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This is an example of the stress analysis that Allwest Compressors performs when designing pistons. A sectioned contour map like the one shown aids the designer when choosing weight distribution, fillet sizing, etc.

Various operating parameters can be included in the analysis (separately or combined). These conditions are:


In this example, constraints were applied to the piston hub on the right side in the washer counterbore. 100 PSI of pressure was applied to the left face of the piston. No other external loads were applied. The 20.5" Canadian Ingersoll Rand piston modeled consists of (2) aluminum sections held together by (1) steel ring carrier and weighs 295 lbs. The solid magenta contour illustrates the areas of lowest stress, with the highest stress being shown in red. In this case, because of the low pressure application, high stress is only encountered near and around the yellow contour. This piston shows no danger of failure thru the face or hub.

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