A boundary element analysis of misaligned load-carrying cruciform welded joints

Lie, S.T.; Lan, Shengrui

doi:10.1016/s0142-1123(97)00133-3

Cited by 14 publications

(5 citation statements)

References 1 publication

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“…Thus, thermal oxidation leaded a reduction in the fatigue strength of around 34 %. Similarly 24% decrease in fatigue strength of a Ti6Al4V alloy was reported by Li et al [12].…”

Section: Resultssupporting

confidence: 75%

High Cycle Fatigue Behavior of Thermally Oxidized Ti6Al4V Alloy

Cingi

Meydanoğlu

Güleryüz

et al. 2007

MSF

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In this study, the effect of thermal oxidation on the high cycle rotating bending fatigue behavior of Ti6Al4V alloy was investigated. Oxidation, which was performed at 600°C for 60 h in air, considerably improved the surface hardness and particularly the yield strength of the alloy without scarifying the tensile ductility. Unfortunately, the rotating bending fatigue strength at 5x106 cycles decreased from about 610 MPa to about 400 MPa upon oxidation. Thus, thermal oxidation leaded a reduction in the fatigue strength of around 34%, while improving the surface hardness (HV0.1) and yield strength 85 % and 36 %, respectively.

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“…Thus, thermal oxidation leaded a reduction in the fatigue strength of around 34 %. Similarly 24% decrease in fatigue strength of a Ti6Al4V alloy was reported by Li et al [12].…”

Section: Resultssupporting

confidence: 75%

High Cycle Fatigue Behavior of Thermally Oxidized Ti6Al4V Alloy

Cingi

Meydanoğlu

Güleryüz

et al. 2007

MSF

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“…14). Below this propagation rate the material exhibits a deviation from the Paris relationship (equation ( 3)) used by various workers [15][16][17] to describe crack growth in welds. Thus a simple linear relationship between stress intensity and growth rates on logarithmic scales is only accurate when the joints are subjected to high stress ratio or high nominal loads producing crack growth a initial cyclic damage in form of cyclic hardening or softening, e.g.…”

Section: Fatigue Of Welded Jointsmentioning

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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“…However, the vast majority of previous experimental studies [15] have focused on single-or double-sided fillet welds where the adjoined plate member is subjected to axial membrane loading having only secondary bending due to the angular distortion or the axial offset of adjoined plate members, as in [16] . Supposedly, there are two main reasons for this: Firstly, the root fatigue capacity of double-sided fillet welded joints subjected to bending is much higher than joint subjected under axial tension and consequently, careful consideration of potential root fatigue is particularly required in the case of axial loading [17][18][19]. Secondly, due to complexity of bending test procedure, axial tension tests have been preferred [20].…”

Section: Introductionmentioning

confidence: 99%