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Material model validation for laser shock peening process simulation

Material model validation for laser shock peening process simulation Advanced mechanical surface enhancement techniques have been used successfully to increase the fatigue life of metallic components. These techniques impart deep compressive residual stresses into the component to counter potentially damage-inducing tensile stresses generated under service loading. Laser shock peening (LSP) is an advanced mechanical surface enhancement technique used predominantly in the aircraft industry. To reduce costs and make the technique available on a large-scale basis for industrial applications, simulation of the LSP process is required. Accurate simulation of the LSP process is a challenging task, because the process has many parameters such as laser spot size, pressure profile and material model that must be precisely determined. This work focuses on investigating the appropriate material model that could be used in simulation and design. In the LSP process material is subjected to strain rates of 106s1, which is very high compared with conventional strain rates. The importance of an accurate material model increases because the material behaves significantly different at such high strain rates. This work investigates the effect of multiple nonlinear material models for representing the elasticplastic behavior of materials. Elastic perfectly plastic, JohnsonCook and ZerilliArmstrong models are used, and the performance of each model is compared with available experimental results. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Modelling and Simulation in Materials Science and Engineering IOP Publishing

Material model validation for laser shock peening process simulation

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Copyright
Copyright 2009 IOP Publishing Ltd
ISSN
0965-0393
eISSN
1361-651X
DOI
10.1088/0965-0393/17/1/015010
Publisher site
See Article on Publisher Site

Abstract

Advanced mechanical surface enhancement techniques have been used successfully to increase the fatigue life of metallic components. These techniques impart deep compressive residual stresses into the component to counter potentially damage-inducing tensile stresses generated under service loading. Laser shock peening (LSP) is an advanced mechanical surface enhancement technique used predominantly in the aircraft industry. To reduce costs and make the technique available on a large-scale basis for industrial applications, simulation of the LSP process is required. Accurate simulation of the LSP process is a challenging task, because the process has many parameters such as laser spot size, pressure profile and material model that must be precisely determined. This work focuses on investigating the appropriate material model that could be used in simulation and design. In the LSP process material is subjected to strain rates of 106s1, which is very high compared with conventional strain rates. The importance of an accurate material model increases because the material behaves significantly different at such high strain rates. This work investigates the effect of multiple nonlinear material models for representing the elasticplastic behavior of materials. Elastic perfectly plastic, JohnsonCook and ZerilliArmstrong models are used, and the performance of each model is compared with available experimental results.

Journal

Modelling and Simulation in Materials Science and EngineeringIOP Publishing

Published: Jan 1, 2009

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