PARAMETRIC STUDY OF THE STRESS DISTRIBUTION IN A CRACKED HARD COATING UNDER LOAD WITH FRICTION

NICOLÁS FOCHESATTO; FERNANDO S. BUEZAS; WALTER TUCKART; MARTA B. ROSALES

Tandil

Congreso; MACI 2015-V Congreso de Matematica Aplicada, Computacional e Industrial; 2015

ASAMACI

Chromium coatings are frequently employed to improve the surface hardness, among other properties (e.g. in hot and cold rolling mill rolls). The presence of residual stresses is a well-knownphenomenon in these coatings. Decomposition and change of crystalline microstructure of the chromium hydrides generate a change in volume, and the appearance of a stress state. When the limit mechanical strength is reached, microcracks arise in the volume of the coating. The physical complexity of the contact phenomenon involves magnitudes not easily measured during a test, such as time of contact and interaction forces. Thus, a computational model appears convenient. The contact model is approximated using the equations of Finite Elasticity discretized by the finite element method (FEM). The contact condition was modeled by a penalty function. A parametric study involving geometric properties carried out with two finite element environments is reported.