Publication detail

SPT results evaluation

VARNER, M. KOULA, V. KRAUSOVÁ, H.

Original Title

SPT results evaluation

English Title

SPT results evaluation

Type

conference paper

Language

en

Original Abstract

Small punch test (SPT) is known as a powerful NDT tool for material properties determination of existing structures. The paper presents a description and results of SPT computer simulations performed with the steels in a wide range of yield strength and tensile strength. The true tension diagrams of these steels are created by the Hollomon's formula. Conventional mechanical properties of the steels are verified from the results of computer simulation of tensile tests, too. True mechanical properties are used for SPT simulation of steels. Relationships of loads and puncher displacements are shown in the paper. Subsequently parameters SPT, i.e. the maximum load, puncher displacement at maximum load, plastic tangent at the initial stage of SPT and "yield load" are carried out. Intersection of plastic tangent and axis of load determines "yield load". Causal relations between the characteristics of static strength steels and SPT parameters are shown as graphic results. Quite notable is the influence of hardening exponent in causal relations and correlation of yield strength with "yield load". Two generally independent methods of estimating of yield strength and tensile strength from SPT results are presented. These methods are based either on causal relationships or derived regression models.

English abstract

Small punch test (SPT) is known as a powerful NDT tool for material properties determination of existing structures. The paper presents a description and results of SPT computer simulations performed with the steels in a wide range of yield strength and tensile strength. The true tension diagrams of these steels are created by the Hollomon's formula. Conventional mechanical properties of the steels are verified from the results of computer simulation of tensile tests, too. True mechanical properties are used for SPT simulation of steels. Relationships of loads and puncher displacements are shown in the paper. Subsequently parameters SPT, i.e. the maximum load, puncher displacement at maximum load, plastic tangent at the initial stage of SPT and "yield load" are carried out. Intersection of plastic tangent and axis of load determines "yield load". Causal relations between the characteristics of static strength steels and SPT parameters are shown as graphic results. Quite notable is the influence of hardening exponent in causal relations and correlation of yield strength with "yield load". Two generally independent methods of estimating of yield strength and tensile strength from SPT results are presented. These methods are based either on causal relationships or derived regression models.

Keywords

simulation, small punch test, evaluation, mechanical properties of steel, finite element method

RIV year

2013

Released

05.11.2013

Publisher

Vysoké učení technické v Brně

Location

Brno

ISBN

978-80-214-4799-8

Book

NDE for Safety/Defektoskopie 2013

Edition

2013

Edition number

1

Pages from

213

Pages to

220

Pages count

322

Documents

BibTex


@inproceedings{BUT109061,
  author="Miroslav {Varner} and Václav {Koula} and Hana {Krausová}",
  title="SPT results evaluation",
  annote="Small punch test (SPT) is known as a powerful NDT tool for material properties determination of existing structures. The paper presents a description and results of SPT computer simulations performed with the steels in a wide range of yield strength and tensile strength. The true tension diagrams of these steels are created by the Hollomon's formula. Conventional mechanical properties of the steels are verified from the results of computer simulation of tensile tests, too. True mechanical properties are used for SPT simulation of steels. Relationships of loads and puncher displacements are shown in the paper. Subsequently parameters SPT, i.e. the maximum load, puncher displacement at maximum load, plastic tangent at the initial stage of SPT and "yield load" are carried out. Intersection of plastic tangent and axis of load determines "yield load". Causal relations between the characteristics of static strength steels and SPT parameters are shown as graphic results. Quite notable is the influence of hardening exponent in causal relations and correlation of yield strength with "yield load". Two generally independent methods of estimating of yield strength and tensile strength from SPT results are presented. These methods are based either on causal relationships or derived regression models.",
  address="Vysoké učení technické v Brně",
  booktitle="NDE for Safety/Defektoskopie 2013",
  chapter="109061",
  edition="2013",
  howpublished="print",
  institution="Vysoké učení technické v Brně",
  year="2013",
  month="november",
  pages="213--220",
  publisher="Vysoké učení technické v Brně",
  type="conference paper"
}