slip–stick phenomenon at the transition from static to dynamic friction

Description:

• Friction is the resistance of a body against movement on a base.
• Static friction means that a body remains at rest under the action of a force.
• If a limit value is exceeded, the body begins to move on the base, resulting in dynamic friction.
• Self-excited friction oscillations, also known as slip–stick phenomenon, occur if the static friction is significantly higher than the dynamic friction.
• The tribological system in TM 260.04allows a clear demonstration of the transition from static to dynamic friction and the occurrence of friction oscillations.
• The experimental unit contains a rotating stainless-steel disk and a loosely fitting friction ring as the friction pair.
• The contact force between the friction partners can be adjusted gradually up to a maximum of 40 N by means of weights.
• A tension spring prevents the friction ring from rotating.
• The necessary holding force is measured by a force sensor.
• The TM 260drive unit is required in order to conduct experiments.
• The experimental unit is mounted quickly and easily on the frame of the drive unit with quick-action chucks.
• The disk is driven by a clampable coupling between drive unit and gear unit.
• The display and control unit of the drive unit shows frictional force and speed and allows the continuous adjustment of the speed.
• The frictional force and the coefficient of friction can be determined in experiments.
• The frictional forces are measured by a force sensor.
• Friction rings made of different materials are included in the scope of delivery to study different friction pairings.

Technical Details:

Specifications:

• friction oscillations at static and dynamic friction
• quick and easy assembly of the experimental unit on the frame of the drive unit
• rotating stainless steel disk
• disk is driven by a clampable coupling between drive unit and gear unit
• friction ring of different materials: stainless steel, brass or plastic (PA)
• friction pair subject to load by stepped weights
• frictional force measured by force sensor
• displays of force and speed and speed adjustment on the drive unit

Technical Data:

• Disk:
  • Ø: 60mm
  • stainless steel
• Friction ring:
  • outer diameter: 80mm
  • inner diameter: 50mm
  • 1x stainless steel
  • 1x brass
  • 1x plastic (PA)
• Force sensor for frictional force:
  • 0…50N
• Weights:
  • 1x 5N
  • 3x 10N

Dimensions & Weight:

• Weight: approx. 7kg

Learning Objectives/Experiments:

• together with the drive unit:
• observation of the transition from static to dynamic friction
• influence of lubrication on slip–stick phenomenon
• influence of the force between the friction partners on the slip–stick phenomenon
• influence of the relative velocity of the friction partners on the slip–stick phenomenon

Scope of Delivery:

• 1 experimental unit
• 1 disk
• 1 friction ring
• 1 spring
• 1 set of weights
• 1 set of instructional material

Features:

• slip–stick phenomenon at the transition from static to dynamic friction
• friction rings of different materials for the study of different friction pairings

Accessories:

• Required:
• TM 260Drive unit for tribological investigations

Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.