Examination of Mode I Loading on Resistance Spot Weld Groups in Tailored Hot Stampings

O’Keeffe, Cameron; Imbert-Boyd, Jose; Worswick, Michael J.; Butcher, Cliff; Malcolm, Skye; Dykeman, James; Penner, Pavlo; Yau, Cyrus; Soldaat, Ron; Bernert, Wille

doi:10.1016/j.proeng.2017.08.107

Cited by 4 publications

(3 citation statements)

References 6 publications

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“…The SCHAZ is a softer, more ductile zone, due to tempering of the pre-existing martensite phase. [12] C. Literature Review O'Keeffe et al [13] conducted cross-tension tests to examine failure of welds fabricated on fully hardened and tempered boron steel base materials. The tempered steel BM exhibited approximately 39 pct decrease in hardness compared to the fully hardened variant.…”

Section: B Phase Transformation Behavior and Weld Propertiesmentioning

confidence: 99%

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Raath

Norman

McGregor

et al. 2018

Metall Mater Trans A

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Boron steel, classed as an ultra high-strength steel (UHSS), has been utilized in anti-intrusion systems in automobiles, providing high strength and weight-saving potential through gage reduction. UHSS spot welds exhibit unique hardness distributions, with a hard nugget and outlying base material, but with a soft heat-affected zone in-between these regions. This soft zone reduces the strength of the weld and makes it susceptible to failure. Due to the interaction of various weld zones that occurs during loading, there is a need to characterize the loading response of the weld for accurate failure predictions. The loading response of certain weld zones, as well as failure loci, was obtained through physical simulation of the welding process. The results showed a significant difference in mechanical behavior through the weld length. An important result is that instrumented indentation was shown to be a valid, quantitative method for verifying the accuracy with which weld microstructure has been recreated with regard to the target weld microstructure.

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Section: B Phase Transformation Behavior and Weld Propertiesmentioning

confidence: 99%

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Raath

Norman

McGregor

et al. 2018

Metall Mater Trans A

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“…Weld failure was observed in the Usibor ® 1500-AS section due to the heat affected zone softening in high strength materials, so weld failure was added to the model. The failure parameters were calibrated through coupon testing and modeling performed by O'Keeffe et al [5]. The fade energy parameter was used to simulate the load sharing and pull out that occurs as a weld fails.…”

Section: Numerical Model Setupmentioning

confidence: 99%

“…Resistance spot welding is commonly used in automotive applications to fasten sheet metal parts without adding mass. Eller et al [4] and O'Keeffe et al [5] have studied the mechanical behaviour of spot welded hot stamped steels. The behaviour of joints in martensitic materials was observed to be controlled by the softened heat affected zone (HAZ) around the weld.…”

Section: Introductionmentioning

confidence: 99%

Dynamic and Quasi-Static Testing and Modeling of Hot Stamped Tailor-Welded Axial Crush Rails

Peister

O’Keeffe

Imbert

et al. 2018

The 18th International Conference on Experimental Mechanics

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In the current research, the use of tailor-welded blanks (TWBs) comprising Usibor® 1500-AS laser welded to more ductile Ductibor® 500-AS is considered. The TWBs were hot stamped to form top-hat cross-section channels with axially tailored properties. Axial crush rails were assembled by spot welding together two of these hot stamped channels along their flanges. The tailored rails were crush tested under dynamic (crash) and quasi-static conditions using an 855 kg crash sled facility at 10.6 m/s impact speed, and a 670 kN servo-hydraulic press at 0.5 mm/s, respectively. Non-tailored channels composed entirely of Ductibor® 500-AS were also tested for base material characterization and as a comparison to the tailored conditions. Numerical models of the crash experiments were developed. The material models include measured fracture loci using the generalized incremental stress state dependent damage model (GISSMO), with rate sensitive constitutive behavior. Spot weld failure was also considered based on tests of spot welded coupons. The accuracy of the predicted force-displacement and energy absorption response, extent of parent metal cracking, and extent of weld failure are evaluated in comparison to the experiments. The difference in response between quasi-static and dynamic testing is also evaluated.

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Failure characterization and meso-scale damage modeling of spot welds in hot-stamped automotive steels using a hardness-mapping approach

Mohamadizadeh

Biro

Worswick

2022

Engineering Fracture Mechanics

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Examination of Mode I Loading on Resistance Spot Weld Groups in Tailored Hot Stampings

Cited by 4 publications

References 6 publications

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Characterization of Loading Responses and Failure Loci of a Boron Steel Spot Weld

Dynamic and Quasi-Static Testing and Modeling of Hot Stamped Tailor-Welded Axial Crush Rails

Failure characterization and meso-scale damage modeling of spot welds in hot-stamped automotive steels using a hardness-mapping approach

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