ASTM STP 1392 Mechanical, Thermal and Environmental Testing and Performance of Ceramic Composites and Components
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Jenkins MG
This publication contains papers presented at the Symposium on Environmental, Mechanical, and Thermal Properties and Performance of Continuous Fiber Ceramic Composite (CFCC) Materials and Components held in Seattle, Washington on 18 May 1999. ASTM Committee C28 on Advanced Ceramics sponsored the symposium in cooperation with Committees E08 on Fatigue and Fracture and D30 on Advanced Composites.
This publication contains twenty-one peer-reviewed manuscripts on continuous fiber-reinforced advanced ceramic composites, related test methods (standards), materials characterization, and design applications. The papers in this publication provide current results of research and development programs on continuous fiber ceramic composites.
The papers are divided into four major categories:
- Room-Temperature Test Results/Methods
- Test Results/Methods Related to Design Implications
- Environmental Effects and Characterization
- Damage Accumulation and Material Development
The Room-Temperature Test Results/Methods section includes papers on results of a round-robin program that used several full-consensus standards, influence of various test parameters on the tensile, shear and flexural behavior, novel transthickness tensile strength method, and delamination "toughness" and its effects.
The section on Test Results/Methods Related to Design Implications includes papers on stress rupture, stress-relaxation and overstressing effects on testing and design, unload and reload tensile tests, fiber testing, fiber waviness, surface finish notch effects and notch sensitivity.
The papers in the Environmental Effects and Characterization section address the thermal diffusivity changes due to microstructural damage, oxidation behavior in aggressive environments, time dependent deformation, and the effects of interphase oxidation. In the section on Damage Accumulation and Material Development, papers address damage accumulation during mechanical loading, effect of loading mode, temperature and environmental degradation of a novel pre-commercial material, degradation under constant load, and process development of a novel material system.
Examples of topics addressed by papers in this collection include:
- matrices synthesized by chemical vapor infiltration (CVI)
- polymer impregnation and pyrolysis (PIP)
- melt infiltration (MI)
- viscous glass infiltration
- durability
- reliability
- high temperature
- stress-rupture
- overstressing testing
- tension test
- unload/reload
- thermal exposure
- hysteresis
- residual stress
- interfacial shear stress
- fiber/matrix interphase
- creep-rupture
- matrix cracking
- effect of fiber waviness on the tensile response
- surface roughness
- notch effect
- oxide/oxide ceramic matrix composites
- alumina-silica matrix (AS)
- transthickness tensile strength results
- flexure testing
The papers in this collection provide information to engineers and researchers developing and verifying appropriate test methods as well as generating design data and design experience for advanced materials is expensive and time consuming. High-temperature ceramic composites are more expensive to process than monolithic ceramics, not just because of the extra cost of constituent materials but also because of labor-intensive fabrication steps. Equipment for testing at elevated temperatures is highly specialized and expensive. Unique and novel test methods must be developed to take into account thermal stresses, stress gradients, measurement capabilities, gripping methods, environmental effects, statistical considerations, and limited material quantities.