Anisotropic Hardening of Sheet Metals at Elevated Temperature: Tension-Compressions Test Development and Validation
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New test equipment has been developed to measure the in-plane cyclic behavior of sheet metals at elevated temperatures. The tester has clamping dies with adjustable side force to prevent the sheet specimens from buckling during compressive loading. In addition to the room temperature experiment, cartridge type heaters are inserted in the clamping dies so that the specimen can be heated up to 400 °C during the cyclic tests. For the strain measurement, a non-contact type laser extensometer is used. In order to validate the newly developed test device, the tension-compression (and compression-tension) tests under pre-strains and various temperatures have been performed. As model materials, the aluminum alloy sheet which exhibits a large Bauschinger effect and the magnesium alloy sheet which exhibits different amounts of asymmetry under cyclic loading are used. The developed device can be well-suited to measure the cyclic material behavior, especially the anisotropic and asymmetric hardening of light-weight materials.
KeywordsExperimental device Tension-compression test Bauschinger effect Asymmetric hardening Elevated temperature Magnesium alloys Aluminum alloys
H.Y. Kim appreciates the support by the Mg Material R&D Project for the Super-light Vehicle operating for the execution of WPM program funded by the Ministry of Knowledge Economy, Republic of Korea. M.G. Lee appreciates the partial support by the grants from the Industrial Source Technology Development Program (#10040078) of Ministry of Knowledge and Economy and from the Ministry of Education, Science and Technology (NRF-2012R1A5A1048294). J. H. Kim and D. Kim appreciate the support from the Fundamental Research Program of the Korea Institute of Materials Science (KIMS), South Korea. The previous works by Professor R.H. Wagoner at Ohio State University and Prof. Kuwabara became great motivations of the present experimental works.
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