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The presence of residual stresses in castings has been recognized for sometime, possibly because these stresses manifest themselves externally by causing distortion and occasionally cracking. The mechanism by which residual stresses in castings are caused, that of differential cooling, is understood in its general aspects. However, little is known of the specific effects on residual stress of such things as chemistry of the iron, geometry of the part, and foundry technique or of the average residual stress level that might be expected in a certain casting. Seeking answers to some of these questions, an investigation was conducted at the Caterpillar Tractor Co. of the residual stresses in engine cylinder blocks. This paper discusses the experimental methods used in the investigation and presents some of the results.
King, R. J.
Supervisor, Caterpillar Tractor Co., Peoria, Ill.