Fatigue behaviour of rock

Author: rcme

August undefined, 2024

WebJan 1, 2009 · Knowledge of fatigue characteristics could also help improve rock-breaking methods. This technical note is oriented towards the appreciation of these characteristics in order to specify the behaviour of rocks during anomalous geo-mechanical events, especially during rock bursts. WebJan 20, 2024 · The fatigue test for rock salt is conducted under different stress amplitudes, loading frequencies, confining pressures and loading rates, from which the evaluation rule of the dissipated energy is revealed and analysed.

Creep-fatigue characteristics of rock salt under different loading ...

WebTo date, many studies have tried to determine the fatigue behavior of soft rock on a laboratory scale. In mining and geotechnical engineering, the surrounding rock is … WebOne of the methods to study the fatigue behavior is the cumulative damage theory. In the literature, there are a few reported research works about the cumulative damage process during the fatigue test in the field of rock mechanics. In this case, Xiao et al. proposed an inverted S-shaped nonlinear fatigue damage cumulative model, which midway university finals schedule

Materials Free Full-Text Fatigue Behavior of Sandstone …

WebFeb 1, 2024 · Fatigue/cyclic loading mainly results in accumulation of plastic deformation and/or damage cycle after cycle. A sample cyclically loaded at constant amplitude finally … WebMay 14, 2014 · Fatigue failure is an important failure mode of engineering materials. The fatigue behavior of both ductile and brittle materials has been under investigation for many years. While the... WebMay 30, 2024 · Researchers are on the agreement that there is a significant effect of cyclic loading history on strength and deformation behavior of rock. Some researchers explored the possibility of explaining the mysterious behavior of rock burst through the fatigue behavior and deformation characteristic under cyclic loading conditions [6, 7]. The cyclic ... midway university canvas log in

STRAIN AND FATIGUE BEHAVIOUR OF ROCK - Transportation …

Experimental and numerical investigation of the fatigue behaviour …

WebGeneral evolution of damages and strains can be observed by means of a three phases cyclic creep and by the evolution of hysteresis loops' geometry. It is concluded that the development of fatigue failure in rocks is closely related to their petrographical, physical and mechanical properties. WebOct 1, 2024 · However, according to the available literature, the mechanical response of jointed rocks to random cyclic loading has never been evaluated, and the influence of the loading parameters (i.e., amplitude and duration) on the fatigue mechanical properties of rocks remains far from being understood. midway university libraryWebNov 1, 2024 · Creep-fatigue tests under different stress paths are conducted on rock salt. • The stress-strain curves, deformation, loading modulus and acoustic emission (AE) counts were systematically analyzed. • The deformation behavior is explained from the viewpoint of micro-mechanism. midway university deans list

"WebFeb 1, 2024 · Fatigue/cyclic loading mainly results in accumulation of plastic deformation and/or damage cycle after cycle. A sample cyclically loaded at constant amplitude finally … " - Fatigue behaviour of rock

Fatigue behaviour of rock

Effect of fatigue loading-confining stress unloading rate on …

WebJul 10, 2024 · The deformation rules and failure types of rock fatigue damage at different temperatures are quite different, and existing constitutive theory cannot describe them quantitatively. A novel rock … WebApr 10, 2024 · It was found that the rock under the cyclic loading with a square waveform had lower fatigue strength and higher fatigue energy compared with that under the …

Did you know?

WebNov 12, 2024 · International Journal of Fatigue, 2015, 77: 50–63. ... The influence of infilling conditions on flaw surface relative displacement induced cracking behavior in hard rock. Rock Mechanics and Rock Engineering, 2024, 53(10): 4449–4470. Article Google Scholar

WebSep 1, 2024 · These two rock types vary noticeably in terms of mineralogy, microstructure, and strength, and their fatigue behavior can be used to represent the fatigue responses of a wide range of rock types. The main objective of this study was to explore the differences in fatigue responses of these two typical rocks. WebDuring the process of mechanized excavation, rock is essentially subjected to cyclic point loading (CPL). To understand the CPL fatigue behavior of rock materials, a series of CPL tests are conducted on sandstone samples by using a self-developed vibration point-load apparatus. The effects of loading frequency and waveform on rock fatigue properties …

WebAug 23, 2024 · The moisture, temperature, and stress level conditions significantly influence the fatigue resistance of rock asphalt concrete. Finally, fatigue equations considering moisture and stress... WebThe fatigue behavior of machine components and devices generally depends on the intrinsic properties of the materials’ resistance, that is, the fatigue limit, and above all on …

WebSep 1, 2016 · According to the experimental results, three-stages of the fatigue behaviour of sandstone were identified. For fatigue damage assessment, b-value is used for strength degradation. It was...

WebJan 1, 2009 · Rock formations, as well as rock structures, are subjected to both static and dynamic loads. Static loads result from sources such as tectonic and gravity forces. Small dynamic loads are continually propagated through natural vibrations of the earth's crust. Large dynamic forces are intermittently applied through major earthquakes, rock bursts ... midway university fall breakWebApr 1, 2024 · In recent years, rock mass instability events resulting from the stress disturbance in cold regions emerge frequently, and a number of studies have paid attention to revealing the cyclic or fatigue mechanical behaviors of pre-flawed rock (Zhou et al. 2024; Wang et al. 2024b). In summary, the above studies have greatly broadened the ... new thrash metal bandsWebTo date, many studies have tried to determine the fatigue behavior of soft rock on a laboratory scale. In mining and geotechnical engineering, the surrounding rock is affected by cyclic blasting vibration, rock drilling disturbance, etc., and the stability of the surrounding rock is related to the safety of the underground structure. midway university job openingsWebFeb 1, 2005 · In this paper, the fatigue behaviour of intact sandstone samples obtained from a rockburst prone coal mine and studied under dynamic uniaxial cyclic loading in the laboratory is presented. Tests were conducted on dry and saturated samples with loading frequencies ranging from 0.1, 1 and 10 Hz and amplitudes of 0.05, 0.1 and 0.15 mm. … midway university library resourcesWebAug 23, 2024 · The moisture, temperature, and stress level conditions significantly influence the fatigue resistance of rock asphalt concrete. Finally, fatigue equations … midway university golf teamWebRelationship among fatigue strength, mean grain size and compressive strength of a rock S. Singh Materials Science 1988 Fatigue tests carried on three sets of samples having different mean grain sizes revealed that fatigue strength is a function of mean grain size of the rock. Samples having smaller grain size show… Expand 55 midway university kentucky athleticsWebIn this regard, Prashanth et al. [132] studied the fracture behaviour of geometrically similar under-reinforced concrete beams with different reinforcement ratios (0.18%, 0.37% and 0.75%) using AE. The variable amplitude fatigue loading with a constant lower load limit and step-by-step rising load limit was applied. new thousand band