The effects of weld mismatch on J-integrals and Q-values for semi-elliptical surface flaws

Boothman, D.P.; Lee, M.M.K.; Luxmoore, A. R.

doi:10.1016/s0013-7944(99)00091-0

Cited by 20 publications

(8 citation statements)

References 15 publications

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“…The ETM overestimates the normalized J , but is a significant improvement on Turner's curve, and gives even better agreement with the 3D results obtained with tension loading 14 . Although both the En J curve and the ETM are based on results of 2D finite element analyses, they are far less conservative than the 2D scheme developed at Swansea.…”

Section: Resultsmentioning

confidence: 71%

J estimation for shallow semi‐elliptical surface cracks in wide plates under pure bending

Boothman

Lee

Luxmoore

et al. 1999

Fatigue Fract Eng Mat Struct

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Three‐dimensional finite element models have been used to predict the J versus applied strain behaviour of shallow semi‐elliptical surface cracks in wide steel plates. These models were loaded in pure bending up to fully plastic conditions that produced maximum strains remote from the crack of 10 times the yield strain. This study examined cracks with a crack depth to plate thickness ratio (a/t) in the range 0.05–0.15, and crack depth to crack half‐length ratio (a/c) from 0.2 to 0.57, in elastic‐hardening materials as well as those with a yield plateau before strain‐hardening. The results were found to differ significantly from those obtained from plane strain analyses, and a J estimation scheme was developed from the three‐dimensional results. Comparisons between the results obtained in this work and the J predictions provided by existing defect assessment methods show that the proposed equations are a significant improvement when large strains are likely.

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Section: Resultsmentioning

confidence: 71%

J estimation for shallow semi‐elliptical surface cracks in wide plates under pure bending

Boothman

Lee

Luxmoore

et al. 1999

Fatigue Fract Eng Mat Struct

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“…When J-integral concept is used in welded joints, the situation is much more complicated due to the existence of mechanical heterogeneity. In the majority of case, the weldment is thought of as made of only one material, all weld metal or base metal, the performance difference between the weld metal and base metal is not taken into account [8][9] . Sham 10 and Lee 11 found that the mismatch in yield strengths alters crack tip stress fields (triaxialities), which in turn can affect the fracture toughness of bi-material joints.…”

Section: Introductionmentioning

confidence: 99%

Effect of the mechanical properties and mode loading on the mechanical behaviour of weldment: a numerical analysis

et al. 2013

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Welding is used to realize permanent assembly in mechanical structures to assure the continuity of the parts to be assembled contrary to the other assembly techniques which have physical or chemical discontinuities. Generally, crack evolution depends on several intrinsic and extrinsic parameters of material. The aim of this work is to analyse the severity of crack defects on the mechanical behaviour of Welded joints. The cracks are considered located in the weld metal. The J-integral method was used to analyse the fracture behaviour of these structures by the two-dimensional finite element method using Cast3M code. The effect of the mechanical properties, the mismatching and the crack size on the J-integral values was highlighted. A good correlation between the FEM simulations and the literature analysis results was observed. We note that the loading mode affects directly the J-integral value and consequently on the mechanical behaviour of the weldment.

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“…Based on a 3D finite element analysis, Song et al [2007] provided mismatch limit loads and approximate J estimates for tensile plates with constant depth, part-through surface cracks in the center of the weld. Boothman et al [1999] used finite element method to calculate the crack driving force J and the constraint parameter Q for semi-elliptical surface cracks in mismatched welds in the middle of wide, rectangular plates. Their results showed that if the yield strength mismatch is within ±30%, the constraint variation at the crack tip is insignificant.…”

Section: Introductionmentioning

confidence: 99%

“…It is well-known since early 1990 that the constraint effect in fracture can have significant impact on fracture analysis and structural integrity assessments. A few constraint theories have been developed for two-parameter fracture methodologies, such as K-T [Nakamura and Parks, 1992], J-Q [O'Dowd andShih, 1991, 1992;Boothman et al, 1999;Shi et al, 2000], and J-A 2 [Yang et al, 1993;Chao et al, 1994Chao et al, , 1997. In general, J-T is used under linear elastic condition.…”

Section: Introductionmentioning

confidence: 99%

Effect of Mechanical Property Mismatch on Failure Assessment Curve for Welded Joint With a Semi-Elliptical Crack

Wang

Zhang

Chao

et al. 2013

Int. J. Appl. Mechanics

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Elastic-plastic finite element analysis was performed to study the welded joints with a semi-elliptical crack. This research includes the effects of crack depth, strength mismatch ratio, and weld width on the crack driving force J-integral and the constraint parameter A 2 at the crack tip. A two-parameter J-A 2 fracture criterion based on the present results of crack tip stress field in the welded joints was established. The corresponding failure assessment diagrams were investigated in detail, from which the reliability and safety margin of the welded structures were discussed.

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The effects of weld mismatch on J-integrals and Q-values for semi-elliptical surface flaws

Cited by 20 publications

References 15 publications

J estimation for shallow semi‐elliptical surface cracks in wide plates under pure bending

J estimation for shallow semi‐elliptical surface cracks in wide plates under pure bending

Effect of the mechanical properties and mode loading on the mechanical behaviour of weldment: a numerical analysis

Effect of Mechanical Property Mismatch on Failure Assessment Curve for Welded Joint With a Semi-Elliptical Crack

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