| The stress distributions in an aluminum rod developed during guenching in 43℃ water from the temperature of 600℃ have been calculated using finite element method. In calculating the transient temperature field, the heat flux between the water arid the rod surface was calculated using the heat transfer coefficient. The stress and strain distributions were calulated using the thermo-elastoplastic model. The effect of creep was neglected because the rod, diameter of which was 5㎝, was exposed for a time period which is too short for the development of significant creep strains. At the beginning of cooling, compressive stresses were developed in the core, while tensile stresses in the surface layer. The stress disturbance occured 2 to 4 seconds after quenching, during which the largest temperature gradient developed, and finally the tensile stresses developed in the core while the compressive stresses in the surface layer. |
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