کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
774320 1463218 2011 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Contact mechanics of microscopically rough surfaces with graded elasticity
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Contact mechanics of microscopically rough surfaces with graded elasticity
چکیده انگلیسی

The well-known Greenwood and Williamson contact theory for microscopically homogeneous rough surfaces is generalized by considering functionally graded elastic rough surfaces. In particular, two distinct cases giving rise to a non-constant Young’s modulus with depth are considered: (I) an initially plane layered (or graded) solid which is non-uniformly eroded, so that the final product is a rough surface with asperities having an elastic modulus depending on the height; (II) an initially homogeneous rough surface which receives a surface treatment or a chemical degradation which modify the elastic properties of the asperities as a function of the depth from the exposed surface. These Functionally Graded Surfaces (FGS) can be observed both in biological systems and in mechanical components. The effects of graded elasticity on the relationship between real contact area versus applied load, and on the plasticity index are quantified and illustrated with numerical examples. It will be shown that the contact response may differ up to one order of magnitude with respect to that of a homogeneous surface. Comparison between Case I and Case II also shows that, for special surface properties, the two types of grading can provide the same mechanical response.


► Generalization of the Greenwood and Williamson contact theory to functionally graded surfaces (FGS).
► Characterization of FGS resulting from the nonuniform erosion of a layered solid.
► Characterization of FGS resulting from a surface treatment of an initially homogeneous rough surface.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Journal of Mechanics - A/Solids - Volume 30, Issue 5, September–October 2011, Pages 696–704
نویسندگان
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