Browse Publications Technical Papers 1999-01-0024

Operant Friction Coefficient of Prephosphated Galvanneal under Punch Stretching 1999-01-0024

Finite element analysis of the limiting dome height (LDH) test has been conducted in order to determine the operant (or effective) friction coefficient pertaining to prephosphated galvanneal under punch stretching conditions. Simulation results indicate that an effective friction coefficient (μ) of about 0.05, which is substantially lower than the experimentally measured drawbead friction coefficient of 0.11, would be necessary to obtain the experimentally observed LDH formability enhancement with prephosphated galvanneal coating over a drawing quality steel substrate. The work also demonstrates that the effect of friction on dome height and minor strain at failure depends on specimen width and substrate strength level, with the relationship being quite nonlinear. The apparent difference in friction behavior between punch stretching and draw bead conditions raises concerns about the use of a single friction coefficient in computer simulation models that are widely used today for up-front die feasibility analysis.


Subscribers can view annotate, and download all of SAE's content. Learn More »


Members save up to 40% off list price.
Login to see discount.
Special Offer: With TechSelect, you decide what SAE Technical Papers you need, when you need them, and how much you want to pay.