The authors have dealt with a problem that is quite common when nonconformal rough surfaces come into contact . They state “To our best knowledge, however, no attempt has been reported to solve the contact problem with positive overlap between two rough particles.” This discussion is aimed at highlighting that such work does exist and provide additional insight. Specifically, Ref.  deals with two contacting rough surfaces, one flat and the other hemispherical (similar to the case herein). But the work in Ref.  deals with real surfaces having the complication that both contain nonhomogeneous and anisotropic roughness properties. A procedure is given  where these properties had been reduced to parameters (spectral moments) that the GW model needs. It should be noted that what the authors call “GW, E-GW, and EP-GW” cases, are seamlessly handled in Ref.  without...
Discussion: “Extended Greenwood-Williamson Models for Rough Spheres” (Zhao, T., and Feng, Y. T., 2018, ASME J. Appl. Mech., 85(10), p. 101007)
Georgia Institute of Technology,
Atlanta, GA 30332
Manuscript received June 25, 2018; final manuscript received July 17, 2018; published online August 6, 2018. Assoc. Editor: Yashashree Kulkarni.
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Green, I. (August 6, 2018). "Discussion: “Extended Greenwood-Williamson Models for Rough Spheres” (Zhao, T., and Feng, Y. T., 2018, ASME J. Appl. Mech., 85(10), p. 101007)." ASME. J. Appl. Mech. November 2018; 85(11): 115501. https://doi.org/10.1115/1.4040950
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