BS EN ISO 283:2015 pdf download – Textile conveyor belts — Full thickness tensile strength, elongation at break and elongation at the reference load — Test method.
1 Scope This International Standard specifies a test method for the determination of the full thickness tensile strength in the longitudinal direction and the elongation at the reference force and breaking point of conveyor belts having a textile carcass. The method can also be used for the determination of full thickness tensile strength in the transverse direction and the elongation at the breaking point, for use when the manufacturer is requested by the purchaser to state values for these properties. This International Standard is not suitable or valid for light conveyor belts as described in ISO 21183-1. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 7500–1, Metallic materials — Verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Verification and calibration of the force-measuring system ISO 18573, Conveyor belts — Test atmospheres and conditioning periods 3? Terms? and? definitions For the purposes of this document, the following terms and definitions apply. 3.1 tensile strength greatest measured force during the tensile test divided by the width of the test piece Note 1 to entry: It is expressed in N/mm.
3.2 nominal tensile strength specified minimum value of the tensile strength Note 1 to entry: It is expressed in N/mm. 3.3 reference force reference load one-tenth of the nominal tensile strength in the longitudinal direction multiplied by the width of the test piece in mm EXAMPLE Nominal tensile strength = 1 600 N/mm; one tenth of the nominal tensile strength = 160 N/mm; reference force for 25 mm test piece = 25 mm × 160 N/mm = 4 000 N. Note 1 to entry: It is expressed in N/mm.
3.4 elongation at break elongation at the greatest force (load) Note 1 to entry: It is expressed as the percentage increase in the distance between two reference points. 3.5 elongation at the reference force (load) elongation at the reference force (load) in the longitudinal direction Note 1 to entry: It is expressed as the percentage increase in the distance between two reference points. 4 Principle A test piece, cut from the full thickness of the conveyor belt, is extended under specified conditions using a tensile testing machine, until rupture of the test piece occurs. 5 Apparatus 5.1 Tensile testing machine, of CRE or CRT type, calibrated to Grade 1 according to ISO 7500-1 and capable of extending the test piece at a constant rate, without interruption, of (100 ± 10) mm/min. 5.2 Device, such as an extensometer, with a measuring length of at least 100 mm and accurate to within 0,1 mm or better, capable of measuring the elongation of the gauge length marked on the test piece. Use of a device that produces a graphical trace throughout the test is preferred. 5.3 Grips, the form of which should prevent any slippage of the test piece during the tensile test. The use of grips with transverse serrations in accordance with Figure 1 is recommended.