Norm

NEN-ISO 34-1:2015 en

Gevulkaniseerde of thermoplastische rubber - Bepaling van de scheursterkte - Deel 1: Broek, hoek en halvemaanvormige proefstukken

79,70

Over deze norm

Status Definitief
Aantal pagina's 15
Commissie Rubber
Gepubliceerd op 01-06-2015
Taal Engels
NEN-ISO 34-1 specifies three test methods for the determination of the tear strength of vulcanized or thermoplastic rubber, namely the following: - method A, using a trouser test piece; - method B, using an angle test piece, with or without a nick of specified depth; - method C, using a crescent test piece with a nick. The value of tear strength obtained depends on the shape of the test piece, speed of stretching, and temperature of test. It can also be susceptible to grain effects in rubber. Method A: Using a trouser test piece Method A, using the trouser test piece, is preferred because it is not sensitive to the length of the cut, unlike the other two test pieces in which the nick has to be very closely controlled. In addition, the results obtained are more easily related to the fundamental tear properties of the material and are less sensitive to modulus effects (provided that the leg extension is negligible) and the rate of propagation of the tear is directly related to the rate of grip separation. With some rubbers, the propagation of tear is not smooth (knotty tear), and analysis of results can be difficult. Method B, procedure (a): Using an angle test piece without nick This test is a combination of tear initiation and propagation. Stress is built up at the point of the angle until it is sufficient to initiate a tear and then further stresses propagate this tear. However, it is only possible to measure the overall force required to rupture the test piece, and, therefore, the force cannot be resolved in two components producing initiation and propagation. Method B, procedure (b): Using an angle test piece with nick This test measures the force required to propagate a nick already produced in the test piece. The rate of propagation is not directly related to the jaw speed. Method C: Using a crescent test piece. This test also measures the force required to propagate a nick already produced in the test piece, and the rate of propagation is not related to the jaw speed.

Details

ICS-code 83.060
Nederlandse titel Gevulkaniseerde of thermoplastische rubber - Bepaling van de scheursterkte - Deel 1: Broek, hoek en halvemaanvormige proefstukken
Engelse titel Rubber, vulcanized or thermoplastic - Determination of tear strength - Part 1: Trouser, angle and crescent test pieces
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