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Influence of Friction on the Response of Small Punch Test

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Abstract

Small specimen test techniques are suitable for assessing the current mechanical properties of in-service components using small volume samples compared to conventional tests. Small punch test is a reliable test method for predicting the post-yield response. The effect of lubrication of the punch-specimen interface on the load–displacement response and strain distribution in the specimen is presented here. Lubricating the punch-specimen interface reduces the ultimate load and also moves the failure site closer to the pole of the punch. It is found that the loading slope changes as a function of displacement. However, its effect on the plastic properties like strength coefficient and strain hardening exponent was considerably less (~6 % with respect to dry condition). Interrupted tests were conducted at different fractions of ultimate load which revealed that the peak strain was greater in dry condition than the lubricated case.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Indian Institute of Technology Madras, Chennai, 600 036, India

    Raghu V. Prakash & S. Arunkumar

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  1. Raghu V. Prakash
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  2. S. Arunkumar
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Correspondence to Raghu V. Prakash.

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Prakash, R.V., Arunkumar, S. Influence of Friction on the Response of Small Punch Test. Trans Indian Inst Met 69, 617–622 (2016). https://doi.org/10.1007/s12666-015-0769-4

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  • DOI: https://doi.org/10.1007/s12666-015-0769-4

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