University of Illinois Urbana-Champaign

Static and cyclic fatigue failure at high temperature in ceramics containing grain boundary viscous phase part ii modelling

Dey, Nishit; Socie, Darrell F.; Hsia, K. Jimmy

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https://hdl.handle.net/2142/112427

Description

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
Issue Date
1993-11
Keyword(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.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 737
  • 1993-6035
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112427
Sponsor(s)/Grant Number(s)
Energy Department 93/11
Copyright and License Information
Copyright 1993 Board of Trustees of the University of Illinois

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Technical Reports - Theoretical and Applied Mechanics (TAM) PRIMARY
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.