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Eigenstrain modelling of residual stresses generated by laser shock peening

Eigenstrain modelling of residual stresses generated by laser shock peening
Eigenstrain modelling of residual stresses generated by laser shock peening
This paper presents an eigenstrain (misfit strain) model to predict the residual stresses (RS) generated by laser shock peening. The stresses generated in the workpiece due to propagation of the shock wave cause plastic deformation in the top layers of the specimen, and on relaxation the deformed material is loaded in compression by the surrounding undeformed material causing a RS field. In the present model the shock wave is first modelled as a dynamic pressure load in an explicit finite element (FE) model and the stabilised plastic strain distribution extracted from this analysis is incorporated as an eigenstrain distribution in a static FE model. The RS distribution generated by the original laser shock is obtained as the elastic response to the Eigenstrain.
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Nowell, David
63daaf71-e1e5-4d86-9ce9-586f82c4f12a
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Nowell, David
63daaf71-e1e5-4d86-9ce9-586f82c4f12a

Achintha, Mithila and Nowell, David (2011) Eigenstrain modelling of residual stresses generated by laser shock peening. 11th International Conference on the Mechanical Behavior of Materials, Italy.

Record type: Conference or Workshop Item (Paper)

Abstract

This paper presents an eigenstrain (misfit strain) model to predict the residual stresses (RS) generated by laser shock peening. The stresses generated in the workpiece due to propagation of the shock wave cause plastic deformation in the top layers of the specimen, and on relaxation the deformed material is loaded in compression by the surrounding undeformed material causing a RS field. In the present model the shock wave is first modelled as a dynamic pressure load in an explicit finite element (FE) model and the stabilised plastic strain distribution extracted from this analysis is incorporated as an eigenstrain distribution in a static FE model. The RS distribution generated by the original laser shock is obtained as the elastic response to the Eigenstrain.

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More information

Published date: 6 June 2011
Venue - Dates: 11th International Conference on the Mechanical Behavior of Materials, Italy, 2011-06-06
Organisations: Engineering Science Unit

Identifiers

Local EPrints ID: 369127
URI: https://eprints.soton.ac.uk/id/eprint/369127
PURE UUID: f7ae47a7-e687-4a51-ac0b-6c309fb40b41
ORCID for Mithila Achintha: ORCID iD orcid.org/0000-0002-1732-3514

Catalogue record

Date deposited: 25 Sep 2014 13:49
Last modified: 29 Oct 2019 01:41

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