Modelling of Friction in Hot Stamping

Venema, Jenny; Atzema, Eisso; Hazrati, Javad; Matthews, D.T.A.; Boogaard, A.H. van den

doi:10.1016/j.promfg.2020.04.184

Cited by 9 publications

(11 citation statements)

References 13 publications

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“…In normal loading flattening conditions, earlier investigations [21] showed that both fracture and flattening occur. The cross-sections and SEM analyses show that voids directly underneath the surface layer are crushed.…”

Section: Normal Loading Testsmentioning

confidence: 92%

“…To investigate the effect of temperature on the fracture of AlSi coating, normal load tests, friction tests, tensile tests and hot stamping of a B-pillar are performed. More information can be found in [10,14,18,21]. Information on the test process parameters can be found in Table 1.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The cross-sections and SEM analyses show that voids directly underneath the surface layer are crushed. In general, a higher fractional real contact area is observed for higher pressure and higher temperatures due to softer material behaviour [21].…”

Section: Normal Loading Testsmentioning

confidence: 99%

“…Furthermore, recent publications on lab-scale experiments neglect the effect of strain state in the sheet metal on AlSi coating fracture. Studies on lab scale experiments (normal load, hot friction tests and uniaxial tensile tests) were already published [10,14,18,21] by the authors. To enable translation of lab-scale experiments to real hot stamping applications, a summary of the lab scale tests results is made.…”

Section: Introductionmentioning

confidence: 99%

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Temperature and strain dependent fracture of AlSi coating in hot stamping of press hardening steel

et al. 2022

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In hot stamping severe tool wear occurs. The main tool wear mechanism is the so-called compaction galling, in which fractured particles from the coating of the part (blank) being build-up and become compacted upon the tools. Since fractured particles play an important role in the wear mechanism, fracture of the AlSi coating is investigated. For this purpose, simplified B-pillar parts are pressed at several temperatures to investigate the effect of temperature, strain and tool contact on the fracture behavior of the AlSi coating. Three positions which exhibit different strain modes are analysed by means of optical topography and optical microscopy measurements. The results indicate a strong correlation between the AlSi coating fracture, strain and temperature. For instance, at relatively low forming temperatures (i.e. 650 ºC), mode I fracture as well as spallation of the coating and at higher temperatures (750 and 800 ºC) mainly mode I coating fractures are observed. Interestingly, this type of mode I coating fractures are found to widen, eventually giving rise to mode II coating fractures along the coating-substrate interface. The onset strain of coating fracture is low and approximately at strains of 0.017, coating cracks are observed at all start temperatures. At contact-dominated regions, additional coating cracks are observed mainly due to a drop in blank temperature and added shear stresses due to the relative sliding between the blank and tools.

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Section: Normal Loading Testsmentioning

confidence: 92%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Normal Loading Testsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Temperature and strain dependent fracture of AlSi coating in hot stamping of press hardening steel

et al. 2022

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“…For instance, at non-contact locations, mode-I coating fracture is determined by the loading history of the blank [25]. However, at contact locations, coating fracture is severe, indicating mixed-mode coating fracture [57]. The aim of this chapter is to predict the severity of coating fracture during the industrial hot stamping process.…”

Section: Introductionmentioning

confidence: 99%