Testing and fracture mechanics analysis of strength effects on the fatigue behavior of HFMI-treated welds

Ranjan, Rakesh; Ghahremani, Kasra; Walbridge, Scott; Ince, Ayhan

doi:10.1007/s40194-016-0354-4

Cited by 10 publications

(31 citation statements)

References 19 publications

(39 reference statements)

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“…A schematic representation of longitudinal stiffener joint specimens is shown in in Figure 2. It has been reported by several studies 52,53,56 that the initial defect(s) in the welded joint locations were observed as semielliptical crack shape(s) as schematically depicted in Figures 1 and 2.…”

Section: Experimental Data Of Welded Jointsmentioning

confidence: 80%

“…Experimental residual stress and fatigue life data for the 5083-H321 aluminum, CSA 350W, ASTM A514, S355, and S960 steel alloys have been taken from corresponding literature. [52][53][54][55] Figures 3-7 show both residual stress and fatigue data for these materials. The residual stress and fatigue life data are plotted as red triangle markers for AW condition and blue rectangular markers for the HFMI treatment conditions.…”

Section: Experimental Residual Stress and Fatigue Life Data Of Welded Specimensmentioning

confidence: 99%

“…In general, fatigue life improvement is more pronounced for materials with higher yield strength. 53…”

Section: Experimental Residual Stress and Fatigue Life Data Of Welded...mentioning

confidence: 99%

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Computational crack propagation modeling of welded structures under as‐welded and high frequency mechanical impact (HFMI) treatment conditions

Ince

2021

Fatigue Fract Eng Mat Struct

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The fatigue damage assessment of welded structures is of critical importance in the design of many engineering structures. The thermomechanical nature of the welding process leads to undesired tensile residual stresses, which results in fatigue performance degradation of welded structures. High-frequency mechanical impact (HFMI) technique offers significant potentials to induce compressive residual stresses into the welded joints, thus improving fatigue life of welded parts. In this paper, a new crack propagation modeling approach considering effects of residual stress fields and the crack closure based on a modification of the Forman model is proposed to assess fatigue crack propagation performance of welded joints under as-welded and HFMI treatment conditions. Experimental residual stress and fatigue data sets of 5083-H321 aluminum, CSA 350W, ASTM A514, S355, and S960 steel welded joints are used to validate the proposed approach. Both predicted and experimental results show that the fatigue life improvement by the HFMI treatment depends on the applied stress level and material type. The fatigue life improvement is greater at the lower stress levels with a factor of more than 10-30 times, and the fatigue life increase becomes less at the higher stress levels with a factor of two to three times depending on the material type of welded joints. The fatigue life improvement by the HFMI is more significant with a higher material yield strength. Compared results showed that the proposed modeling approach provides efficient and accurate life predictions of the welded joints of five different materials under both as-weld and HFMI conditions. The proposed modeling framework can be used as an effective analysis technique for fatigue crack propagation life of welded structures under pre-and post-weld treatment conditions to account for residual stress fields.

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Section: Experimental Data Of Welded Jointsmentioning

confidence: 80%

Section: Experimental Residual Stress and Fatigue Life Data Of Welded Specimensmentioning

confidence: 99%

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Computational crack propagation modeling of welded structures under as‐welded and high frequency mechanical impact (HFMI) treatment conditions

Ince

2021

Fatigue Fract Eng Mat Struct

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“…The FE residual stress results in UIT-treated weld joint demonstrated that the UIT introduced compressive residual stress layer with various depth, which brought beneficial effect on fatigue strength of the material [7,[33][34][35][36][37][38].…”

Section: Residual Stress Analysis On Welded Joints By Means Of Numerimentioning

confidence: 98%

“…A number of numerical techniques have been developed to model the influence of tensile residual stresses on fatigue strength of welded joints [3][4][5][6]. Over the past several decades, numerous post-weld treatment techniques, including grinding, TIG dressing, hammer peening and shot peening, have been developed to address this vexing issue and improve fatigue performance of weld joints [7]. These treatments are generally classified into two different categories: geometry improvement and residual stress modification techniques.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Residual Stresses in Welding and Ultrasonic Impact Treatment Process

Tang¹,

Ince²,

Jiao³

2018

Residual Stress Analysis on Welded Joints by Means of Numerical Simulation and Experiments

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Welding technology is considered as a reliable and efficient joining method, which has been widely used in almost all the industry departments. Detrimental factors induced by welding such as micro-cracks/flaws, tensile residual stresses, high stress concentration may degrade the mechanical and fatigue properties of weld joints. Ultrasonic impact treatment (UIT) is considered one of the most efficient post-weld treatment which could improve the fatigue performance of weld joints. In this study, the effect of the UIT on residual stress distribution of 304L weld joints was particularly investigated. FE analysis simulation and the XRD experiment were performed to predict and measure residual stresses of both as-welded and the UIT-treated joints. Compared results show that simulated stresses are in good agreement with the experimental results along various paths, confirming the validity of welding model. The UIT introduces a compressive residual stress layer with depth between 2 and 3 mm near the impacting surface of weld joint.

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2D fracture mechanics analysis of HFMI treatment effects on the fatigue behaviour of structural steel welds

Ranjan

Walbridge

2021

Weld World

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Testing and fracture mechanics analysis of strength effects on the fatigue behavior of HFMI-treated welds

Cited by 10 publications

References 19 publications

Computational crack propagation modeling of welded structures under as‐welded and high frequency mechanical impact (HFMI) treatment conditions

Computational crack propagation modeling of welded structures under as‐welded and high frequency mechanical impact (HFMI) treatment conditions

Numerical Simulation of Residual Stresses in Welding and Ultrasonic Impact Treatment Process

2D fracture mechanics analysis of HFMI treatment effects on the fatigue behaviour of structural steel welds

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