Norm

NEN-EN 1723:1995 Ontw. en

Lichte transportbanden - Bepaling van de gerelaxeerde elasticiteitsmodulus

  • Deze norm is ingetrokken sinds 01-08-1999

23,50

Over deze norm

Status Ingetrokken
Aantal pagina's 11
Commissie Transporteurs
Gepubliceerd op 01-01-1995
Taal Engels
Specifies the method of test for the determination of the relaxed elastic modulus of light conveyor belts as defined by EN 873 or other conveyor belts where ISO 9856 is unsuitable. Many applications for light conveyor belts require that the belt is initially tensioned and there is no subsequent change in belt length by adjustment of any rollers. In such case the tensioning force in the belt changes throughout the lift of the belt because of two effects: both permanent stretch and relaxation of the belt changing its real elastic modulus. It is vital to have a means of establishing the way in which the tensioning forces will change and this test applies a cyclic stretching between two defined states of elongation over a large number of cycles. It has been found experimentally that the tensioning force drops in an exponential way. It is possible to measure the tensioning force drops in an exponential way. It is possible to measure the tensioning force and them to calculate what is herein defined as the 'relaxed elastic modulus'. It is important to note that this is not a true elastic modulus, because it includes an element of permanent stretch but, except in cases where the permanent stretch is relatively large, it is a measure of great practical value in determining final tensioning forces. This standard is designed to meet the equirements for such applications.

Details

ICS-code 53.040.20
Nederlandse titel Lichte transportbanden - Bepaling van de gerelaxeerde elasticiteitsmodulus
Engelse titel Light conveyor belts - Determination of the relaxed elastic modulus
Vervangen door
Normatieve verwijzingen
  • 98/37/EG, Machines

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