A Fracture-Mechanics and System-Stiffness Approach to Fatigue Performance of Spot-Welded Sheet Steels

Davidson, J. A.; Imhof, E. J.

doi:10.4271/830034

Cited by 50 publications

(19 citation statements)

References 6 publications

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“…Fatigue crack 1 can be considered as a kinked crack emanating from the original crack tip. A similar failure mechanism was observed in the resistance spot weld lap-shear specimens in mild steel, high strength steel and dual phase steel (Lin et al, 2006b;Pollard, 1982;Davison and Imhof, 1983). Fig.…”

Section: Fig 11 -(A) a Micrograph Of The Cross-section Of A Frictionsupporting

confidence: 72%

Fatigue lives of friction stir spot welds in aluminum 6061-T6 sheets

Wang

Chen

2009

Journal of Materials Processing Technology

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Section: Fig 11 -(A) a Micrograph Of The Cross-section Of A Frictionsupporting

confidence: 72%

Fatigue lives of friction stir spot welds in aluminum 6061-T6 sheets

Wang

Chen

2009

Journal of Materials Processing Technology

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“…Experimental results for steel spot-welds demonstrate that the base metal strength has an insignificant effect on the fatigue life [26,40]. These observations support the idea that spot-welds are crack-like flaws, and fracture mechanics is the appropriate approach for fatigue modeling.…”

Section: Fracture Mechanics Approach -Swellam's Modelmentioning

confidence: 57%

“…For the case of smooth specimens and blunt notched components, where the crack initiation process dominates, fatigue life is closely related to the material strength [40]. However, fatigue life in sharp notched and cracked components is controlled by crack propagation and is insensitive to material strength [41].…”

Section: Fracture Mechanics Approach -Swellam's Modelmentioning

confidence: 99%

Fatigue characterization and modeling of AZ31B magnesium alloy spot-welds

Behravesh

Jahed

Lambert

2014

International Journal of Fatigue

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Cyclic behavior of AZ31B spot-welds was studied using different specimen configurations, and compared with steel and aluminum spot-welds. Fatigue strength of magnesium spot-welds was similar to aluminum and less than steel. Three failure modes were observed in tensile-shear specimens and one mode of failure in cross-tension specimens. Fatigue crack initiation life was 50% and 30% of the total life for tensile-shear and cross-tension specimens, respectively. A number of available fatigue models were assessed by predicting fatigue life of magnesium spot-welds. Although these models do not account for the asymmetric cyclic hardening behavior, some of them performed successfully for magnesium spotwelds.

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“…On the other hand, geometric parameters such as sheet thickness [45][46], coupon width [45], and spot weld diameter [44][45][47][48] have been identified as the most significant factors on fatigue strength of spot welds. Davidson and Imhof [30] have reviewed the effects of these parameters on fatigue strength in low and high cycle regimes. Nugget size effect on fatigue resistance of steel and aluminum spot welds as reported by Pollard [47] and Gean, et al [48] is noticeable for low cycle but not in the high cycle regime.…”

Section: Introductionmentioning

confidence: 99%

“…The main approaches in these models include: structural stress [20][21][22][23], local stress/strain [21,[24][25][26][27], stress intensity factor [24,[28][29][30], and crack growth [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Characterization of magnesium spot welds under tensile and cyclic loadings

2011

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Resistance spot welds of a magnesium alloy were characterized in terms of microstructure, hardness and monotonic and cyclic properties. Microstructural features in base metal and different zones in the weld region were discussed and the mechanical behavior of spot welds in tensile-shear configuration was studied. Effects of welding parameters were investigated on the micro-and macroscale characteristics of magnesium spot welds. To this end, five sets of spot weld specimens were prepared, utilizing different welding parameters. The effect of cyclic loading was studied on microstructure and hardness of the base metal and the weld region, and it was shown that microstructural features do not change remarkably under cyclic loading. Fatigue crack initiation and propagation behavior was discussed for different specimen sets under both low and high cyclic loads. Fatigue cracks under high cyclic loading initiated close to the nugget edge, and decreasing the cyclic load nucleated the cracks farther from the nugget.The final publication is available at Elsevier via http://dx.doi.org/10.1016/j.matdes.2011.06.001 © 2011 ABSTRACTResistance spot welds of a magnesium alloy were characterized in terms of microstructure, hardness and monotonic and cyclic properties. Microstructural features in base metal and different zones in the weld region were discussed and the mechanical behavior of spot welds in tensile-shear configuration was studied. Effects of welding parameters were investigated on the micro-and macro-scale characteristics of magnesium spot welds. To this end, five sets of spot weld specimens were prepared, utilizing different welding parameters. The effect of cyclic loading was studied on microstructure and hardness of the base metal and the weld region, and it was shown that microstructural features do not change remarkably under cyclic loading. Fatigue crack initiation and propagation behavior was discussed for different specimen sets under both low and high cyclic loads. Fatigue cracks under high cyclic loading initiated close to the nugget edge, and decreasing the cyclic load nucleated the cracks farther from the nugget.

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A Fracture-Mechanics and System-Stiffness Approach to Fatigue Performance of Spot-Welded Sheet Steels

Cited by 50 publications

References 6 publications

Fatigue lives of friction stir spot welds in aluminum 6061-T6 sheets

Fatigue lives of friction stir spot welds in aluminum 6061-T6 sheets

Fatigue characterization and modeling of AZ31B magnesium alloy spot-welds

Characterization of magnesium spot welds under tensile and cyclic loadings

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