Fractographic investigations

Except for perfect crystals, the fracture surfaces in solids are never very smooth. In fact, it seems now to be established experimentally that for weakly disordered solids, the surfaces formed during fracture processes are very rough, and on a mesoscopic scale (which is much larger than the atomic scale but smaller than the macroscopic sample size) they are observed to have self-affine properties (Mandelbrot et al 1984, Bouchaud et al 1993 a,b, Roux 1994). These have recently been observed using various fractographic investigations. By self-affinity of the fracture surface, we mean that the surface coordinate in the direction perpendicular to the crack or fracture x — y) plane has the scaling property such that... 

Spitzig, W. A., and Wei, R. P., A Fractographic Investigation of the Effect of Environment on Fatigue-Crack Propagation in an Ultrahigh-Strength Steel, Trans. ASM, 60 (1967), 279. 

Part 6 Guidance for Fractographic Investigation, European Committee for Standardization. 

Following creep testing, samples were prepared for examination by transmission electron microscopy (TEM). Fractographic details were investigated using either light microscopy or scanning electron microscopy. 

Harmuth H, Bradt RC. Investigation of refractories brittleness by fracture mechanical and Fractographic methods. Interceram Ref Refractories Man. 2010. 

The aim of this paper is to study the strength characteristics of WC-Co composites in connection with thermoanalytic-al investigation and raetallographic-fractographic examination, to compeire the possibilities of three and four-point bend tests in hardmetal research and to study the subcritical crack growth parameters of these materials. 

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