BS EN ISO 7622-1:2013 pdf free

BS EN ISO 7622-1:2013 pdf free.Steel cord conveyor belts一Longitudinal traction test
This part of ISO 7622 specifies a method for the determination of the elongation ofsteel cords constituting the carcass of conveyor belts, when subjected to a force corresponding to 10 % and 60 % of the specified tensile strength.
It applies exclusively to conveyor belts with a steel carcass.
NOTE A method for the determination of tensile strength is specified in IS0 7622-2.
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 18573, Conveyor belts一Test atmospheres and conditioning periods
The traction test is carried out on a steel cord, taken from the carcass of the belt. Determination of the elongation is measured using an extensometer, at 10 % and 60 % of the specified tensile strength, by using,
for example, a dynamometer, the rate of separation of the jaw of which is specified and maintained constant.
Dynamometric tensile testing machine, complying with the following requirements:
a) the force exerted by the machine shall be adaptable to the strength of the test specimen;
b) it shall be possible for the rate of separation of the jaws to be set at 25 mm/min土5 mm/min and be maintained constant;
c) the separation between the jaws shall be capable of being at least 250 mm.
As the elongation of steel cords is generally very low, accurate, but sensitive, extensometers, which could be damaged if the test specimen should break, have to be used. For this reason, the measurement is limited to 60 % of the specified tensile strength.
It is preferable that an extensometer be able to accommodate the cord rotation which occurs due to its twisted nature.
Express the elongation as a percentage of the initial length.
Take as the result the arithmetic mean value of the four measurements made at 10 % and at 60 % of the specified minimum tensile strength.
Express the result to the nearest 0,1 %.BS EN ISO 7622-1 pdf download.