Abstract
Changes in surface morphology have long been thought to be associated with crack propagation in metallic materials. We have studied areal surface texture changes around crack tips in an attempt to understand the correlations between surface texture changes and crack growth behavior. Detailed profiling of the fatigue sample surface was carried out at short fatigue intervals. An image processing algorithm was developed to calculate the surface texture changes. Quantitative analysis of the crack-tip plastic zone, crack-arrested sites near triple points, and large surface texture changes associated with crack release from arrested locations was carried out. The results indicate that surface texture imaging enables visualization of the development of plastic deformation around a crack tip. Quantitative analysis of the surface texture changes reveals the effects of local microstructures on the crack growth behavior.
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This work has been funded by Air Force Office of Scientific Research (AFOSR) Grant FA9550-14-1-0319.
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Kelton, R., Sola, J.F., Meletis, E.I. et al. Visualization and Quantitative Analysis of Crack-Tip Plastic Zone in Pure Nickel. JOM 70, 1175–1181 (2018). https://doi.org/10.1007/s11837-018-2865-5
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DOI: https://doi.org/10.1007/s11837-018-2865-5