Estimation of yield and ultimate stress using the small punch test method applied to non-standard specimens: A computational study validated by experiments

E. Priel, B. Mittelman, S. Haroush, A. Turgeman, R. Shneck, Y. Gelbstein

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

In the last few decades there is a continuous demand for characterization of mechanical properties of metals and alloys using small specimens. This is especially true in the nuclear industry due to the limited number of irradiated standard specimens and strict safety regulations. One common method for small specimen testing is the Small Punch Test (SPT) method. In a previous publication by the authors, it was demonstrated that the accuracy in estimation of material yield and ultimate stress from classical analysis of SPT experiments deteriorates as specimen thickness decreases below t0 = 300 µm. As a result, the classical equations for analysis of the SPT need to be corrected to be applicable to non-standard thin specimens. In the current study the finite element method incorporating a ductile damage model was used to investigate the SPT method applied to two very different representative materials with thickness values in the range of t0 = 100 − 500 µm. The effect of SPT system setup on the load displacement curves was also examined. The thorough theoretical study enabled the formulation of novel correction functions for yield stress estimation which are independent of the material stress-strain response. An additional correction function for estimation of the ultimate stress based on strain energy and specimen thickness is also proposed. The proposed correction functions were validated using Tensile and SPT experiments on t0 = 100, 200 µm thick SS316 L (Stainless Steel, grade 316 L). It is demonstrated that by applying the novel correction functions, a very good estimation of the yield and ultimate stress can be obtained from analysis of the SPT experiments.

Original languageEnglish
Pages (from-to)484-498
Number of pages15
JournalInternational Journal of Mechanical Sciences
Volume135
DOIs
StatePublished - 1 Jan 2018

Keywords

  • Finite elements
  • Material properties
  • Metals and alloys
  • Small punch test
  • Thin foils

Fingerprint

Dive into the research topics of 'Estimation of yield and ultimate stress using the small punch test method applied to non-standard specimens: A computational study validated by experiments'. Together they form a unique fingerprint.

Cite this