Modeling Cyclic Deformation and Fatigue Behavior of Cast Iron under Uniaxial Loading
by
Stephen Douglas Downing
Department of Mechanical and Industrial Engineering
Abstract
A model for estimating cyclic deformation behavior of cast irons under unaxial loadng is described. The model separates total response into components due to symmetrical elastic/plastic response in the matrix/graphite composite and to the nonlinear elastic response of the free graphite phase. Predictions are compared to experimental data for gray cast iron, compacted graphite cast iron and nodular iron.
A continuum damage model for fatigue analysis of cast iron is also discussed. The model considers damage to be a global measure of surface crack growth. Several easily measured bulk deformation parameters are studied as alternate measures of damage. The model is compared with Miner’s Rule for gray iron under various loading histories.
Finally, the cyclic deformation model is extended to include transient effects due to surface crack growth and compared to experimental data for gray iron.
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