Fracture behaviour and numerical study of resistance spot welded joints in high-strength steel sheet

Sadasue, Teruki; Igi, Satoshi; Taniguchi, Koichi; Ikeda, Rinsei; Oi, Kenji

doi:10.1080/09507116.2016.1142187

Cited by 16 publications

(13 citation statements)

References 7 publications

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“…This explains the sharp drop in the load and simultaneous rapid increase in the crack length and crack opening after exceeding the peak load. The predicted crack propagation in Figure 10 is consistent with the experimental observation [8].…”

Section: Fe Prediction 3: Applying Cz Model To If Modesupporting

confidence: 86%

“…8b that the increase in stress on the fastening bolts is accompanied by the rapid increase in load, and this two-stage load-displacement curve has been observed in Ref. [6]. The sliding becomes negligible with increasing friction between the CT sample and the jigs, as the transition point of the load-displacement curve at ~10.5 kN disappeared in the case of 'F = 100,000N, f1 = 0.15, f2 = 0.25 ' (Fig.…”

Section: Fe Input 3: Boundary Conditionssupporting

confidence: 52%

“…As for numerical studies on weld failure, FE modelling has been recognised as an appealing tool for predicting the nonlinear response of spot welds during loading [7]. The following factors have been numerically investigated, notch shape [8], base metal strength, nugget diameter and HAZ softening [9]. To simulate the PF mode, a failure strain was considered in the damage models in Refs.…”

Section: Introductionmentioning

confidence: 99%

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An integrated approach for numerically predicting the failure of resistance spot welds

Wang

Kasuya

Kondo

et al. 2022

Science and Technology of Welding and Joining

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In this study, a numerical approach was proposed to predict the failure of resistance spot welds, into which theoretical and empirical models as well as finite element (FE) model are integrated. In this approach, the hardness of spot welds was first evaluated and the estimated hardness was then used to determine the local mechanical properties. The weld geometry and boundary conditions were faithfully followed when generating the FE model. A Gurson-type damage model and a cohesive zone model were simultaneously considered for the two main failure modes, i.e. pull-out failure and interface failure. The predictions were validated by experimental observations. The successful estimation of critical nugget size, as an exemplary application, demonstrated the utility and reliability of this approach.

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Section: Fe Prediction 3: Applying Cz Model To If Modesupporting

confidence: 86%

Section: Fe Input 3: Boundary Conditionssupporting

confidence: 52%

Section: Introductionmentioning

confidence: 99%

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An integrated approach for numerically predicting the failure of resistance spot welds

Wang

Kasuya

Kondo

et al. 2022

Science and Technology of Welding and Joining

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“…8,10) In addition, the fracture behavior of spot-welded part has been elucidated using numerical analysis consideirng the fracture surface observation and the crack initiation and progression observation of the CTS. 11) Therefore, in this study, the tensile properties of spotwelded TRIP-aided martensitic (TM) 3,4) steel sheets were investigated to improve the formability (ductility and toughness) of ultrahigh-strength steel sheets after the hot stamping, and to clarify the tensile properties of TM steel sheet with spot-welded joints. Table 1 shows the chemical composition of the steel sheets used.…”

Section: Introductionmentioning

confidence: 99%

Spot-Welded Tensile Properties in Automobile Ultrahigh-Strength TRIP-Aided Martensitic Steel Sheet

et al. 2021

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Effect of heat-affected zone (HAZ) softening on tensile strength (TS) and total elongation (TEl) of spotwelded automobile ultrahigh strength TRIP-aided martensitic (TM) steel sheet was investigated for automobile applications. Tensile test was performed on an Instron type tensile testing machine at a crosshead speed of 3 mm/min (strain rate of 8.3 × 10 − 4 s − 1), using spot-welded specimen. The results are as follows. (1) The spot-welded specimen at the current value (I) of 6.5 kA for the TM steel with the maximum tensile stress (TS *) of 1 450 MPa and the fracture elongation (TEl *) of 7.0% was superior to that of hot stampted (HS1) steel sheet and it was found that the TS * and the TEl * for the TM steel possessed same level as those of base metal specimen for the HS1 steel with the tensile strength (TS) of 1 469 MPa and the total elongation (TEl) of 7.7%. (2) The TRIP effect for the TM steel with an excellent strength-ductility balance (TS × TEl) of 14.4 GPa% (i.e. the tensile strength (TS) of 1 532 MPa and the total elongation (TEl) of 9.4%) suppressed the HAZ softening and was able to express a high maximum stress (TS *) of 1 450 MPa of the spot-welded specimen for the TM steel.

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“…Wan et al 20 simulated RSW of Al to zinc-coated steel with improved contact interactions. Mikno and Bartnik 21 evaluated heating of electrodes during RSW in the FEM calculations and Sadasue et al 22 investigated the fracture behavior and numerical modeling of resistance spot welded joints in highstrength steel sheet.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the effect of sheet thickness on residual stresses in resistance spot welding of aluminum sheets

Sedighi

Afshari

Nazari

2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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The main purpose of this study is to investigate the effect of sheet thickness on nugget size and residual stresses in resistance spot welding. A two-dimensional coupled electro-thermo-mechanical finite element model is employed to predict the residual stresses in aluminum alloy 6061-T6. The simulation results are compared with the results obtained from the experimental nugget size and the residual stresses are measured by the X-ray diffraction method. The results indicate that the highest tensile residual stress occurs at the center of the nugget and diminish along the nugget radius. The residual stresses increase on increasing the electrical current and reducing the welding time. By increasing the sheet thickness, the affordable range of welding current and welding cycle increase. It also leads to the enlargement of the nugget, which consequently results in the increase of the residual stresses.

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Fracture behaviour and numerical study of resistance spot welded joints in high-strength steel sheet

Cited by 16 publications

References 7 publications

An integrated approach for numerically predicting the failure of resistance spot welds

An integrated approach for numerically predicting the failure of resistance spot welds

Spot-Welded Tensile Properties in Automobile Ultrahigh-Strength TRIP-Aided Martensitic Steel Sheet

Investigation of the effect of sheet thickness on residual stresses in resistance spot welding of aluminum sheets

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