Investigating the Failure Mode during Crack Propagation Using Image Analyses

Abstract:

The purpose of this paper is to investigate the fracture modes of the crack propagation of fourteen sandstone samples under Cracked Chevron Notch Brazilian Disc (CCNBD) test conditions through the use of image analysis and the high speed camera. The fracture mode is characterized by the displacement of 0.5mm glass beads placed on the sandstone surface relative to the approximate orientation of the fracture propagation. Using a Phantom v2011 High Speed Camera the fracture generation and propagation of the samples are recorded and processed for image analysis. ImageJ with Multi-Tracker and Manual Tracker, as well MATLAB® software were used to analyze the movement of particles during fracture propagation. It was found that the ImageJ software was able to track the movement of the particles and the output of the MATLAB® script was able to plot vector trajectories of the particles. For the analysis of samples tested under different orientations it was found that both shear mode and mixed-mode were evident in the fracture propagation.

• Periodical: Applied Mechanics and Materials (Volume 846)
• Pages: 366-371
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.846.366
• Online since: July 2016
• Authors: Jesinthan Ketheeswaran*, Somayeh Behraftar, Alexander Scheuermann
• Keywords: CCNBD, Fracture Mode, Fracture Toughness, Image Analysis

References

[1] Erarslan, N. (2011). Static and Cyclic Laboratory Testing of Brisbane Rocks. Doctor of Philosophy. St Lucia: University of Queensland.

[2] Lin Q, Fakhimi A, Haggerty M, Labuz J (2009) Initiation of Tensile and Mixed-Mode Fracture In Sandstone. Intl. Journal Of Rock Mechanics & Mining Sciences. 46. Pp. 489 – 497.

DOI: 10.1016/j.ijrmms.2008.10.008

[3] Hertzberg, Richard W. (1995) Deformation and Fracture Mechanics of Engineering Materials. Wiley 4th edition.

[4] Whittaker B.N., Singh R.N., Sun, G (1992). Rock fracture mechanics; principles, design and applications. Developments in Geotechnical Engineering, Elsevier Publishers, Netherlands.

[5] Hochgraf F. (2004). Ductile and Brittle Fracture. Available from: http: /nhml. com/ductile-brittle. cfm.

[6] Fowell RJ, Hudson JA, Xu C, Chen JF, Zhao X. (1995).

[7] Fowell RJ, Xu C (1994) The use of the cracked Brazilian disc geometry for rock fracture investigations. Int J Rock Mech Min Sci Geomech Abstr 31(6): 571-579.

DOI: 10.1016/0148-9062(94)90001-9

[8] Backer, T. (2004). Fracture toughness determination and micromechanics of rock under mode I and mode II loading. Doctor of Philosophy. Germany: University of Potsdam.

[9] Rao, Q., Sun, Z., Stephonsson, O., Chunlin, L. & Stillborg, B. (2003). Shear fracture (mode II) of brittle rock Int. J. Rock Mech. Min. Sci., 40, 355–375.

DOI: 10.1016/s1365-1609(03)00003-0

[10] Dai F, Wei MD, Xu NW, Ma Y (2014) Numerical Assessment of the Progressive Rock Fracture Mechanism of Cracked Chevron Notched Brazilian Disc Specimens. Rock Mech Rock Eng 48(2015): 463-479.

DOI: 10.1007/s00603-014-0587-8

[11] Solomon, C.J., Breckon, T.P. (2010). Fundamentals of Digital Image Processing: A Practical Approach with Examples in Matlab. Wiley-Blackwell.

DOI: 10.1002/9780470689776

[12] Rasband, W.S., ImageJ, U. S. National Institutes of Health, Bethesda, Maryland, USA, http: /imagej. nih. gov/ij/, 1997-(2014).

[13] Schneider, C.A., Rasband, W.S., Eliceiri, K.W. NIH Image to ImageJ: 25 years of image analysis,. Nature Methods 9, 671-675, (2012).

DOI: 10.1038/nmeth.2089

[14] Abramoff, M.D., Magalhaes, P.J., Ram, S.J. Image Processing with ImageJ,. Biophotonics International, volume 11, issue 7, pp.36-42, (2004).

[15] Multi Tracker plugin created by Jeffrey Kuhn (jkuhn at ccwf. cc. utexas. edu) The University of Texas at Austin.

[16] .

[16] Ghamgosar M, Erarslan N, Williams D. (2014) Multiple Factorial Analysis of Rock Fragmentation Under Various Cyclic Loading Conditions. ISRM 13th Intl Congress on Rock Mechanics. Inc Press.