The Effects of Friction Coefficient on Formability Behaviour of Dual Phase Steel

Abstract

The effects of friction coefficient on formability behavior of advanced high-strength steel sheets have been examined in this study. For this purpose, forming analysis has been conducted by stretching the three different steel sheets such as DP600, DP800 and DP1000. Forming processes have been done by using punch that has different friction coefficients (0.05, 0.15, 0.3, 0.6 µ) in nakajima forming die. As a result of the analysis, it has been observed that thinning amount and forming force have increased by the increasing in the friction coefficient. When major and minor deformations on the sheet have been examined, it has been determined that the increasing friction coefficient makes plastic deformation amount increase.

Sheet thinning prediction method based on localized friction effect in deep-drawing

“…15 The influences of friction on the formability of steel sheets were examined by Tekaut. 16,17 According to the aforementioned studies, different areas in deep-drawing should be under different friction conditions or having a variable coefficient of friction (VCOF) to obtain the highest formability results. Nevertheless, one of the main challenges in deepdrawing is to integrate VCOF in the process because the effect of variable friction conditions depends on many factors such as materials, geometries, and loading conditions.…”

“…15 The influences of friction on the formability of steel sheets were examined by Tekaut. 16,17 According to the aforementioned studies, different areas in deep-drawing should be under different friction conditions or having a variable coefficient of friction (VCOF) to obtain the highest formability results.…”