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Title: Modeling the effect of laser heating on the strength and failure of 7075-T6 aluminum

Abstract

The effect of rapid laser heating on the response of 7075-T6 aluminum has been characterized using 3-D digital image correlation and a series of thermocouples. The experimental results indicate that as the samples are held under a constant load, the heating from the laser profile causes non-uniform temperature and strain fields, and the strain-rate increases dramatically as the sample nears failure. Simulations have been conducted using the LLNL multi-physics code ALE3D, and compared to the experiments. The strength and failure of the material was modeled using the Johnson–Cook strength and damage models. Here, in order to capture the response, a dual-condition criterion was utilized which calibrated one set of parameters to low temperature quasi-static strain rate data, while the other parameter set is calibrated to high temperature high strain rate data. The thermal effects were captured using temperature dependent thermal constants and invoking thermal transport with conduction, convection, and thermal radiation.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [1]
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1234573
Alternate Identifier(s):
OSTI ID: 1250142
Report Number(s):
LLNL-JRNL-668921
Journal ID: ISSN 0921-5093
Grant/Contract Number:  
AC52-07NA27344; 12-ERD-050
Resource Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 640; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 42 ENGINEERING; Strength; Modeling; Strain-rate; Laser

Citation Formats

Florando, J. N., Margraf, J. D., Reus, J. F., Anderson, A. T., McCallen, R. C., LeBlanc, M. M., Stanley, J. R., Rubenchik, A. M., Wu, S. S., and Lowdermilk, W. H. Modeling the effect of laser heating on the strength and failure of 7075-T6 aluminum. United States: N. p., 2015. Web. doi:10.1016/j.msea.2015.05.105.
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Florando, J. N., Margraf, J. D., Reus, J. F., Anderson, A. T., McCallen, R. C., LeBlanc, M. M., Stanley, J. R., Rubenchik, A. M., Wu, S. S., & Lowdermilk, W. H. Modeling the effect of laser heating on the strength and failure of 7075-T6 aluminum. United States. https://doi.org/10.1016/j.msea.2015.05.105
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Florando, J. N., Margraf, J. D., Reus, J. F., Anderson, A. T., McCallen, R. C., LeBlanc, M. M., Stanley, J. R., Rubenchik, A. M., Wu, S. S., and Lowdermilk, W. H. Sat . "Modeling the effect of laser heating on the strength and failure of 7075-T6 aluminum". United States. https://doi.org/10.1016/j.msea.2015.05.105. https://www.osti.gov/servlets/purl/1234573.
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@article{osti_1234573,
title = {Modeling the effect of laser heating on the strength and failure of 7075-T6 aluminum},
author = {Florando, J. N. and Margraf, J. D. and Reus, J. F. and Anderson, A. T. and McCallen, R. C. and LeBlanc, M. M. and Stanley, J. R. and Rubenchik, A. M. and Wu, S. S. and Lowdermilk, W. H.},
abstractNote = {The effect of rapid laser heating on the response of 7075-T6 aluminum has been characterized using 3-D digital image correlation and a series of thermocouples. The experimental results indicate that as the samples are held under a constant load, the heating from the laser profile causes non-uniform temperature and strain fields, and the strain-rate increases dramatically as the sample nears failure. Simulations have been conducted using the LLNL multi-physics code ALE3D, and compared to the experiments. The strength and failure of the material was modeled using the Johnson–Cook strength and damage models. Here, in order to capture the response, a dual-condition criterion was utilized which calibrated one set of parameters to low temperature quasi-static strain rate data, while the other parameter set is calibrated to high temperature high strain rate data. The thermal effects were captured using temperature dependent thermal constants and invoking thermal transport with conduction, convection, and thermal radiation.},
doi = {10.1016/j.msea.2015.05.105},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = ,
volume = 640,
place = {United States},
year = {Sat Jun 06 00:00:00 EDT 2015},
month = {Sat Jun 06 00:00:00 EDT 2015}
}
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https://doi.org/10.1016/j.msea.2015.05.105
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    Electrochemical assessment of laser heat treatment of an Al–Zn–Mg–Cu alloy
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    Microstructure and mechanical properties of 7075 alloy during laser heat treatment
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    Mechanical behavior and fracture characteristics of simultaneously tensile loaded and laser heated Ti6Al4V alloy
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