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This article studies the relationship between the small punch test (SPT) force and the tensile strength of materials. It is found that the SPT force at deflection of 0.85 mm is only related to the ultimate tensile strength of materials, and they are in a linear relationship. The SPT force at deflection of 0.30 mm is related to the yield strength and ultimate tensile strength of materials, and it presents a bilinear relationship. Based on the above findings, the finite element simulation is used to build a database of SPT forces and corresponding yield strength and ultimate tensile strength of materials, and then conversion formulas were developed to evaluate the yield strength and ultimate tensile strength of materials. In order to verify the accuracy of those formulas, SPT were carried out on 6 kinds of metals. The results showed that the maximum error in the evaluation of the yield and ultimate tensile strength of materials was less than 11%. The formula developed in this study is simple and accurate.

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An Experimental Study on Small Specimen Test as a Evaluation Method of Pressure Vessel in Oil and Gas Industry

  • 会议论文

  • 发表日期：

    2026年

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  • Mosong Li,
  • Bingcai Sun,
  • Xiao Zhang,
  • Jinrui Deng

摘要

This article studies the relationship between the small punch test (SPT) force and the tensile strength of materials. It is found that the SPT force at deflection of 0.85 mm is only related to the ultimate tensile strength of materials, and they are in a linear relationship. The SPT force at deflection of 0.30 mm is related to the yield strength and ultimate tensile strength of materials, and it presents a bilinear relationship. Based on the above findings, the finite element simulation is used to build a database of SPT forces and corresponding yield strength and ultimate tensile strength of materials, and then conversion formulas were developed to evaluate the yield strength and ultimate tensile strength of materials. In order to verify the accuracy of those formulas, SPT were carried out on 6 kinds of metals. The results showed that the maximum error in the evaluation of the yield and ultimate tensile strength of materials was less than 11%. The formula developed in this study is simple and accurate.