IS0 37:1994 pdf download – Rubber, vulcanized or thermoplastic – Determination of tensile stress-strain properties.
1 Scope This International Standard describes a method for the determination of the tensile stress-strain properties of vulcanized and thermoplastic rubbers. The proper- ties which may be determined are the tensile strength, the elongation at break, the stress at a given strain and the elongation at a given stress. Means of specifying or determining the yield point are also given. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publi- cation, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most re- cent editions of the standards indicated below. Members of IEC and IS0 maintain registers of cur- rently valid International Standards. IS0 471: -l), Rubber – Times, temperatures and hu- midities for conditioning and testing. I SO 1826: 1981, Rubber, vulcanized – Time-in ten/al between vulcanization and testing – Specification. IS0 3383: 1985, Rubber – General directions for achieving elevated or subnormal temperatures for test purposes. I SO 4648: 1991, Rubber, vulcanized or thermoplastic – Determination of dimensions of test pieces and products for test purposes.
3 Definitions For the purposes of this International Standard, the following definitions apply. 3.1 tensile stress, S: A stress applied so as to ex- tend the test piece. It is calculated as the applied force per unit area of the original cross-section of the test length. 3.2 elongation, E: The extension, expressed as a percentage of the test length, produced in the test piece by a tensile stress. 3.3 tensile strength, TS: The maximum tensile stress recorded in extending the test piece to break- ing point. [See figures 1 a) to 1 c).] 3.4 tensile strength at break, TS,: The tensile stress recorded at the moment of rupture. [See fig- ures 1 a) to 1 c).] NOTE 1 The values of TS and TS, may be different if, after yield Sv, the elongation continues and is accompanied by a drop in stress, resulting in TS, being lower than TS. [See figure 1 c).]