Digital Repository, ICF12, Ottawa 2009

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Effective Strain-Fatigue Life of Dual Phase 590 Steel
M. El-Zeghayar, T. Topper, J. Bonnen, R. Sohmshetty

Last modified: 2013-05-03


Dual phase 590 steel belongs to the family of advanced high strength steels
(AHSS) that has gained popularity in the automotive industry as lightweight
vehicle components. An experimental study on dual phase (DP) 590 as-received
steel was conducted to study the effect of variable amplitude loading on the
fatigue life and construct the effective strain-life curve for the material. Overloads
were applied in the form of large near yield stress cycles that decreased the crack
opening stress for the subsequent smaller cycles. An effective strain-life curve
was derived from constant amplitude and overload tests, and a crack opening
stress equation was calibrated by a comparison of constant amplitude and
effective strain ranges at given fatigue lives. It was also noticed that the material
even at a life of 107 cycles exhibited significant plastic strain amplitudes that
deviated from the single slope behavior of a Coffin-Manson equation.

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