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ELASTOMERIC O-RINGS
Elastomeric materials are frequently tested in the form of rings either because the finished product is an o-ring or because ring-shaped samples can be readily prepared. Tensile testing of ring specimens requires a special fixture.
Principle of Operation
Designed for testing elastomeric materials in the form of rings, these fixtures avoid local stress concentrations by using a lower spindle that is rotated by a toothed belt driven from the moving crosshead. The upper spindle rotates freely and the rotation frequency of the lower spindle is easily selected by moving the toothed belt from one pulley to another. The simple drive mechanism avoids the need for lubricants or separate electric motors.
Application Range
• Tensile testing of elastomeric rings to a variety of international standards
Safety Advice
Review safety note on page 234
O-RING FIXTURES
ELASTOMERIC O-RINGS
Spindles
Different o-ring diameters and thicknesses require different spindles in order to provide more accurate tests. The spindle is the component that hooks inside the o-ring and pulls on it during test. The spindles must be used in conjunction with a suitable o-ring test fixture.
Principle of Operation
The spindles come in different sizes specified by testing standards or by a specific need. The main fixture remains on the system, and the spindles can be easily interchanged to accommodate the specimen.
Application Range
• Tensile testing of elastomeric rings to a variety of international standards
2717-07x Spindle
