Abstract
This paper presents an experimental investigation on both monotonic strength and fatigue crack kinetics for Berea sandstone. It is found that for all specimens the Paris-Erdogan law is applicable for a wide range of the amplitudes of the stress intensity factor. The fatigue tests also indicate that there is a small-crack growth regime at the beginning stage, where the growth rate decreases as the crack propagates. The fracture kinetics for both the small-crack growth and the Paris regimes is subjected to a strong size effect. During the strength and fatigue tests, the damage process is examined by the digital image correlation method, and it is shown that the length of the fracture process zone under cyclic loading is about 60% larger than that under monotonic loading. In parallel with the experiments, a theoretical model is developed to explain the observed size effect on fatigue crack kinetics.
| Original language | English (US) |
|---|---|
| Title of host publication | 48th US Rock Mechanics / Geomechanics Symposium 2014 |
| Editors | Ray Sterling, Emmanuel Detournay, Will Pettitt, Joseph F. Labuz, Lee Petersen |
| Publisher | American Rock Mechanics Association (ARMA) |
| Pages | 482-487 |
| Number of pages | 6 |
| ISBN (Electronic) | 9781634395236 |
| State | Published - 2014 |
| Event | 48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales - Minneapolis, United States Duration: Jun 1 2014 → Jun 4 2014 |
Publication series
| Name | 48th US Rock Mechanics / Geomechanics Symposium 2014 |
|---|---|
| Volume | 1 |
Other
| Other | 48th US Rock Mechanics / Geomechanics Symposium 2014: Rock Mechanics Across Length and Time Scales |
|---|---|
| Country/Territory | United States |
| City | Minneapolis |
| Period | 6/1/14 → 6/4/14 |
Bibliographical note
Publisher Copyright:Copyright (2014) ARMA, American Rock Mechanics Association