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Investigation of the Variability of EPSTAL Steel Strength Parameters

Authors
  • Chmielewski, T.
  • Piotrowska, M.
Type
Published Article
Journal
Archives of Civil Engineering
Publisher
Sciendo
Publication Date
Sep 01, 2019
Volume
65
Issue
3
Pages
15–30
Identifiers
DOI: 10.2478/ace-2019-0031
Source
De Gruyter
Keywords
License
Green

Abstract

The paper deals with the variability of mechanical properties of EPSTAL steel rods produced in Polish steelworks, i.e. yield stress Re, tensile strength Rm, and elongation Agt. Our study is based on fundamental engineering static room-temperature tensile tests for large series specimens which have been made by manufacturers as the part of a factory quality control. Statistical analysis of these results shows that the stress-strain relationship of steel tensile tests should be described by a one-dimensional stochastic process, and three the most important mechanical parameters, i.e. the yield stress, tensile strength, and elongation by random variables. Based on the statistical elaboration of experimental data, it was found that the yield stress and tensile strength of steel rods produced in the years 2016 - 2017 had the coefficients of variation of less than 3%, and there is a reasonable basis for the manufacturer to increase the characteristic value of EPSTAL steel rods yield stress by a few percentages.

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