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This standard specifies three test methods for determining the tear strength of vulcanized rubber or thermoplastic rubber、 namely: - Method A: using trouser shaped specimens—— Method B: Use a right angle specimen with or without a cut—— Method C: Use a crescent shaped specimen with a cut. The crack strength value is related to the shape of the sample、 tensile speed、 test temperature、 and the rolling effect of vulcanized rubber. Method A; The use of trouser shaped specimens is not sensitive to the length of the incision、 while the cutting edges of the other two specimens require strict control. In addition、 the obtained results are more likely to be related to the basic tearing performance of the material、 However、 it is less affected by the constant extension stress (which is caused by the elongation of the "leg" of the sample and can be ignored)、 and the tearing propagation speed is directly related to the stretching speed of the gripper. Some rubber has an uneven tearing propagation (discontinuous tearing)、 which makes it difficult to analyze the results. Method B、 Test Procedure (a) Using a right angle specimen without a cut、 this test is a combination of tear initiation and tear propagation. The stress at the right angle point rises enough to cause initial tearing、 and then the stress further increases until the specimen tears. However、 only the total force required to destroy the specimen can be determined. Therefore、 the measured force cannot be decomposed into the two components that produce the onset of tearing and the propagation of tearing. Method B、 Test Procedure (b): Use a cut right angle specimen. This test involves pre cutting the specimen and determining the force required for its expansion and tearing. The expansion speed is not directly related to the stretching speed. Method C; Using crescent shaped specimens、 this test also involves pre cutting the specimen to determine the force required for its propagation and tearing、 and the propagation speed is independent of the stretching speed. Note: The method for determining the tear strength of rubber strand small specimens (Delft specimens) is specified separately in ISO 34-2. 2 Normative references: The clauses in the following documents are incorporated into this standard through reference. For dated references、 all subsequent amendments (excluding corrected content) or revisions are not applicable to this standard. However、 Encourage all parties who have reached agreements based on this standard to study whether new versions of these documents can be used. For undated references、 the latest version of * applies to this standard. GB/T 2941 Rubber Physical Test Methods - General Procedures for Sample Preparation and Conditioning (GB/T 2941-2006、 ISO 23529.2004、 IDT) GB/T 12833 Rubber and Plastics - Analysis of Multimodal Curves in the Determination of Tear Strength and Adhesive Strength (GB/T 12833-2006、 ISO 6133; 1998、1DT) GB/T 14838 Rubber and Rubber Products - Determination of Test Methods、 Standards、 and Precision (GB/T 14838-1993、 neq ISO/TR 9272:1986) ISO 5893 Rubber and Plastics Tensile、 Flexural、 and Compression Testing Machines (Constant speed) Technical performance
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