The development of a material model to estimate the S-N response of a cast aluminum alloy is described. An important requirement of such a model is sensitivity to processing effects such as solidification time and subsequent material characteristics such as secondary dendrite arm spacing (SDAS), strength, and porosity. It has been speculated that the fatigue properties of aluminum castings are dominated by the propagation of cracks which initiate from microshrinkage pores ranging in size from ∼ 10 to 1000 μm. A model was developed that calculates fatigue life based on small crack growth rates measured in cast 319 aluminum specimens with two different solidification times. Results from this small crack model are compared with predictions from a traditional LEFM model using long-crack data and measured thresholds.
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