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Coefficient Of Friction Fixture – TJ 150
Coefficient of friction fixture consists of a horizontal flat bed incorporating a sled. The underside of the sled has a layer of smooth-faced foam rubber. It uses the tensile motion of the tester to measure the force it takes to pull a weighted sled covered in the tester material fake watches across a surface.
In principle, the test specimen is supported on a friction table, consisting of a horizontal test table, a sled, and a driving mechanism via a pulley to replique montre produce a relative motion between the sled and the test table. One piece of the material is attached to the table with double sided adhesive tape. The other piece is wrapped around the sled and secured replica watches uk on the top of the sled with double sided adhesive tape. This sled is then placed onto the specimen on the table. The test machine is driven at a constant rate of displacement, which drags the sled across the length of the specimen on the table. The force is recorded, and replica watchestest results are calculated for static and kinetic coefficient of friction.
Description:
The model TJ 150 coefficient of friction fixture is a testing fixture to measure the static and kinetic coefficient of friction of plastic film and sheet using the ASTM D 1894 standard.
The major items of the fixture include a square metal sled wrapped with a thick foam pad and a rectangular shape metal table with a rolex replica watches defined surface finish. A pulley is located at one end of the table which allows the sled, when attached to the crosshead via a nylon or metal tow line to be pulled horizontally along the plate. Test material can be attached to either the sled or the plate or both
Application:
Used to determine the static and kinetic coefficients of friction of plastic film and paper when sliding the specimen over itself under controlled test conditions. A sheet of the specimen is secured to a horizontal bed and another sample of the specimen is drawn across the test bed specimen. This measure the force required to overcome the frictional resistance between the two imposed surfaces, when one surface is moved relative to the other along their plane of contact. The static coefficient of friction is determined by the force required to overcome the initial resistance between the two surfaces. The kinetic coefficient of friction is determined from the subsequent force when continuously sliding at a constant rate.
Features:
- Mounts to the Dak test instrument using the standard base & load cell adapter
- For measurement of slip friction to ASTM specification D 1894.
- Specimen can be mounted to the sled, the plate or both
- Allows precise measurement of the static and kinetic coefficient of friction
- Fixture includes both a nylon and a metal tow line
- Adaptable to most standard universal testing instruments.
Principal Of Operation:
The coefficient of friction test fixture consists of a fixed horizontal table and a moveable sled. Both the table and sled can be covered with the test material. A tow line attaches the sled to a low force load cell with a pulley guiding the tow line during the test. The fixture is mounted to the base of the instrument and, as the crosshead/ load cell moves, the sled is pulled across the horizontal table. Data is recorded from the load cell during the test and analyzed to determine both static and kinetic friction. The static friction is derived from the first maximum peak (force) on the load curve and kinetic friction is derived from the average force between two predefined points. The coefficient of friction is defined as the recorded force divided by the mass of the sled.