An investigation of the effect of the gap values between the overlap portions of the spot-welded pieces on fatigue life

Ertas, Ahmet H.; Yilmaz, Yasin; Baykara, Celalettin

doi:10.1243/09544062jmes787

Cited by 20 publications

(9 citation statements)

References 30 publications

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“…The influence of these factors on the fatigue behavior of spot welded joints made of AHSS has not been sufficiently taken into account. FE‐simulation as well as experimental investigation of spot welded structures with gaps of up to 0.2 mm have shown that the amount of stress near the notch root of the nugget increased, and this effect caused slightly lower fatigue strength 7, 8. Despite the reported observations there seems to be a lack of systematic studies especially for gap sizes between 1 and 4 mm which generally can happen in body shell mass production.…”

Section: Introductionmentioning

confidence: 98%

Study of Fatigue Behavior for Spot Welded Tensile Shear Specimens of Advanced High Strength Steels

Weber

Brauser

Gaul

et al. 2012

steel research int.

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For automotive body‐in‐white applications the influence of manufacture‐related gaps between the steel sheets and also of manufacture‐related surface cracks on the fatigue behavior of tensile shear specimens for spot welded TRIP steel was analyzed. It was shown that gaps between the steel sheets reduce the fatigue strength, whereas the fatigue behavior is neither influenced by cracks in the electrode indentation area nor in the heat effected zone.

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Section: Introductionmentioning

confidence: 98%

Study of Fatigue Behavior for Spot Welded Tensile Shear Specimens of Advanced High Strength Steels

Weber

Brauser

Gaul

et al. 2012

steel research int.

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“…All these analysis have been applied in specific standard test samples like tensile shear (TS), modified tensile shear (MTS), coach peel (CP), and modified coach peel (MCP). In this study, especially tensile shear, 1–11 (TS), modified tensile shear, 1–3,6,8 (MTS) and lap shear type 12–14 samples were reviewed in terms of predicting the fatigue life.…”

Section: Introductionmentioning

confidence: 99%

Parametric investigation into fatigue life behaviour of spot welded tensile shear test samples

Akbulut

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Resistance spot welding is a widely used joining process in the structural components of various engineering products such as white goods, aerospace equipment and especially automobiles. Hence it is crucial that the mechanical performance of such joints be well understood in order to design and manufacture reliable engineering products. In service, Spot-welded joints undergo fatigue failure under cyclic loadings. In order to examine and improve the fatigue life of spot welded structures, various assessment methods have been used on standardized test samples such as tensile shear (TS), modified tensile shear (MTS), coach peel (CP) and modified coach peel (MCP) specimens. The fatigue life studies have shown that among the most important design variables for spot-welded structures influencing joint strengths, sheet thickness, spot weld nugget diameter, number of spot welds and the joint type can be counted. In this study, a numerical examination was carried out to observe the effects of sheet thickness and nugget diameter on the fatigue life of tensile shear (TS) samples. In the analysis both Morrows mean stress and Coffin Manson approach were utilized. The performance of both methods was verified on the basis of experimental data available in literature. The elastic and plastic strains necessary for the calculations were found out by means of finite element method. The results presented herein provide variation of fatigue life predictions according to selected geometry parameters along with valuable interpretations that can be used as guidelines for designers.

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“…Spot welding technology has been widely used in various industrial fields, more so than other joining methods such as laser welding and friction stir welding, because it has the advantages of high workability, low cost and ease of automation. Spot welding accounts for approximately 90% of sheet metal assemblies in the automobile industry . This technology therefore plays an important role in the joining of thin structures.…”

Section: Introductionmentioning

confidence: 99%

“…Spot welding accounts for approximately 90% of sheet metal assemblies in the automobile industry. 10 This technology therefore plays an important role in the joining of thin structures.…”

Section: Introductionmentioning

confidence: 99%

Cumulative fatigue damage evaluations on spot‐welded joints using 590 MPa‐class automobile steel

Tanegashima

Ohara

Akebono

et al. 2015

Fatigue Fract Eng Mat Struct

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A B S T R A C T This study focused on local strain behaviour near the slit edge of spot-welded joints, where the fatigue crack initiated, and investigated methods of evaluating cumulative fatigue damage. A method of evaluating local strain amplitude by following modified Goodman's law gave almost the same result as an evaluation approach based on the external force and provided reasonable result on general strength design. An approach based on Smith-Watson-Topper's equation was easy to evaluate cumulative fatigue damage compared with the method based on modified Goodman's law and gave a good agreement with a criterion of the modified Miner's rule.Keywords fatigue damage; lap joints; mean stress effects; random loading; spot weld.cumulative fatigue damage value f = frequency [Hz] f 1 = lower value of the frequency [Hz] f u = upper value of the frequency [Hz] M = division number on the power spectrum n = actual cyclic number [cycles] N = estimated fatigue life [cycles] N f = number of cycles to failure [cycles] P a = force amplitude [kN] P B = tensile strength of the spot welded joints [kN] P Goodman,a = equivalent force amplitude evaluated following the modified Goodman's law [kN] P max = maximum force [kN] P mean = mean force [kN] P min = minimum force [kN]R p = force ratio S = power spectrum density function T = time x(t) = extreme values simulated following the stationary Gaussian random process at a certain time t. δ = residual of ε estimation,a and ε Goodman,a [με] Δω = division width of the angular frequency ε a = strain amplitude [με] ε B = fracture ductility [με] ε estimation,a = strain amplitude estimated using the regression curve of fatigue test results [με] ε Goodman,a = equivalent strain amplitude evaluated following the modified Goodman's law [με] ε max = maximum strain [με] Correspondence: A. Sugeta.

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An investigation of the effect of the gap values between the overlap portions of the spot-welded pieces on fatigue life

Cited by 20 publications

References 30 publications

Study of Fatigue Behavior for Spot Welded Tensile Shear Specimens of Advanced High Strength Steels

Study of Fatigue Behavior for Spot Welded Tensile Shear Specimens of Advanced High Strength Steels

Parametric investigation into fatigue life behaviour of spot welded tensile shear test samples

Cumulative fatigue damage evaluations on spot‐welded joints using 590 MPa‐class automobile steel

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