Contact Fatigue in Ceramic Laminated Composites

Abstract

In this work, the study of the contact fatigue of an alumina-based laminated composite with compressive residual stress in the surface is presented, together with monolithic alumina as a reference material. Hertzian indentation techniques were employed, which better represent the inservice actual contact loading. Different tests were performed under static and cyclic loading. The evolution of damage and the different types of fracture produced were examined, and an improvement in contact resistance of the composite, due to compressive residual stress, was highlighted. A better resistance of the laminated composite was observed for every test in comparison with the monolithic reference material.

Residual Stresses in Al₂O₃-ZrO₂ Laminar System

“…( 10) and the σ B -x dependence for x=t B /t A =2.74 in Fig. 2, the residual stress in the Al 2 O 3 layer is σ A = -390 MPa , which is significantly higher as the measured one but is a good agreement with the result of the FE calculation, [19] .…”

Instrumented indentation on alumina–alumina/zirconia multilayered composites with residual stresses

“…These ceramic multilayers have shown improved fracture toughness [9], reliability [10], wear behaviour [11] and contact resistance [12,13] than their monolithic counterparts, due, principally, to their residual stress. Correct assessment of this residual stress is, therefore, a key factor in these materials.…”