What causes stick slip? Stick-slip is a common phenomenon that can occur in seals due to
uneven friction between objects sliding across each other
. This repetitive start-stop movement or vibration known as stick-slip can cause major issues and even failure of mechanical systems, including seals.
Why does stick-slip happen?
The generally agreed upon view is that stick-slip behavior results from common phonon modes (at the interface between the substrate and the slider) that are pinned in an undulating potential well landscape that un-pin (slip) and pin (stick) primarily influenced by thermal fluctuations.
Under what conditions does stick-slip occur?
What characteristics stick-slip?
What is meant by stick-slip?
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
.
How do you prevent stick slips?
- 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.
Who invented slip stick?
An early computing device invented by
Reverend William Oughtred
in London in the 17th century. Primarily for multiplication and division, the slide rule has two stationary sets and one sliding set of numbers in the center.
What is stick-slip phenomenon in CNC machining system?
Stick-slip is
a phenomenon caused by continuous alternating between static and dynamic friction
. It can occur when static friction exceeds dynamic friction, and when there is some elasticity in the system, as illustrated in Figure 3.
Which of the following are the major contributors to rolling friction?
- type of surface on which the wheel is rolling.
- any movement of the surface or below the surface.
- original speed of the wheel.
- diameter of the wheel.
- amount of pressure on the wheel.
- adhesion of the surface.
- any amount of sliding that occurs in addition to the rolling motion.
Is static friction?
Static friction is
a force that keeps an object at rest
. Static friction definition can be written as: The friction experienced when individuals try to move a stationary object on a surface, without actually triggering any relative motion between the body and the surface which it is on.
What is friction measured in?
Mathematically, μ = F/L. Because both friction and load are measured in units of force (such as
pounds or newtons
), the coefficient of friction is dimensionless.
Which is not true about coefficient of friction?
In the case of rolling motion, there is no relative motion between the two contact surfaces. So there is no work done by the friction in a rolling motion. That’s why the
rolling friction is less than the sliding/kinetic friction
. So statement D is not true.
How do you make a stick-slip?
How do you slip stick?
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
.
What is drillstring vibration?
What is drilling vibration?
What is a slide rule do?
Who invented the slide rule?
William Oughtred
When was slide rule invented?
What are the two cause of rolling friction?
Causes of Rolling Friction
1.
The object is usually deformed at the point of contact with the present surface
. 2. The surface is usually deformed at the point of contact with the present object.
What is the cause of friction between two surfaces in contact?
What does sliding friction depend on?
It depends on two variables-
one is material and the other is the weight of the object
. Any change in the surface area in contact does not change the sliding friction. In most of the materials, sliding friction is less than static friction.
What is kinetic friction?
Kinetic friction is defined as
a force that acts between moving surfaces
. A body moving on the surface experiences a force in the opposite direction of its movement. The magnitude of the force will depend on the coefficient of kinetic friction between the two materials.
What is a sliding friction?
Definition of sliding friction
:
the friction between two bodies that are in sliding contact
. — called also kinetic friction.
What is fluid friction?
What increases friction?
To increase friction,
the surfaces in contact have to be made rough
. The two surfaces in contact can also be pressed harder to increase force between them. Use of adhesive materials that stick surfaces , also increases friction between them.
What produces friction?
What are the four types of friction?
What material has the highest coefficient of friction?
- Silver on Silver. 1.4.
- Aluminium on Aluminium. 1.05 – 1.35.
- Platinum on Platinum. 1.2.
- Cast Iron on Cast Iron. 1.1.
- Copper on Cast Iron. 1.05.
- Copper on Copper. 1.0.
- Iron on Iron. 1.0.
- Steel on Lead. 0.95.
How do you increase coefficient of friction?
Can friction be increased?
Friction can be increased by:
making the surfaces rough
. pressing the surfaces harder against each other (by increasing normal force).
