Failure Prediction of Boron Steels in Crash

Lanzerath, Horst; Bach, Aleksandar; Oberhofer, Gernot; Gese, Helmut

doi:10.4271/2007-01-0989

Cited by 6 publications

(2 citation statements)

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“…An improvement would be to use a central-hole tensile specimen. [29] In terms of instrumented indentation tests, only representative values of the a coefficient could be obtained by Kim, [22] due to difficulties in directly tensile testing the HAZ. The author stated that sharp microstructural changes in the HAZ could have a significant effect on the value of a.…”

Section: B Phase Transformation Behavior and Weld Propertiesmentioning

confidence: 99%

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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%

“…Lanzerath [29] reported that standard dog-bone specimens cannot be used in the development of a failure locus. This is due to the need to keep the stress state constant during deformation until failure occurs.…”

Section: Obtaining Tensile Destructive Geometries From Gleeble Samplesmentioning

confidence: 99%