Abstract
Contact fracturing of rock-like brittle materials indented by rigid cylindrical punches with flat ends is studied. Contrary to the classical shear fracturing mechanism of brittle materials explained in terms of multi-tensile-stressed micro-cracks in materials [1], a new mechanism dominant in brittle shear fracturing is found, namely, shear stress triggered fracturing orientation existing in nature, and the contact crack initiation angle for such kind rock-like materials is also revealed. This phenomenon is very different from such as Hertzian or Roesler’s [2] crack generation mechanism, as cracks are directed inwards rather than outwards. The theoretical predictions are validated by our experimental results. This finding testifies that for a rock-like brittle material shear fracturing along its maximum shear stress plane is possible under some special confinement, which has important implications for seismology and rock-mass stability, as well as rock engineering.
Original language | English |
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Pages (from-to) | 295-302 |
Number of pages | 8 |
Journal | International Journal of Mechanical Sciences |
Volume | 146-147 |
Early online date | 27 Jul 2018 |
DOIs | |
Publication status | Published - 1 Oct 2018 |
Bibliographical note
L. Ma would like to thank the partial support by National Natural Science Foundation of China (Grant No.: 41630634).Keywords
- brittle shear fracturing
- rock-like materials
- contact mechanics
- conical crack
- J-integral
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Marian Wiercigroch
- Engineering, Engineering - Sixth Century Chair in Applied Dynamics
- Engineering, Centre for Applied Dynamics Research (CADR)
Person: Academic