully plastic yield loads were obtained directly by plain strain FEM analysis for five characteristic a/W ratios: 0,1;0,2;0,3;0,4 and 0,5. Also, the influence of the sistematically varied weld root width 2H on the fracture behaviour has been evaluated. It was found that yield load decreases with the increasing weld root, because the undermatched region ahead the crack tip plays the dominant role.
Keywords: fracture mechanics, X-shaped welded joints, centre crack, strength mismatching, plastic yield load, constraint effects
Published in DKUM: 01.06.2012; Views: 1389; Downloads: 37
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