ISO 283:2015 pdf free
ISO 283:2015 pdf free.Textile conveyor belts – Full thickness tensile strength,elongation at break and elongation at the reference load
Across the longitudinal axis of the test piece and at right angles to it, draw reference lines 100 mm apart and equidistant from the centre of the test piece (see Figure 3, Figure 4, Figure 5, and Figure 6).
Measure the width of the test piece at the centre of the middle section, i.e. between the reference lines,using a vernier gauge capable of reading to at least 0,1 mm.
If the covers of the belt are very thick or of very different thicknesses, the test may be performed without covers or with reduced covers, to avoid slippage of the test piece in the grips.
For certain types of belt construction, the shapes of the test pieces illustrated in Figure 3, Figure 4,Figure 5, and Figure 6 produce abnormal and unequal stress distributions in the threads of the carcass,causing systematic slip in the grips and giving misleading results. Under such circumstances, the test may be conducted using test pieces of a different shape.
Three test pieces shall be selected from the longitudinal direction of the belt and, if appropriate, three shall be selected from the transverse direction of the belt.
Condition the test pieces in accordance with ISO 18573, using atmosphere A, B, or C, and carry out the tests immediately after completion of the conditioning period.
If a preload is applied to the test piece at the start of the test, this shall not exceed 0,5 % of the nominal tensile strength.
Start the machine and extend the test piece at a constant, uninterrupted speed of (100±10) mm/min. If using a test piece taken from the longitudinal direction of the belt, record the increase in gauge length when the reference force (see 3..3) is reached. Continue the test until the force recording device reaches a maximum value or the test piece breaks, or until the first sign of destruction of the carcass is apparent.
Record this maximum force and the increase in gauge length at this force.
If the test piece does not break between the reference lines or if the test piece slips in the grips during the test, discard any result so obtained and repeat the test on a fresh (new) test piece. ISO 283 pdf download.
