What is meant by stick-slip phenomenon?
Stick slip phenomenon, or stick-slip, is the jerky motion that can occur while two materials are sliding over each other.
What is an example of stick-slip motion?
Stick–slip occurs in many situations where frictional excitation is present, for example a violin bow acting on the string.
What is stick-slip in tribology?
Stick-slip is generally a dynamic cyclic process where two mating surfaces oscillate between a stick phase and a slip phase. In the stick phase, the two surfaces are not in motion and are held in place by so-called static friction.
What is stick-slip in drilling?
Deep drilling assembly. Stick–slip is simply a periodic succession of sticking phases, where the bit stops, and slipping phases, where the rotational speed of the bit can reach up to 2–3 times the RPM, imposed at the surface.
What is stick-slip phenomenon in CNC machining system?
The stick-slip phenomenon, also known as the slip-stick phenomenon or simply stick-slip, is the spontaneous jerking motion that can occur while two objects are sliding over each other.
What causes stick-slip behavior on a fault surface?
The spring keeps pulling until suddenly, the block slips forward and the force in the spring drops. The cycle begins again with the force applied by the spring increasing until the block suddenly slips again. This is called stick-slip behavior.
What phenomenon happens if plates or rocks stick and then slip or shake?
Before an earthquake, the buildup of stress in the rocks on either side of a fault results in gradual deformation. Eventually, this deformation exceeds the frictional force holding the rocks together and sudden slip occurs along the fault.
What characteristics stick-slip?
Stick-slip can be described as surfaces alternating between sticking to each other and sliding over each other, with a corresponding change in the force of friction. Typically, the static friction coefficient (a heuristic number) between two surfaces is larger than the kinetic friction coefficient.
Who developed slip stick?
This is a simple laboratory demonstration of the stick-slip phenomenon, so named in 1939 by F. P. Bowden and L. L. Leben, physical chemists at the University of Cambridge, who built an apparatus to study the process. [see chart at lower right on page 112].
What is stick slip vibration?
Stick—slip vibrations are self-sustained oscillations induced by dry friction. They occur in engineering systems as well as in our everyday life, e.g. the sound of bowed instruments results from stick—slip vibrations of the strings.
How does stick slip affect drilling performance and the drill string?
Stick-slip vibrations decrease drilling efficiency, degrade borehole quality, provoke premature drill-bit wear, and cause drill-string failures.
How do you stop a stick-slip?
The conventional method of mitigating stick-slip is increasing RPM and/or decreasing weight on bit (WOB), which is inefficient and can induce bit-damaging lateral vibration. By using the SoftSpeed II system, higher WOB can be achieved at a given RPM before stick-slip foundering occurs (Fig. 1).
What caused the stick to bend earthquake?
As you bend a stick, energy (strain) builds up until the stick breaks and the energy is released. This is similar to what happens in an earthquake. In the earth, rocks bend and then they break.
What part of the crust that sticks and slips How does the movement cause the earthquake to occur?
The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth’s crust and cause the shaking that we feel.
What is stick slip phenomenon in CNC machining system?
What is stick-slip in hydraulic cylinders?
In the area of seals and cylinders, Stick-slip is characterized by a distinct stop-start movement of the cylinder, and may be so rapid that it resembles severe vibration, high pitched noise or chatter. Seals are often thought to be the source of the stick-slip, but other components or hardware can create this issue.
How do you overcome stick slips?
How to Avoid Stick-Slip in Your Seals
- Material hardness, elasticity, friction, and chemical properties: ensure compatibility between surfaces.
- Surface roughness: ensure shafts or cylinders are neither too smooth nor too rough.
- Fluid lubricity: change fluid if necessary, or use oil treatments or friction reducers.
What is stick-slip friction?
How does stick-slip affect drilling performance and the drill string?
Is stick slip behavior required for earthquake slip?
Many phenomena are caused by stick-slip behavior, such as the music produced by bowed instruments, the noise of car brakes and even the sound from grasshoppers. In rock friction experiments, stick-slip behavior is the laboratory equivalent of the earthquake process.
What is stick-slip phenomenon?
Jump to navigation Jump to search. The stick-slip phenomenon, also known as the slip-stick phenomenon or simply stick-slip, is the spontaneous jerking motion that can occur while two objects are sliding over each other.
What is stick slip in geology?
Jump to Navigation. stick-slip Stick slip refers to the fast movement that occurs between two sides of a fault when the two sides of the fault become unstuck. The rock becomes distorted, or bent, but holds its position until the earthquake occurs.
What is stiction (stick slip)?
Stick-slip, also referred to as “stiction,” is the bane of engineers and machine builders who need smooth, precise motion.
Is there a sticking-sliding phenomenon in physics?
In the constructed model, a sticking-sliding phenomenon, which reflects the saw-tooth behavior of the frictional force in time, can become apparent at certain parameters. For the equations set (6-7) there is the solution instability with respect to small perturbations.