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Title: Influence of key test parameters on SPT results
Authors: Pathak, K K
Dwivedi, K K
Shukla, Manali
Ramadasan, E
Keywords: Small punch
finite element
load stroke
Issue Date: Dec-2009
Publisher: CSIR
Abstract: In order to assess the strength of aged material during the service life, small punch test (SPT) has emerged as a powerful NDT tool of engineers. It is a promising technique for those circumstances where only a small amount of material is available for characterization. SPT involves use of small size samples tested by bending or shearing to fracture in a specially designed die and punch assembly. As the sample and tooling sizes go down, the sensitivity of test parameters on the SPT output becomes an important issue. In order to get realistic material properties, sensitivity of test parameters should be studied. The parameters found to be critical can be given due attention. In this study, influence of several key parameters like fillet radius, ball diameter, sample thickness, yield stress and friction are studied using finite element simulations and their effects are critically examined. The analyses indicate that yield stress is less sensitive parameter as it does not affect peak load and corresponding displacement but fillet radius, ball diameter, plate thickness and friction considerably affect the value of peak load and corresponding displacement. So, these parameters must be precisely and carefully measured during small punch tests. Based on these findings, experimental load stroke data, obtained due to faulty test parameters, may be corrected rather than going for a new test with correct parameters.
Page(s): 385-389
ISSN: 0975-1017 (Online); 0971-4588 (Print)
Source:IJEMS Vol.16(6) [December 2009]

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