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Title:Static and cyclic fatigue failure at high temperature in ceramics containing grain boundary viscous phase part ii modelling
Author(s):Dey, Nishit; Socie, Darrell F.; Hsia, K. Jimmy
Subject(s):Static And Cyclic Loading
Fatigue Failure
High Temoerature
Grain Boundary Viscous Phase
Abstract:In Ceramic marterials, the crack surface behind the crack tip is extensively bridged by adhesive viscous ligaments at high homologous temperatures. The extent of crack tip shielding from the externally applied stress by these viscous ligaments depends on material parameters, loading condition and loading types. Here a mechanistic model has been developed based on grain size and the width and viscosity of the grain boundary viscous layer to predict the ratio of lifetime under static loading to cyclic loading with various types of loading waveforms. A single dimensionless scalar parameter, 'I', has been identified as a critical parameter to determine whether the cyclic loading will be equally damaging or less damaging than the corresponding static loading at high homologous temperature. Model predictions agree with experimental results of various authors.
Issue Date:1993-11
Publisher:Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report:TAM R 737
Genre:Technical Report
Sponsor:Energy Department 93/11
Rights Information:Copyright 1993 Board of Trustees of the University of Illinois
Date Available in IDEALS:2021-11-04

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  • Technical Reports - Theoretical and Applied Mechanics (TAM)
    TAM technical reports include manuscripts intended for publication, theses judged to have general interest, notes prepared for short courses, symposia compiled from outstanding undergraduate projects, and reports prepared for research-sponsoring agencies.

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