On the correlation of hardness with tensile and yield strength

Research output: Book/ReportReport

9 Citations (Scopus)

Abstract

The relations between hardness and tensile properties of common metals have been reviewed and compared with available experimental data. Using the Cahoon formula the correlation of hardness with tensile strength is generally good (difference usually less than ± 10 %) provided that the strain hardening exponent n is known or can be estimated. The corresponding correlation with yield strength is somewhat less impressive but still reasonable (difference usually less than ± 15 %) if the value of n remains approximately constant and characterises the original material. Less satisfactory correlations may be obtained for multiphase materials or materials showing microstructural changes during plastic straining. Reliable determination of n from hardness-type indentations has not proved to be easy, and seems especially difficult to obtain from the same standard type hardness indentation which is used for hardness measurement. In spite of these limitations the available expressions correlating hardness with yield and tensile strength can be considered very useful.
Original languageEnglish
Place of PublicationEspoo
PublisherVTT Technical Research Centre of Finland
Number of pages20
ISBN (Print)951-38-2650-3
Publication statusPublished - 1986
MoE publication typeD4 Published development or research report or study

Publication series

SeriesValtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Number416
ISSN0358-5077

Fingerprint

Yield stress
Tensile strength
Hardness
Indentation
Tensile properties
Strain hardening
Plastics
Metals

Keywords

  • hardness
  • tensile strength
  • yield strength

Cite this

Auerkari, P. (1986). On the correlation of hardness with tensile and yield strength. Espoo: VTT Technical Research Centre of Finland. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, No. 416
Auerkari, Pertti. / On the correlation of hardness with tensile and yield strength. Espoo : VTT Technical Research Centre of Finland, 1986. 20 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 416).
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Auerkari, P 1986, On the correlation of hardness with tensile and yield strength. Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports, no. 416, VTT Technical Research Centre of Finland, Espoo.

On the correlation of hardness with tensile and yield strength. / Auerkari, Pertti.

Espoo : VTT Technical Research Centre of Finland, 1986. 20 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 416).

Research output: Book/ReportReport

TY - BOOK

T1 - On the correlation of hardness with tensile and yield strength

AU - Auerkari, Pertti

PY - 1986

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N2 - The relations between hardness and tensile properties of common metals have been reviewed and compared with available experimental data. Using the Cahoon formula the correlation of hardness with tensile strength is generally good (difference usually less than ± 10 %) provided that the strain hardening exponent n is known or can be estimated. The corresponding correlation with yield strength is somewhat less impressive but still reasonable (difference usually less than ± 15 %) if the value of n remains approximately constant and characterises the original material. Less satisfactory correlations may be obtained for multiphase materials or materials showing microstructural changes during plastic straining. Reliable determination of n from hardness-type indentations has not proved to be easy, and seems especially difficult to obtain from the same standard type hardness indentation which is used for hardness measurement. In spite of these limitations the available expressions correlating hardness with yield and tensile strength can be considered very useful.

AB - The relations between hardness and tensile properties of common metals have been reviewed and compared with available experimental data. Using the Cahoon formula the correlation of hardness with tensile strength is generally good (difference usually less than ± 10 %) provided that the strain hardening exponent n is known or can be estimated. The corresponding correlation with yield strength is somewhat less impressive but still reasonable (difference usually less than ± 15 %) if the value of n remains approximately constant and characterises the original material. Less satisfactory correlations may be obtained for multiphase materials or materials showing microstructural changes during plastic straining. Reliable determination of n from hardness-type indentations has not proved to be easy, and seems especially difficult to obtain from the same standard type hardness indentation which is used for hardness measurement. In spite of these limitations the available expressions correlating hardness with yield and tensile strength can be considered very useful.

KW - hardness

KW - tensile strength

KW - yield strength

M3 - Report

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BT - On the correlation of hardness with tensile and yield strength

PB - VTT Technical Research Centre of Finland

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ER -

Auerkari P. On the correlation of hardness with tensile and yield strength. Espoo: VTT Technical Research Centre of Finland, 1986. 20 p. (Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports; No. 416).