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This paper considers the experimental characterization of crack growth from unbridged defects in fiber-reinforced titanium metal matrix composites subjected to cyclic loading by the use of fracture mechanics parameters. The conditions under which parameters such as the nominal applied stress intensity range, ΔKapp, the nominal maximum stress intensity factor, Kmax, and the effective stress intensity range, ΔKeff, are of use, and their experimental measurement are considered. Effects of fiber fracture, stress intensity factor range, mean stress, loading configuration (bending versus tension), test temperature, crack size, crack shape, and fiber-matrix interfacial strength on fatigue crack growth resistance are highlighted. The experimental determination of crack arrest in such composites is outlined.
crack growth, defects (materials), titanium, titanium matrix composites, life prediction, titanium alloys, fatigue (materials), modeling
Professor of Mechanical Metallurgy, School of Metallurgy and Materials/IRC in Materials for High Performance Applications, The University of Birmingham, Edgbaston,