Fatigue Behavior of Gray Cast Iron under Torsional Loads
by
Daniel Joseph Weinacht
Abstract
Observations and results of constant amplitude completely reversed strain control fatigue tests are reported for a pearlitic gray cast iron. Both axial and torsional cyclic load cases have been investigated. A damage parameter based upon the product of the tensile stresses and strains (σmaxΔε/2) gives good correlation of all the fatigue tests performed. The specimens employed were produced using a developmental “lost foam” casting process. Defects present in the castings had a detrimental effect on fatigue life. A continuum damage model was used to account for the influence of the defects on fatigue life. Fatigue behavior of gray cast iron castings containing large inclusions and porosities has been quantified on the basis of smooth specimen uniaxial fatigue data.
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