LOAD CARRYING CAPACITY OF Ni PLATED MEDIA IN SPHERICAL INDENTATION: EXPERIMENTAL AND THEORETICAL RESULTS

Abstract

Spherical indentation ex periments have been performed materials. It was also found that with a stiV layer on a more compliant base material, an intermediate layer on aluminium and steel specimens. Some of the specimens were layered with electroplated nickel and that was too thin would decrease the load carrying capacity as compared with the homogeneous base all were surface coated with thin vapour deposited WC/C. T he ex perimental results were compared with material case. Finally, although not including plastic deformation, the analytical elastic calculations proved simulations made with the commercially available Elastica software package. T he aim of the study was to be valuable for the interpretation of the ex perimental results. SE/426 to investigate how an intermediate load carrying layer between a soft and compliant base material and a thin brittle coating can improve the resistance to plastic thickness and suitable mechanical properties improves the load carrying capacity of soft and compliant base

Evaluation of the load-carrying capacity of hard coatings deposited onto a 7075-T6 aluminium alloy

“…En general, las aleaciones de bajo peso son blandas y si se les aplican altas cargas que generen tensiones elevadas, se puede inducir su deformación plástica. Esto significa que la capacidad de soporte de carga de los sistemas constituidos por substratos de baja dureza recubiertos con películas duras es muy limitada para aplicaciones que involucran tensiones elevadas, comportamiento que ha sido estudiado previamente por varios autores [3][4][5][6][7] .…”

“…Por otra parte, la superficie del recubrimiento (Fig. 2 b)), pone de manifiesto la existencia de una estructura de nódulos comúnmente llamada "estructura de coliflor", de la cual han informado otros autores [5] .…”

“…T Ta ab bl la a I I. Propiedades mecánicas de los materiales utilizados en los cálculos Aleación 7075-T6 72 [4] 0,35 [4] 0,55 [4] Recubrimiento de NiP 160* 0,30 [5] 1,67 * Recubrimiento de ZrN 460 [14] 0,19 [14] 21 * Bola de WC-Co (radio = 3 mm) 475 [19] 0,22 [19] -* Determinado experimentalmente. mediante el procedimiento de Eskner y Sandström [13] .…”

Correlation of nanoindentation-induced deformation microstructures in diamondlike carbon coatings on silicon substrates with simulation studies

“…For example, Palacio et al 32 have used it to assess the load carrying ability of CN x coatings on different substrates and Walter et al 33 to determine the Young's modulus of the CrN thin films from the simulated load-displacement curves. Other studies [34][35][36][37] have used ELASTICA to characterize the von Mises effective stress profiles in the coated systems to determine the critical load for the initiation of the plastic deformation in the respective coating and substrates. On the basis of these theoretical calculations and experimental data, Wanstrand et al 34 proposed a surface design for a low weight machine.…”

The extended Hertzian theory and its uses in analyzing indentation experiments

“…The method we apply here is the so called method of image loads or image contacts [13]. Apart from other uses this method allowed for example the determination of the Young's modulus of very thin coatings down to 4.3 nm [14], the optimisation of the load carrying capacity of thin film structures [15,16], or the successful characterisation of functionally graded coatings by using differently sized spherical indenters [17,18].…”