applied fracture mechanics

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Fracture Analysis of Generator Fan Blades 315is shown in Fig. 4. Presence of several second phase particles on the surface is obvious. Thiskind of large particles can accelerate the fatigue crack initiation and affect the fatiguebehaviour of the blade material.Figure 3. Fatigue test S-N curveFigure 4. Fracture surface of a fatigue test specimen
316Applied Fracture Mechanics3.2.5. MicrostructureTypical microstructures of the blade material in the longitudinal and transverse sections of acracked airfoil are shown in Fig. 5. The microstructure consists of elongated grains andsecond phase particles in the longitudinal direction. Various types of second phase particlescan be identified in the SEM micrograph, shown in Fig. 6. The large and elongated particleon the micrograph was subjected to EDS analysis. The composition of the particle containediron, copper and aluminum which is consistent with the β-phase (Al7Cu2Fe) particlescommon to aluminum alloys (Merati, 2005).Figure 5. Microstructures of longitudinal (a) and transverse (b) sections of a cracked bladeFigure 6. SEM micrograph showing large second phase particles3.3. FractographyThe fracture location of the broken blades can be identified from Fig. 2. It can be seen thatthe fracture had occurred close to the transition radius between the blade airfoil and theblade root. All the fracture surfaces exhibited very similar macroscopic features. A
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PrefaceKnowledge accumulated in the
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Section 1Computational Methods of F
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Chapter 4Fracture of Dental Materia
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Fracture Mechanics Based Models of
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