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.
Highlights
When the sheet metal materials used in the automotive sector are examined, it is seen that the materials which provide light and high strength are preferred
It is known that the thinning amount, forming limit diagrams and forming force are effected in the stretch forming process while determining the formability of sheet metal materials[5]
It has been observed that the effects of friction coefficient on forming of dual phase steel sheets are not examined even if it is widely used in the automotive industry
Summary
When the sheet metal materials used in the automotive sector are examined, it is seen that the materials which provide light and high strength are preferred. Reducing vehicle weight that decreases carbon emissions and fuel consumption results in environmental and economic gains For this purpose, the use of advanced high strength steels developed in the automotive industry has increased[1,2]. Karupannasamy et al have examined the effect of lubrication in the deep drawing process by using finite element method in their study They have concluded that the friction coefficient is not constant in the forming process[7]. The effects of the friction coefficient have been compared on the forming of three different advanced high-strength dual phase steel sheet such as DP600, DP800 and DP1000
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