Influence of Tensile Residual Stresses on the Fatigue Behavior of Welded Joints in Steel

Maddox, S J

doi:10.1520/stp30099s

Cited by 27 publications

(14 citation statements)

References 1 publication

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“…7 Previous work 14,23 has shown that when equation (4) is applied without taking into account the short crack effects, fatigue limits and fatigue strength at low stress levels are overestimated. However, the overestimation was attributed to incomplete stress relief and the influence of short crack behaviour was not taken into account.…”

Section: Implications Of Short Crack Regimementioning

confidence: 99%

Integrated fracture mechanics approach to analyse fatigue behaviour of welded joints

Chapetti¹,

Belmonte²,

Tagawa³

et al. 2004

Science and Technology of Welding and Joining

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Current fracture mechanics methods for fatigue assessment, including those that consider thresholds for crack propagation, are based on long crack behaviour. The present work is concerned with an attempt to predict the fatigue strength of welded joints using a fracture mechanics approach that takes into account the fatigue behaviour of short cracks. The methodology estimates the fatigue crack propagation rate as a function of the difference between the applied driving force and the material threshold for crack propagation, which is a function of crack length. The fatigue strength of butt welded specimens stressed transversely was analysed. Experimental results from the literature were used for comparison. Estimations are obtained by using only the fatigue limit and the fatigue propagation threshold for long cracks, and the applied stress distribution along the crack path obtained from simple finite element models. The influence of plate thickness, initial crack length, and reinforcement angle on fatigue strength of butt welded joints was analysed. Results show good agreement with experimental trends. STWJ/425a crack length a f final crack length a i initial crack length a np length of non-propagating crack da/dN crack propagation rate A, C, m environmentally sensitive material constants d microstructural dimension (e.g. grain size) h weld reinforcement height k material constant that takes into account development of DK C k tx stress concentration at given distance x from weld toe surface DK applied stress intensity factor range DK C extrinsic component of DK th DK CR extrinsic component of DK thR DK dR microstructural threshold DK th fatigue crack propagation threshold DK thR fatigue crack propagation threshold for long cracks M k correction factor n constant N total fatigue life R stress ratio (minimum stress/maximum stress) t plate thickness t 0 reference plate thickness w weld reinforcement width x distance from weld toe surface along crack path Y crack shape parameter Y u crack shape parameter for welded joint a weld reinforcement angle r weld toe radius Ds nominal stress adjacent to welded joint Ds e fatigue limit (endurance 10 7 cycles) Ds eR smooth fatigue limit Ds n nominal applied stress range Ds t fatigue strength for thickness t Ds t0 fatigue strength for reference thickness t 0 Ds th threshold stress range for crack propagation s u ultimate tensile strength s ys yield strength Ds(x) local applied stress range s yy (x) non-uniform stress field calculated along notch bisector, without considering presence of crack INTRODUCTIONMechanical fatigue of metallic materials

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Section: Implications Of Short Crack Regimementioning

confidence: 99%

Integrated fracture mechanics approach to analyse fatigue behaviour of welded joints

Chapetti¹,

Belmonte²,

Tagawa³

et al. 2004

Science and Technology of Welding and Joining

View full text Add to dashboard Cite

show abstract

“…The first clearcut result is that at higher loads, the fatigue life is not influenced by the longitudinal and transversal residual stresses, both compressive and tensile. This is because the cyclic external load, overimposed to the pre-existing stress, is sufficiently high to yield the material and to partially relax the residual stress, as confirmed by several authors [35][36][37][38][39][40].…”

Section: Resultsmentioning

confidence: 81%

Some considerations about fatigue failure in milled butt-welded joints affected by residual stress

2010

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Many factors are involved in determining the fatigue strength of welded joints. It is, however, very difficult to consider their relative importance. The aim of this paper is to isolate the effect of residual stress from other factors, establishing a relation between the amount of residual stress and fatigue life. A geometrical notch due to the weld bead is removed by milling the upper surface of the welded plates. Moreover, specimens are subjected to four-point bend loading. Before conducting the fatigue test, the magnitude of residual stress for each specimen is experimentally evaluated, and then linked to the number of cycles to failure. This relation is analyzed for three different plate thicknesses and for different stress amplitude levels in the high cycle regime. The results clearly show the significant influence of residual stress on fatigue behaviours when the load level is near the fatigue limit.

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“…The heat source, which was originally described for plate welding [22,23], is modified in order to make it appropriate for circumferential girth welding. Equations (2) and (3) represent the cylindrical form of this equation [24].…”

Section: Heat Source Modellingmentioning

confidence: 99%

“…These distortions can lead to poor sealing performance of the joint. In addition, it is important for the function of a structure that the welding residual stress field should be known quantitatively, as it may influence the mechanical behaviour of structures including fracture, stress corrosion cracking, fatigue, and buckling [2]. Tensile residual stresses are detrimental to the initiation and growth of fatigue cracks.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Residual Stresses and Distortions due to Multi-Pass Welding in a Pipe-Flange Joint

Abid

Qarni²

2010

Proceedings of the Institution of Mechanical Engineers, Part E:

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This paper presents a numerical simulation for examining temperature fields, residual stresses, and distortions in multi-pass welding of a pipe-flange joint. A sequentially coupled transient non-linear thermo-mechanical three-dimensional finite-element model is developed to simulate four-pass tungsten inert gas welding process. An ANSI class 300# flange is welded with a 6 mm thick, 200 mm long, and 100 mm nominal diameter pipe, using a single V-groove butt joint with a 1.2 mm root opening. Goldak's double ellipsoidal model is used for the weld heat source, and inactive element addition technique is used for the addition of weld filler elements. Axial and hoop residual stresses and out-of-plane distortions along the flange face are plotted. In addition, welding start and end effects are discussed.

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Influence of Tensile Residual Stresses on the Fatigue Behavior of Welded Joints in Steel

Cited by 27 publications

References 1 publication

Integrated fracture mechanics approach to analyse fatigue behaviour of welded joints

Integrated fracture mechanics approach to analyse fatigue behaviour of welded joints

Some considerations about fatigue failure in milled butt-welded joints affected by residual stress

Numerical Investigation of Residual Stresses and Distortions due to Multi-Pass Welding in a Pipe-Flange Joint

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