Topic
Fractography
About: Fractography is a research topic. Over the lifetime, 5043 publications have been published within this topic receiving 86068 citations.
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TL;DR: In this article, the effect of stress-state triaxiality on damage accumulation leading to fracture at ambient temperature in magnesium alloy AZ31 has been investigated and it is shown that the strain to failure is weakly sensitive to triaxionality for the conditions investigated, at variance with the behavior of most alloy systems.
Abstract: We report on the effect of stress-state triaxiality on damage accumulation leading to fracture at ambient temperature in magnesium alloy AZ31. We find that the strain to failure is weakly sensitive to triaxiality for the conditions investigated, at variance with the behavior of most alloy systems. Using plastic anisotropy measurements, post-mortem fractography and transverse cross-sectioning of specimens at incipient cracking, we discuss the contributions of plastic anisotropy, shear failure and coalescence-controlled cracking to limiting the net effect of stress triaxiality.
32 citations
TL;DR: In this paper, the compressive deformation and fracture behaviors of a Zr47Cu46Al7 bulk metallic glass (BMG) and its composites with different microstructures were investigated.
Abstract: The compressive deformation and fracture behaviors of a Zr47Cu46Al7 bulk metallic glass (BMG) and its composites with different microstructures were investigated. For the fully amorphous alloy, due to the formation of coarse primary shear bands and multiple secondary shear bands, it exhibited a high plasticity up to 14.5% with a 'work softening' during compressive test. With the increase in the volume fraction of primary crystallizing phases, the BMG composites displayed low strength and poor plasticity even failing in a brittle mode. Furthermore, the effects of microstructures on the compressive deformation and fracture behaviors of the BMG composites were discussed. (c) 2007 Published by Elsevier B.V.
32 citations
01 Jan 2016
TL;DR: Fractography observing measuring and interpreting fracture surface topography as discussed by the authors is a good example of a book that can be downloaded and used to study the fractal surface topology of a building.
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32 citations
01 Apr 2003
TL;DR: In this paper, the fractography and cutting surface formation are studied in laser cutting using the controlled fracture technique is based on the thermal breaking principle; the laser beam is applied to the surface of a ceramic substrate; the substrate is then controllably separated along the moving path of the laserbeam.
Abstract: Laser cutting using the controlled fracture technique is based on the thermal breaking principle. The laser beam is applied to the surface of a ceramic substrate; the substrate is then controllably separated along the moving path of the laser beam. The fractography and cutting surface formation are studied in this work. It is found that the breaking surface can be divided into four regions. The first region is the laser evaporation region produced by the heat concentration. The second region is the columnar grain region produced by resolidification of the melted material. The third region is the intergranular fracture region produced by anisotropic thermal expansion. The fourth region is the transgranular fracture region characterized by unstable fractures. These experiments are conducted on alumina ceramics using a CO2 laser. The fracture mechanism is analysed using stress analysis and fractographic observation. The tensile stress generated on the surface due to the laser beam separates the mater...
32 citations
TL;DR: In this article, the effects of microscale phenomena on macroscale crack growth were studied to develop an in-depth understanding of crack nucleation and growth, and detailed fractography analysis was conducted to understand the crack growth behaviour observed during the fatigue tests.
Abstract: Fatigue damage characteristics of aluminium alloy under complex biaxial loads such as in-phase and out-of-phase loading conditions and different biaxiality ratios have been investigated. The effects of microscale phenomena on macroscale crack growth were studied to develop an in-depth understanding of crack nucleation and growth. Material characterization was conducted to study the microstructure variability. Scanning electron microscopy was used to identify the second phase particles, and energy dispersive X-ray spectroscopy was performed to analyse their phases and elements. Extensive quasi-static and fatigue tests were conducted on Al7075-T651 cruciform specimens over a wide range of load ratios and phases. Detailed fractography analysis was conducted to understand the crack growth behaviour observed during the fatigue tests. Significant differences in crack initiation and propagation behaviour were observed when a phase difference was applied. Primarily, crack retardation and splitting were observed because of the constantly varying mode mixity caused by phase difference. The crack growth behaviour and fatigue lives under out-of-phase loading were compared with those under in-phase loading to understand the effect of mixed-mode fracture.
32 citations