Many natural minerals and manmade materials are aggregates of crystals or polycrystalline solids with a nonrandom distribution of grain orientations. Macroscopic behavior in such textured polycrystals depends on directions and is thus anisotropic. In this paper we develop experimental and theoretical procedures for investigating grain orientation evolution and its effect on the tensile stress-strain curve. The micro-tensile experiments were executed in a self-developed micro-forcing-heating device together with a micro-recorder-image analyzer system. In the experiments the 0.1 mm thin foil specimens of pure nickel and copper were gradually loaded toward final failure and the evolution of grain boundaries and slip bands inside grains was observed and recorded digitally via microscope and CCD camera throughout the whole time history. The texture image data were then used in a theoretical micro-macro transformation procedure to simulate the orientation evolutions and the stress-strain curves. The procedure was based on a double-slip model of polycrystal plasticity and on averaging of polycrystalline behavior over all grain orientations weighted by an orientation distribution function. The comparisons made between the simulated and experimental data of orientation evolutions and between the simulated curves and the macro-curves concurrently obtained in the experiments confirm the proposed procedures capable of simulating the considered micro-macro relations.
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July 2002
Technical Papers
Planar Double-Slip Model for Polycrystal Plasticity and Micro Tension Tests of Pure Nickel and Copper
Hong-Ki Hong,
Hong-Ki Hong
Department of Civil Engineering, Taiwan University, Taipei, Taiwan
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Chein-Shan Liu,
Chein-Shan Liu
Department of Mechanical and Marine Engineering, Taiwan Ocean University, Keelung, Taiwan
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Ya-Po Shiao,
Ya-Po Shiao
Science and Technology Information Center, National Science Council, Taipei, Taiwan
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Bing-Chang Shih
Bing-Chang Shih
Department of Civil Engineering, Taiwan University, Taipei, Taiwan
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Hong-Ki Hong
Department of Civil Engineering, Taiwan University, Taipei, Taiwan
Chein-Shan Liu
Department of Mechanical and Marine Engineering, Taiwan Ocean University, Keelung, Taiwan
Ya-Po Shiao
Science and Technology Information Center, National Science Council, Taipei, Taiwan
Bing-Chang Shih
Department of Civil Engineering, Taiwan University, Taipei, Taiwan
Contributed by the Materials Division for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received by the Materials Division September 3, 2001; revised manuscript received February 18, 2002. Guest Editors: Tariq A. Khraishi and Hussein M. Zbib.
J. Eng. Mater. Technol. Jul 2002, 124(3): 314-321 (8 pages)
Published Online: June 10, 2002
Article history
Received:
September 3, 2001
Revised:
February 18, 2002
Online:
June 10, 2002
Citation
Hong, H., Liu, C., Shiao, Y., and Shih, B. (June 10, 2002). "Planar Double-Slip Model for Polycrystal Plasticity and Micro Tension Tests of Pure Nickel and Copper ." ASME. J. Eng. Mater. Technol. July 2002; 124(3): 314–321. https://doi.org/10.1115/1.1479355
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