An Enhanced Method to Evaluate Tensile Yield Stress by Small Punch Tests Using Deflection Curves


GÜLÇİMEN ÇAKAN B. , Hahner P., Soyarslan C., Bargmann S.

MATERIALS, vol.13, no.12, 2020 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 13 Issue: 12
  • Publication Date: 2020
  • Doi Number: 10.3390/ma13122840
  • Title of Journal : MATERIALS

Abstract

While force-displacement curves are often preferred in Small Punch (SP) tests due to the ease of the experimental set-up, they encompass significant uncertainties arising from frame compliance. In this work, a methodology is presented to predict yield stresses from the force vs. deflection curves. The present method relies on determining different force levels from the initial part of the force-deflection curve to reflect both the slope and the curvature instead of using a single force level only. The predicted yield stresses for different types of materials, that is, low- and high-strength alloys, are found to be in good agreement with the actual proof stresses with a maximum error of 16%.