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A stress free model for residual stress assessment using thermoelastic stress analysis

A stress free model for residual stress assessment using thermoelastic stress analysis
A stress free model for residual stress assessment using thermoelastic stress analysis
Thermoelastic Stress Analysis (TSA) has been proposed as a method of obtaining residual stresses. The results of a preliminary study demonstrated that when Al-2024 plate containing holes that were plastically deformed by cold expansion process to 2% and 4% strain the thermoelastic response in the material around the hole was different to that obtained from a plate that had not experienced any plastic cold expansion (i.e. a reference specimen). This observation provides an opportunity for obtaining residual stresses based on TSA data. In many applications a reference specimen (i.e. residual stress free specimen) may not be available for comparison, so a synthetic, digital bitmap has been proposed as an alternative. An elastic finite element model is created using commercially available software Abaqus/Standard and the resultant stress field is extracted. The simulated stress field from the model is mapped onto a grid that matches the TSA pixel data from a physical reference specimen. This stress field is then converted to a ?T/T field that can be compared to the full-field TSA data. When the reference experimental data is subtracted from the, bitmap dataset the resultant ?T/T field is approximately zero. Further work proposes replacing the experimental reference data with that from specimens that have undergone cold expansion with the aim of revealing the regions affected by residual stress through a departure from zero in the resultant stress field. The paper demonstrates the first steps necessary for deriving the residual stresses from a general specimen using TSA.
finite element, plastic strain, residual stress, thermoelastic stress analysis, tsa
Howell, Geoff
63b72d7f-adf2-447d-8121-772d44c3b6c5
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Dulieu-Barton, Janice
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Robinson, Andy
8cb79fde-823e-4ff8-8d9f-b2a4288e1768
Howell, Geoff
63b72d7f-adf2-447d-8121-772d44c3b6c5
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Dulieu-Barton, Janice
9e35bebb-2185-4d16-a1bc-bb8f20e06632
Robinson, Andy
8cb79fde-823e-4ff8-8d9f-b2a4288e1768

(2014) A stress free model for residual stress assessment using thermoelastic stress analysis. International Conference on Experimental Mechanics (icEM2014), Singapore. 15 - 17 Nov 2014.

Record type: Conference or Workshop Item (Paper)

Abstract

Thermoelastic Stress Analysis (TSA) has been proposed as a method of obtaining residual stresses. The results of a preliminary study demonstrated that when Al-2024 plate containing holes that were plastically deformed by cold expansion process to 2% and 4% strain the thermoelastic response in the material around the hole was different to that obtained from a plate that had not experienced any plastic cold expansion (i.e. a reference specimen). This observation provides an opportunity for obtaining residual stresses based on TSA data. In many applications a reference specimen (i.e. residual stress free specimen) may not be available for comparison, so a synthetic, digital bitmap has been proposed as an alternative. An elastic finite element model is created using commercially available software Abaqus/Standard and the resultant stress field is extracted. The simulated stress field from the model is mapped onto a grid that matches the TSA pixel data from a physical reference specimen. This stress field is then converted to a ?T/T field that can be compared to the full-field TSA data. When the reference experimental data is subtracted from the, bitmap dataset the resultant ?T/T field is approximately zero. Further work proposes replacing the experimental reference data with that from specimens that have undergone cold expansion with the aim of revealing the regions affected by residual stress through a departure from zero in the resultant stress field. The paper demonstrates the first steps necessary for deriving the residual stresses from a general specimen using TSA.

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More information

Published date: 16 November 2014
Venue - Dates: International Conference on Experimental Mechanics (icEM2014), Singapore, 2014-11-15 - 2014-11-17
Keywords: finite element, plastic strain, residual stress, thermoelastic stress analysis, tsa
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 371918
URI: http://eprints.soton.ac.uk/id/eprint/371918
PURE UUID: 5f9e399c-8b6d-40ba-8980-c4be78fe66cc
ORCID for Mithila Achintha: ORCID iD orcid.org/0000-0002-1732-3514

Catalogue record

Date deposited: 24 Nov 2014 13:10
Last modified: 13 Jun 2019 00:32

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Contributors

Author: Geoff Howell
Author: Mithila Achintha ORCID iD
Author: Andy Robinson

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