Models for the estimation of weldment fatigue crack initiation life

Hou, Chien-Yuan; Charng, Jenq Jy

doi:10.1016/s0142-1123(97)00072-8

Cited by 20 publications

(14 citation statements)

References 12 publications

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“…This results coincide well with the results for the fatigue crack initiation life. Once a crack is nucleated from the notch, it grows in the manner of a small or short crack, which is known to exhibit anomalous crack growth behavior [13][14]. As shown in Fig.…”

Section: Test Results and Discussionmentioning

confidence: 99%

Variability of Fatigue Crack Initiation Life in Flux Cored Arc Welded API 2W Gr.50 Steel Joints

Sohn¹

2012

International Journal of Ocean System Engineering

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Flux Cored Arc Welding (FCAW) is a common practice to join thick plates such as the structural members of large scale offshore structures and very large container ships. The objective of this study was to investigate the mechanical properties and variability of the fatigue crack initiation life in the flux cored arc welded API 2W Gr.50 steel joints typically applied to offshore structures with a focus on the effect of the materials in fatigue crack growth life from the notch root of a compact tension specimen. Offshore structural steel (API 2W Gr.50) plates (60-mm thick) were used to fabricate multi-path flux core arc welded butt welded joints to clearly consider fatigue fractures at the weld zone from the notch. Fatigue tests were performed under a constant amplitude cyclic loading of R = 0.4. The mean fatigue crack initiation life of the HAZ specimen was the highest among the base metal (BM), weld metal (WM), and heat affected zone (HAZ). In addition, the coefficient of variation was the highest in the WMl specimen. The variability of the short fatigue crack growth rates from the notch tips in the WM and HAZ specimens was higher than in BM.

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Section: Test Results and Discussionmentioning

confidence: 99%

Variability of Fatigue Crack Initiation Life in Flux Cored Arc Welded API 2W Gr.50 Steel Joints

Sohn¹

2012

International Journal of Ocean System Engineering

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“…In the literature, the transition length a t varies between 0.1 mm ≤ a t ≤ 1.0 mm ( Table 1). The crack initiation is derived by various approaches, using notch factors (K f , [22,23]), the strain life approach [10,11] K f 0.1 mm Dimitrakis [13] K t 0.1 mm Chattopadhyay [14] σ − ε 0.5 mm Hou [15] / [16] K t 0.5 mm/0.25 mm Lawrence [17] K f acc. Peterson 0.25 mm Lihavainen [18] σ − ε 1.0 mm Remes [19] K f / σ − ε f ( K th ) Schaumann [20] σ − ε 0.1 mm Verreman [21] N-SIF 0.5 mm (σ − ε, [17,24]), or the notch stress intensity factor (N-SIF, [25][26][27]).…”

Section: Two-phase Modelsmentioning

confidence: 99%

Enhancement of the fatigue strength assessment of welded components by consideration of mean and residual stresses in the crack initiation and propagation phases

Baumgartner

2016

Weld World

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The starting point of the investigations presented in this paper is the simplified consideration of mean and residual stresses as well as the complete disregard of the complex failure mechanisms in the common fatigue standards and guidelines. An improved fatigue life assessment for welded components, which includes the crack initiation and propagation phase is the scope of this paper. The crack initiation phase is considered using the strain-life approach. The crack propagation life, starting from a technical crack of a depth of a = 0.5 mm, is derived by the application of linear-elastic fracture mechanics. In this two-phase approach, the mean and residual stresses are considered by using damage parameters for the initiation phase and effective stress intensity factors for the propagation phase. With this approach, a better understanding can be obtained of the influence of mean- and residual stresses and their influence on the course (slope k and knee point Nk) of the S-N curve. With this information to hand, a more reliable fatigue assessment can be achieved than is possible with the common standards and guidelines. With the proposed two-phase approach, higher permissible stresses can be allowed in the design phase, leading to resource-efficient, lightweight constructions

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“…Newman et al, [14] put it forward that It has introduced the plastic loop area and correction for the range of constraint coefficient; Hou and Charng [15] found that FEM analysis based on the short crack propagation generates more consistent results than those conducted by local analysis method. These two aspects is of great significance to the serious accidents of the machinery for steel structure and expanding the utility of aging structure.…”

Section: Introductionmentioning

confidence: 99%

Crack Analysis of Multi-plate Intersection WeldedStructurein Port MachineryUsing Finite Element Stress Calculation andAcoustic Emission Testing

Lu¹,

Zhang²,

Ye³

et al. 2014

IJHIT

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Models for the estimation of weldment fatigue crack initiation life

Cited by 20 publications

References 12 publications

Variability of Fatigue Crack Initiation Life in Flux Cored Arc Welded API 2W Gr.50 Steel Joints

Variability of Fatigue Crack Initiation Life in Flux Cored Arc Welded API 2W Gr.50 Steel Joints

Enhancement of the fatigue strength assessment of welded components by consideration of mean and residual stresses in the crack initiation and propagation phases

Crack Analysis of Multi-plate Intersection WeldedStructurein Port MachineryUsing Finite Element Stress Calculation andAcoustic Emission Testing

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