ANALISA PENGARUH BENTUK UJUNG INDENTER TERHADAP NILAI KEKERASAN PERMUKAAN PADA NANO-INDENTATION TEST MENGGUNAKAN METODE ELEMEN HINGGA

Abstract

Nano-indentation has provided valuable information on the mechanical property of materials in very small size in bulk or as thin films and coatings. Influence of contact geometry, including the round tip of the indenter and the roughness of the specimen, on hardness behavior for elastic perfectly plastic materials is studied by means of finite element simulation. Idealize the actual indenter by an equivalent rigid conic indenter fitted smoothly with a spherical tip and examine the interaction of this indenter with both a flat surface and a rough surface. In the latter case the rough surface is represented by either a single spherical asperity and a cavity. The indentation behavior of a heterogeneous material with constituents having distinctly different mechanical properties. The microstructural heterogeneity by an elastic perfectly plastic finite element model nano-layers. This analysis aimed to influence of contact geometry, is tip roundness and surface roughness of specimen can influence behavior of hardness at depth of indentation which is small, curvature effect of asperity and cavity on the surface of the test specimen can cause further changes in hardness values and response in these heterogeneous materials is much more complex the recovery process observed in single-phase metals, deformation effect is analyzed during load and unload. Result of it's showing value hardness between present model with model Li et al. show good result with difference at close quarters small. Result of it's indicating that value equivalent plastic strain versus indentation depth between present model with model Tang et al. the small difference.