Subcritical crack growth mechanisms in ceramic matrix composites: experimental observations and modelling. (29th October 2004)

• Record Type: Journal Article
• Authors: Lewinsohn, Charles A.; Henager Jr, Charles H; Windisch, Charles F.; Simonen, Edward P.; Jones, Russell; Hoagland, Richard; Kohyama, Akira
• Is Part Of: International journal of material & product technology. Volume 16:Number 1/3(2001)
• Page Start: 132
• Page End: 138
• Publication Date: 2004-10-29
• Subjects: silicon carbide -- ceramic matrix composites -- CMC -- crack growth -- mechanical properties -- oxidation -- failure mechanisms -- fibre reinforcement -- interphases -- microstructure; Manufacturing processes -- Periodicals; Materials -- Testing -- Periodicals; 620.11
• Languages: English
• ISSNs: 0268-1900

Abstract

Various experimental techniques were used to identify failure mechanisms that occur under occur in continuous fibre-reinforced ceramic matrix composites containing interphases that are susceptible to oxidation. The conditions under which these mechanisms occur were dictated by environmental conditions and microstructural parameters, such as temperature, oxygen concentration, and interphase thickness. Details of the mechanical state of fibres that bridge matrix cracks, during the operation of each mechanism, were developed to allow the application of models that can predict time-dependent, subcritical crack growth. This paper will present evidence of environmentally induced crack growth and discuss a model for predicting the rate of time-dependent, subcritical crack growth.