Fatigue behavior matrix composites

Figure 29. Comparison of the fatigue behavior of 3D carbon-matrix (CFRC) and epoxy-matrix (CFRP) composites (53).

Fatigue Behavior of Continuous Fiber-Reinforced Ceramic Matrix Composites... 

Experimental studies of the influence of stress ratio on elevated temperature fatigue life have been conducted by Suresh71 for whisker-reinforced AI2O3 (see Chapter 7 by Suresh for a discussion of the fatigue behavior of whisker-reinforced ceramics). In this section, the influence of stress ratio on the fatigue life of continuous fiber-reinforced ceramic matrix composites is discussed. 

R E Swain III, The role of the fiber/matrix interphase in the static and fatigue behavior of polymeric composite laminates, Dissertation, Department of Engineering Science and Mechanics, Virginia Polytechnic Institute State University, February, 1992. 

P. Forio, J. Lamon, Fatigue behavior at high temperatures in air of a 2D SiC/Si-B-C composite with a self-healing multilayered matrix. Ceramic Transactions Vol. 128, American Ceramic Society, Westerville (OH), (2001), pp. 127-141. 

D. Rouby, P. Reynaud, Fatigue behavior related to interface modification during load cycling in ceramic-matrix fibre composites. Composites Science and Technology 4% 109-118 (1993). 

S. G. Steel, Monotonic and Fatigue Loading Behavior of an Oxide/Oxide Ceramic Matrix Composite, Masters Thesis, Air Force Institute of Technology, Wright Patterson Air Force Base, OH. (2000). 

Miyajima T, Sakai M, Fibre pullout and fracture energy of C-fibre/C-matrix composites, Bradt RC, Hasselman DPH, Munz D, Sakai M, Ya Shevchenko V, Fracture Mechanics of Ceramics 9, Composites, R-Curve Behavior and Fatigue, Japan Fine Ceramics Center, Proc 5th Int Symp, Nagoya, Jul 15-17 1991, Plenum, 83-95, 1992. 

Fatigue behavior of [0/90]s-composites with the identicai EP resin matrix and different fibers [3]... 

Ceramic Matrix Composites (CMCs) 11 in the broad category of technical ceramics [I]. Unlike monolithic ceramics where surface and sub-surface flaws are known to be clearly detrimental from a tensile and durability [2] point of view, the effect of defects in CMCs is not as clear. The range of porosity (key defect) foimd in oxide/oxide is 25% [3], melt infiltrated nonoxide CMCs is 2% [3], polymer infiltrations pyrolysis ntm-oxide CMCs is 5% [3] and chemical vapor infiltrated non-oxide CMCs is 12% [4]. The properties vary widely between and wifliin these overall CMC classes. The above percent porosity for these classes of CMCs covers the conventional expectations from fabrication and does not consider local variations or unexpected processing concerns. Within all these systems, there is a range of durability behavior seen (both fatigue and creep). 

This long-standing symposium received presentations on a wide variety of topics thus providing the opportunity for researchers in different areas of related fields to interact. This volume emphasizes some practical aspects of real-world engineering applications of materials such as oxidation, fatigue, wear, nondestructive evaluation, and mechanical behavior as associated with systems ranging from niobium carbide to metallic-ceramic sandwich structures to ceramic matrix composites. Symposium topics included ... 

Ceramic-matrix fiber composites, 26 775 Ceramics mechanical properties, 5 613-638 cyclic fatigue, 5 633-634 elastic behavior, 5 613-615 fracture analysis, 5 634-635 fracture toughness, 5 619-623 hardness, 5 626-628 impact and erosion, 5 630 plasticity, 5 623-626 strength, 5 615-619 subcritical crack growth, 5 628—630 thermal stress and thermal shock, 5 632-633... 

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