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Finite element simulation of laser shock peening process

SRINIVASAN, MADHAV
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204910079

Abstract Details

2008, MS, University of Cincinnati, Engineering : Mechanical Engineering.
Laser Shock Peening (LSP) is a relatively new material processing technology to enhance the operating service lives of engineering components. It has been applied to metal parts such as aircraft engine turbine blades, compressor blades and medical implants like human hip joints. In this process shock waves are generated in the material using a high powered laser beam which develops residual stresses in the material. It has been proved experimentally that the life cycle of laser shock peened components are higher than conventionally shot peened components. Although LSP process has been found to be effective, improper control of the process will lead to spallation in the material under certain conditions. The spallation within the material in the form of crack significantly reduces the operating life of the component. Currently there is no systematic modeling approach to predict the material response under LSP. As such, the objective of this thesis is to develop a comprehensive model for the predicting the material response as a result of the LSP process. More specifically a pressure model is first established to obtain the pressure loading based on laser pulse intensity. Using the pressure load as input the spallation response is simulated by developing a strain rate and temperature dependent material model. The material model is implemented along with a nucleation and growth based damage model. The material and dynamic fracture model is solved using a semi-implicit forward tangent modulus algorithm. A user defined subroutine (UDM) is written and combined with the analysis tool LS-DYNA. The new model is compared with reported experimental results and a parametric study is done to understand the influence of various processing parameters. The residual stress obtained from simulation is in good agreement with experimental results. The spallation results have not been verified due to lack of experimental data.
Dong Qian, Dr (Advisor)
80 p.
Mechanical Engineering
Laser Shock Peening; Residual stress

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Citations

  • SRINIVASAN, M. (2008). Finite element simulation of laser shock peening process [Master's thesis, University of Cincinnati]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204910079

    APA Style (7th edition)

  • SRINIVASAN, MADHAV. Finite element simulation of laser shock peening process. 2008. University of Cincinnati, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204910079.

    MLA Style (8th edition)

  • SRINIVASAN, MADHAV. "Finite element simulation of laser shock peening process." Master's thesis, University of Cincinnati, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1204910079

    Chicago Manual of Style (17th edition)

ucin1204910079
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© 2008, all rights reserved.
This open access ETD is published by University of Cincinnati and OhioLINK.