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Development and Validation of a Shear Punch Test Fixture

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Technical Report

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FACTS Engineering Inc Halifax, NS United States

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An experimental shear punch assembly has been designed and fabricated for the evaluation of mechanical strength properties of metallic materials. The shear punch tester uses very small, thin specimens to evaluate shear behaviour of materials, the results of which can be correlated to tensile behaviour of the material. The apparatus provides a means of evaluating the mechanical properties of metal matrix composites MMC manufactured by friction stir processing FSP that are being developed as part of a Technology Investment Fund TIF project, as the volume of materials produced are too small for conventional tensile test methods. The shear punch apparatus has a similar basic design to those described in the literature however a close-coupled compression force transducer and the direct measurement of specimen displacement response during the test procedure have been incorporated. This provides a direct measurement of both force and specimen displacement which improves the accuracy of the measured material response. This report also details the validation of the apparatus using 3xxx series aluminum specimens. The results indicate that for a given punch diameter and specimen thickness combination, the calculated effective yield stress, ultimate stress and strain are generally reproducible.

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