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Design of Structure Corners restraining Tribological Failures: Part II - Analysis of Design Parameters and Examples
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  • Journal title : Tribology and Lubricants
  • Volume 31, Issue 4,  2015, pp.170-176
  • Publisher : The Korean Society of Tribologists and Lubrication Engineers
  • DOI : 10.9725/kstle.2015.31.4.170
 Title & Authors
Design of Structure Corners restraining Tribological Failures: Part II - Analysis of Design Parameters and Examples
Kim, Hyung-Kyu;
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 Abstract
As a continuation of Part I, which developed a design formula of the minimum corner radius (Rmin) for restraining tribological failures, Part II investigates design parameters such as material properties and contact force. As design examples, Al 7075-T651, SST 304 and HT-9 are chosen for the materials and 1, 10 and 100 kN are used for the forces. The results show that the difference in Rmin decreases as either the elastic modulus increases or the contact force decreases. Given the same material and force, the permissible Rmin decreases as the flat region increases and vice versa. Because the Rmin values obtained from the examples are very small, the dimensions of the corner radius normally designed in engineering structures are regarded acceptable. The von Mises stress evaluated for a typical example, which is far below the yield strength, confirms this interpretation. Nevertheless, the present work can provide a design criterion as well as a guideline for quality control in the manufacturing of, in particular, contact corners, which has not been attempted before to the best of the author’s knowledge. In addition, this paper considers the problem of a step that may be formed in the contact contour by using a similar approach. The result shows that no size of the step is permissible.
 Keywords
structure corner;corner radius;contact mechanics;contact length;step;machining tolerance;
 Language
Korean
 Cited by
 References
1.
Kim, H.-K., “Design of structure corners restraining tribological failures: Part I-Development of design formula”, J. Korean Soc. Tribol. Lubr. Eng., submitted, 2015. http://www.matweb.com, Accessed July 20, 2015.

2.
http://www.matweb.com, Accessed July 25, 2015.

3.
Kim, S. H., “Tensile properties of 12Cr-1MoW martensitic stainless steel”, KAERI Internal Report, 2004.

4.
Kim, H.-K., SHEARCONTAC, Registered Program No. 2001-01-12-7084, Korea, 2001.

5.
Ciavarella, M., Demelio G., “On non-symmetrical plane contacts”, Int. J. Mech. Sci., Vol. 41, pp. 1533-1550, 1999. crossref(new window)