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Free surface roughening under simple tension

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Abstract

The effect of process parameters on surface roughening under simple tension in a tensile test is investigated. The assumption that the surface roughness is caused by the difference between the axial tensions of the top and bottom of the asperities in the thickness direction on the surface layer is used to model the free surface roughening. An equation is derived for the relationship between surface roughness and process parameters such as the initial roughness, effective strain, strain hardening exponent, and normal anisotropic value. In a tensile test, free surface roughness decreases nonlinearly as the normal anisotropic value and strain hardening exponent increase; it increases linearly with effective strain or grain size. Experimental results support the proposed model, which improves our understanding of the mechanism of the free surface roughening of sheet metals under tension.

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Acknowledgments

The author would like to thank the Ministry of Science and Technology of the Republic of China, Taiwan, for financially supporting this research under Contract No. MOST 105-2221-E-149-002. The assistance of B.-Y. Chen and Y.-Y. Zhan with the experiment is appreciated.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Taipei City University of Science and Technology, No.2, Xueyuan Road, Beitou, Taipei, 112, Taiwan, Republic of China

    Daw-Kwei Leu

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  1. Daw-Kwei Leu
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Correspondence to Daw-Kwei Leu.

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Leu, DK. Free surface roughening under simple tension. Int J Adv Manuf Technol 95, 2349–2356 (2018). https://doi.org/10.1007/s00170-017-1418-3

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  • DOI: https://doi.org/10.1007/s00170-017-1418-3

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