University of Illinois Urbana-Champaign

Effect of interface slip and diffusion on creep strength of fiber and particulate composite materials

Prasad, N.B.R.; Sofronis, Petros

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https://hdl.handle.net/2142/112496

Description

Title
Effect of interface slip and diffusion on creep strength of fiber and particulate composite materials
Author(s)
  • Prasad, N.B.R.
  • Sofronis, Petros
Issue Date
1995-07
Keyword(s)
  • Interface Slip
  • Diffusion
  • Creep Strength
  • Composite Materials
Abstract
It is well known that the creep resistance of metal and intermetallic matrix composites containing fibers or particulates arises from the constraint of the matrix by the reinforcement. Experimental results indicate that, in general, at modest temperatures the creep strength of these composites is better than that of the matrix material alone. However, at temperatures higher than approximately half of the melting temperature of the matrix the composite strength is limited and in some cases the strengthening imparted by the reinforcements is completely lost. The quantitative effect of diffusional relaxation and interface slip along the matrix-reinforcement interface, on the matrix constraint and thereby on the creep resistance, is studied. The composite behavior is modeled by coupling the slip and diffusional mass transport along the interface with power law deformation of the matrix with the reinforcement considered as rigid. The transverse creep resistance of a continuous fiber composite material and the axial creep strength of a discontinuous fiber composite are investigated in plane strain and axial symmetry respectively. The relevant unit cell boundary value problems are solved by the finite element method. Results indicate that slip at the interface alone can reduce the transverse creep strength of a continuous fiber composite to levels below that of the pure matrix material. On the contrary, analysis of the axial creep resistance of discontinuous fiber composites indicates that diffusion is necessary in addition to the free slip for the same result.
Publisher
Department of Theoretical and Applied Mechanics. College of Engineering. University of Illinois at Urbana-Champaign
Series/Report Name or Number
  • TAM R 798
  • 1995-6020
ISSN
0073-5264
Type of Resource
text
Language
eng
Permalink
http://hdl.handle.net/2142/112496
Sponsor(s)/Grant Number(s)
National Science Foundation 95/07 MSS 92 10686 95/07
Copyright and License Information
Copyright 1995 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.