scholarly journals Transition between stable sliding and stick-slip due to variation in slip rate under variable normal stress condition

1998 ◽  
Vol 25 (17) ◽  
pp. 3235-3238 ◽  
Author(s):  
Changrong He ◽  
Shengli Ma ◽  
Jianguo Huang
Keyword(s):  
Normal Stress ◽  
Stress Condition ◽  
Slip Rate ◽  
Stick Slip ◽  
Stable Sliding

Normal load, slip rate and roughness influence on the polymethylmethacrylate dynamics of sliding 1. Stable sliding to stick-slip transition

Wear ◽  
1998 ◽  
Vol 214 (2) ◽  
pp. 156-164 ◽  
Author(s):  
S. Bouissou ◽  
J.P. Petit ◽  
M. Barquins
Keyword(s):  
Normal Load ◽  
Slip Rate ◽  
Stick Slip ◽  
Slip Transition ◽  
Stable Sliding

scholarly journals Fracture asperity evolution during the transition from stick slip to stable sliding

2021 ◽  
Vol 379 (2196) ◽  
pp. 20200133
Author(s):  
Cheng Mei ◽  
Wei Wu
Keyword(s):  
Normal Stress ◽  
Contact Area ◽  
Deterministic Chaos ◽  
Acoustic Energy ◽  
Radius Of Curvature ◽  
Stick Slip ◽  
Transition Stage ◽  
Fracture Dynamics ◽  
Stress Dependent ◽  
Stable Sliding

Fracture asperities interlock or break during stick slip and ride over each other during stable sliding. The evolution of fracture asperities during the transition between stick slip and stable sliding has attracted less attention, but is important to predict fracture behaviour. Here, we conduct a series of direct shear experiments on simulated fractures in homogeneous polycarbonate to examine the evolution of fracture asperities in the transition stage. Our results show that the transition stage occurs between the stick slip and stable sliding stages during the progressive reduction in normal stress on the smooth and rough fractures. Both the fractures exhibit the alternative occurrence of small and large shear stress drops followed by the deterministic chaos in the transition stage. Our data indicate that the asperity radius of curvature correlates linearly with the dimensionless contact area under a given normal stress. For the rough fracture, a bifurcation of acoustic energy release appears when the dimensionless contact area decreases in the transition stage. The evolution of fracture asperities is stress-dependent and velocity-dependent. This article is part of the theme issue ‘Fracture dynamics of solid materials: from particles to the globe’.

Normal load, slip rate and roughness influence on the PMMA dynamics of sliding. 2. Characterization of the stick-slip phenomenon

1999 ◽  
Vol 21 (2) ◽  
pp. 128
Author(s):  
S. Bouissou ◽  
J.P. Petit ◽  
M. Barquins
Keyword(s):  
Normal Load ◽  
Slip Rate ◽  
Stick Slip ◽  
Slip Phenomenon

Large-Scale Evaluation of Constrained Bearing Elements Made of Thermosetting Polyester Resin and Polyester Fabric Reinforcement

2006 ◽  
Vol 128 (4) ◽  
pp. 681-696 ◽  
Author(s):  
P. Samyn ◽  
W. Van Paepegem ◽  
J. S. Leendertz ◽  
A. Gerber ◽  
L. Van Schepdael ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Large Scale ◽  
Elastic Recovery ◽  
Small Scale ◽  
Practical Implementation ◽  
Fiber Failure ◽  
Stick Slip ◽  
Composite Surface ◽  
Pull Out ◽  
Stable Sliding

Polymer composites are increasingly used as sliding materials for high-loaded bearings, however, their tribological characteristics are most commonly determined from small-scale laboratory tests. The static strength and dynamic coefficients of friction for polyester/polyester composite elements are presently studied on large-scale test equipment for determination of its bearing capacity and failure mechanisms under overload conditions. Original test samples have a diameter of 250 mm and thickness of 40 mm, corresponding to the practical implementation in the sliding surfaces of a ball-joint, and are tested at various scales for simulation of edge effects and repeatability of test results. Static tests reveal complete elastic recovery after loading to 120 MPa, plastic deformation after loading at 150 MPa and overload at 200 MPa. This makes present composite favorable for use under high loads, compared to, e.g., glass-fibre reinforced materials. Sliding tests indicate stick-slip for pure bulk composites and more stable sliding when PTFE lubricants are added. Dynamic overload occurs above 120 MPa due to an expansion of the nonconstrained top surface. A molybdenum-disulphide coating on the steel counterface is an effective lubricant for lower dynamic friction, as it favorably impregnates the composite sliding surface, while it is not effective at high loads as the coating is removed after sliding and high initial static friction is observed. Also a zinc phosphate thermoplastic coating cannot be applied to the counterface as it adheres strongly to the composite surface with consequently high initial friction and coating wear. Most stable sliding is observed against steel counterfaces, with progressive formation of a lubricating transfer film at higher loads due to exposure of PTFE lubricant. Composite wear mechanisms are mainly governed by thermal degradation of the thermosetting matrix (max. 162°C) with shear and particle detachment by the brittle nature of polyester rather than plastic deformation. The formation of a sliding film protects against fiber failure up to 150 MPa, while overload results in interlaminar shear, debonding, and ductile fiber pull-out.

scholarly journals Frictional heating on faults: Stable sliding versus stick slip

1998 ◽  
Vol 103 (B4) ◽  
pp. 7413-7420 ◽  
Author(s):  
Stephen R. Brown
Keyword(s):  
Frictional Heating ◽  
Stick Slip ◽  
Stable Sliding

Stick slip, stable sliding, and earthquakes-Effect of rock type, pressure, strain rate, and stiffness

1968 ◽  
Vol 73 (18) ◽  
pp. 6031-6037 ◽  
Author(s):  
James D. Byerlee ◽  
W. F. Brace
Keyword(s):  
Strain Rate ◽  
Rock Type ◽  
Stick Slip ◽  
Stable Sliding ◽  
Type Pressure

What controls b-value variations: insights from a physics based numerical model

2020 ◽  
Author(s):  
Pierre Dublanchet
Keyword(s):  
Creep Rate ◽  
Normal Stress ◽  
Acoustic Emissions ◽  
Slip Rate ◽  
B Value ◽  
Power Exponent ◽  
Power Law Distribution ◽  
Differential Stress ◽  
B Values ◽  
Stress Dependent

<p>The magnitudes of earthquakes are known to follow a power-law distribution, where the frequency of earthquake occurrence decreases with the magnitude. This decay is usually characterized by the power exponent, the so-called b-value. Typical observations report b-values in the range 0.5-2. The origin of b-value variations is however still debated. Seismological observations of natural seismicity indicate a dependence of the b-value with depth, and with faulting style, which could be interpreted as a signature of a stress dependence. Within creeping regions of major tectonic faults, the b-value of microseismicity increases with creep rate. Stress dependent b-value of acoustic emissions is also commonly reported during rock failure experiments in the laboratory. Natural and laboratory observations all support a decrease of b-value with increasing differential stress. I report here on the origin of b-value variations obtained in a fault model consisting in a planar 2D rate-and-state frictional fault embedded between 3D elastic slabs. This model assumes heterogeneous frictional properties in the form of overlapping asperities with size-dependent critical slip distance distributed on a creeping segment. This allows to get complex sequences of earthquakes characterized by realistic b-values. The role of frictional heterogeneity, normal stress, shear stress, and creep rate on the b-value variations is systematically explored. It is shown that the size distribution of asperities is not the only feature controlling the b-value, which indicates an important contribution from partial ruptures, and cascading events. In this model cascades of events (and thus b-value) is strongly influenced by frictional heterogeneity and normal stress through fracture energy distribution. If the decrease of b-value with differential stress is reproduced in these simulations, it is also shown that part of the b-value fluctuations could be attributed to changes of nucleation length and stress drop with normal stress. A slight increase of b-value with slip rate exists but remains an order of magnitude smaller than the observations.</p>

Dynamics of foreshocks and pre-slip during the nucleation of laboratory earthquakes

2020 ◽  
Author(s):  
Alexandre Schubnel ◽  
Samson Marty ◽  
Blandine Gardonio ◽  
Harsha Bhat ◽  
Eiichi Fukuyama ◽  
...  
Keyword(s):  
Source Parameters ◽  
Scaling Law ◽  
Sampling Rate ◽  
Acoustic Emissions ◽  
Slip Rate ◽  
Absolute Magnitude ◽  
Temporal Variations ◽  
P Wave ◽  
Time Data ◽  
Stick Slip

<p>Over the past decades, an increasing number of seismological observations and improvement in data quality have allowed to better detect <span>foreshock sequences prior to earthquakes. However, due to strong spatial and temporal variations of foreshock occurrence, their underlying physical processes and their links to earthquake nucleation are still under debate. Here we address these issues by looking at precursory acoustic activity during laboratory earthquakes (stick-slip instabilities).<br></span></p><p><span>Here, laboratory earthquake experiments were performed on saw-cut Indian metagabbro under upper crustal stress conditions ranging from 30 to 60 MPa confining pressure. Using a high-frequency monitoring system and calibrated piezoelectric acoustic sensors we continuously record particle velocity field at 10 MHz sampling rate during the experiments. Based on a trigger logic we identify acoustic emissions (AE) within continuous data. From P-wave arrival-time data and from spectral analysis we are able to estimate the following seismological parameters for each AE: location, </span>absolute magnitude, stress-drop and size.</p><p>First, we show that the source parameters of AE (Mw -9.0 to Mw -7.0) follow the same scaling relationship as natural earthquakes justifying the use of acoustic precursors as proxy to foreshocks. We observe that foreshock triggering is systematically related to aseismic slip and that the dynamics of foreshocks mirrors the acceleration of slip-rate preceding failure. Experimental scalings demonstrate that : i- the nucleation evolves  from an aseismic process into a cascading one, and ii) the duration and magnitude of the pre-seismic moment correlates with the magnitude of the mainshock, at least at the scale of the laboratory. Finally, using Hertz contact theory, we find a scaling law between the seismic energy released by foreshocks, the fault roughness  and the normal stress acting on the fault interface.</p>

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