Paper Title:
Determination of the Effective Film Mechanical Properties in the Impact Test Imprint of Coated Specimens
  Abstract

If the film of a coated component deforms plastically because of operational loads, residual stresses are developed in the coating material after the load removal. In this way, material mechanical properties changes occur due to endogenous reasons i.e. induced by the coating crystalline structure plastic deformation. In this case, the determination of the effective film mechanical properties has been introduced in a recent publication [1]. Moreover, if the loading conditions lead only to a substrate plastic deformation, the coating remains elastically deformed during the relaxation, due to the substrate residual stresses. Thus, the associated material mechanical properties changes are caused by exogenous parameters related to the permanent substrate deformation. In the present paper, a novel experimental-analytical method based on FEM calculations is introduced to determine the effective film mechanical properties when the coating is stressed elastically due to a plastic substrate deformation. The perpendicular impact test is a convenient experimental procedure to investigate such an effect because under appropriate loading conditions, the substrate deforms plastically and the coating elastically. The pristine constitutive law of the applied PVD film was determined by nanoindentation and FEM supported results evaluation. Impact tests were conducted at various loads and loading cycles. The impact test was simulated by a two dimensional FEM model. Additionally, the developed elastic residual stress fields in the coating and the plastic ones of the substrate in the imprint were determined. In these calculations, a rate-independent anisotropic plasticity with kinematic hardening material law was considered and the film as an anisotropic material with variable mechanical properties in three main directions. Finally, by a FEM supported simulation of the nanoindention, the coating’s load-displacement behaviour in various areas of the impact imprint were predicted and the effective coating mechanical properties as well.

  Info
Periodical
Edited by
M. Merklein, F.-W. Bach, K.-D. Bouzakis, B. Denkena, M. Geiger and H.-K. Toenshoff
Pages
131-138
DOI
10.4028/www.scientific.net/KEM.438.131
Citation
K. D. Bouzakis, G. Skordaris, E. Bouzakis, E. Lili, "Determination of the Effective Film Mechanical Properties in the Impact Test Imprint of Coated Specimens", Key Engineering Materials, Vol. 438, pp. 131-138, 2010
Online since
May 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Rainer Gadow, D. López, A. Candel
Abstract:Actual requirements in the automotive industry are the reduction of fuel consumption and pollution emission, engine efficiency improvement,...
1330
Authors: Bong Hwan Kim, Sang Mok Lee
Abstract:Al-Cu-Fe-B quasicrystalline and Mo coatings were obtained on the mild steel and brass substrates by thermal spraying routes for the purpose...
715
Authors: Cui Li, Wei Qi, Kutsuna Muneharu
Abstract:A zircon coating was applied on the surface of Ti-6Al-4V alloy by plasma spray and its effect on the high temperature tensile properties of...
547
Authors: Nurot Panich, Surasak Surinphong, D.A. Karpov, Yong Kwang Tan, Chin Foo Goh, Jan Ma
Abstract:The aim of this work is to fabricate and develop the innovative ceramic coatings for protection applications with both high hardness and...
81