Mezikus Designed zstm 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. Bluehill LE for Basic Testing. The versatility of an O-ring allows it to function in multiple modalities. Fixture — The standard specifies a fixture consisting of two spools to hold an o-ring while under test.
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Ultimate Elongation Equipment required: 1. At least 30 inches of crosshead travel or more for high elongation materials C.
Most small and common 1kN pound load capacity machines will work for the loads of the materials tested to this specification D. All of our eXpert series dual column machines meet these requirements, and it is also common to use our single column eXpert XL with 53 inches of crosshead travel. ASTM D requires special grips.
These grips have interchangeable spools with various diameters for a wide variety of o-rings. The spools rotate freely on a pin extending from the grip. If using the motorized version, the bottom grip and spool is connected to a small variable speed electric motor to enable rotation during the test to minimize stresses.
Other more primitive and costly systems have been employed that generate rotation from the upward movement of the crosshead. However, the optional motorized version is easier to use and is usually less expensive.
In this case, you would just use two of the upper grips.