Tensile load test

Tensile load test is a test for the viscoelastic plastics and elastomers. It is important to recognize that these factors should be of concern and that standard material test methods often have to be modified to reflect this concern.

insulator

Tensile load test:
Three samples shall be subjected to a tensile load that shall be increased rapidly but smoothly from zero to 75% of specified mechanical load (SML) and then gradually be increased to the SML in a time between 30 and 90 seconds.
If 100% of the SML is reached in less than 90 seconds. The tensile load test is passed if on failure occurs. The load shall then be increased until the insulator fails. The historical failure loads shall justify the manufacturer’s choice of SML.
Tensile load test reasons:
The element of time plays an important role in characterizing the mechanical properties on many polymer materials, particularly plastics and elastomers. Both plastics and elastomers share some of the features of a viscous fluid where stress is proportional to strain rate but independent of the strain itself, that is, they are viscoelastic. Thus, it becomes important to be concerned about how long the material must sustain load, how fast it is loaded, and how far it is compressed or elongated. It is important to recognize that these factors should be of concern and that standard material test methods often have to be modified to reflect this concern.


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