A methodology for the estimation of transverse failure strength of an oxidized lamina from isothermal aging studies

Jianyong Liang, Kishore V. Pochiraju

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Surface oxidation and ensuing damage substantially decrease the service life of High Temperature Polymer Matrix Composite (HTPMC) structures. Oxidative degradation behavior of composites is strongly dependent on the coupling between chemical and mechanical responses of the material. In a composite lamina, the onset of damage and subsequent coupled acceleration of both damage and oxidation are controlled by the transverse failure strength of the oxidized regions. The direct measurement of this strength from experimentation is challenging and cumbersome. A model-based methodology for estimating the mean transverse failure strength of the oxidized regions of a unidirectional composite is described in this paper. As the strength of the oxidized region is expected to show a high-degree of spatial variability, the estimated mean is shown to be relatively insensitive to the effect of strength variance. The developed methodology is illustrated with isothermal aging data available for a typical high-temperature composite system.

Original languageEnglish
Pages (from-to)101-108
Number of pages8
JournalComposites Part A: Applied Science and Manufacturing
Volume73
DOIs
StatePublished - Jun 2015

Keywords

  • B. Environmental degradation
  • B. Strength
  • C. Damage mechanics
  • Oxidation

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