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Eigenstrain modelling of residual stress generated by arrays of Laser Shock Peeing shots and determination of the complete stress field using limited strain measurements

Eigenstrain modelling of residual stress generated by arrays of Laser Shock Peeing shots and determination of the complete stress field using limited strain measurements
Eigenstrain modelling of residual stress generated by arrays of Laser Shock Peeing shots and determination of the complete stress field using limited strain measurements
This paper presents a hybrid explicit finite element (FE) /eigenstrain model for predicting the residual stress generated by arrays of adjacent/overlapping laser shock peening (LSP) shots where the use of a completely explicit FE analysis may be impractical. It shows that for a given material, the underlying eigenstrain distribution (in contrast to the resulting stress field) representing a laser shock peen is primarily dependent on the parameters of the laser pulse and the number of overlays rather than the precise component geometry. Consequently the residual stress introduced by complex laser peening treatments can be built up by using static FE models and superposition of individual eigenstrain distributions without recourse to further computationally demanding explicit FE analyses. It is found that beneath a small patch of LSP array the magnitude of the compressive residual stress is higher than for a wider array of LSP shots and that with increasing numbers of layers the compressive stress increases as does the depth of the compressive zone. The model predictions for the eigenstrain distributions are compared well with experimental measurements of plastic strain (full-width-at-half-maximum) obtained by neutron diffraction. The eigenstrain method is also extended to construct the full residual stress field using measured residual elastic strains at a finite number of measurement locations in a component.
0257-8972
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Nowell, D.
587adb58-8b15-4efc-bc16-4071a35747f6
Shapiro, K.
e0cdc71a-0c27-4c2d-88b3-3005f468a982
Withers, P.J.
95b52224-f306-43a5-b75f-a2828b339f77
Achintha, M.
8163c322-de6d-4791-bc31-ba054cc0e07d
Nowell, D.
587adb58-8b15-4efc-bc16-4071a35747f6
Shapiro, K.
e0cdc71a-0c27-4c2d-88b3-3005f468a982
Withers, P.J.
95b52224-f306-43a5-b75f-a2828b339f77

Achintha, M., Nowell, D., Shapiro, K. and Withers, P.J. (2012) Eigenstrain modelling of residual stress generated by arrays of Laser Shock Peeing shots and determination of the complete stress field using limited strain measurements. Surface and Coatings Technology. (doi:10.1016/j.surfcoat.2012.11.027).

Record type: Article

Abstract

This paper presents a hybrid explicit finite element (FE) /eigenstrain model for predicting the residual stress generated by arrays of adjacent/overlapping laser shock peening (LSP) shots where the use of a completely explicit FE analysis may be impractical. It shows that for a given material, the underlying eigenstrain distribution (in contrast to the resulting stress field) representing a laser shock peen is primarily dependent on the parameters of the laser pulse and the number of overlays rather than the precise component geometry. Consequently the residual stress introduced by complex laser peening treatments can be built up by using static FE models and superposition of individual eigenstrain distributions without recourse to further computationally demanding explicit FE analyses. It is found that beneath a small patch of LSP array the magnitude of the compressive residual stress is higher than for a wider array of LSP shots and that with increasing numbers of layers the compressive stress increases as does the depth of the compressive zone. The model predictions for the eigenstrain distributions are compared well with experimental measurements of plastic strain (full-width-at-half-maximum) obtained by neutron diffraction. The eigenstrain method is also extended to construct the full residual stress field using measured residual elastic strains at a finite number of measurement locations in a component.

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More information

Published date: 16 November 2012
Additional Information: Funded by EPSRC: Structural Integrity of Components with Deep Compressive Residual Stresses (EP/F026226/1, EP/F026730/1)
Organisations: Infrastructure Group

Identifiers

Local EPrints ID: 345424
URI: https://eprints.soton.ac.uk/id/eprint/345424
ISSN: 0257-8972
PURE UUID: 4156b55c-5708-4662-a439-1c513d73e3b7

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Date deposited: 20 Nov 2012 15:53
Last modified: 08 Dec 2017 17:31

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Contributors

Author: M. Achintha
Author: D. Nowell
Author: K. Shapiro
Author: P.J. Withers

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