BS EN ISO 2307:2010 pdf download

BS EN ISO 2307:2010 pdf download.Fibre ropes- Determination of certain physical and mechanical properties (Iso 2307:2010).
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 1968 and the following apply.
3.1
unspliced breaking force
breaking force wt’i.ch is obtained by application of the method descnbed In 9.7.2
3.2
spliced breaking force
breaking force which is obtained by application of the method described in 9.7.3
4 Principle
4.1 Calculation of the linear density
The linear density is obtained by measurement of the mass and the length. under a reference tension, of a
condiftoned test piece.
4.2 Measurement of the lay length and braid pitch
This measurement is taken at the time of application of the reference tension.
4.3 Measurement of the elongation of the rope
This measurement is taken by companng the lengths of a Section of the test piece That nas osen suoectea successively to
a) the reference tension, and
b) a tension equal to 50 % of the minimum specified breaking force for the rope.
4.4 Measurement of the breaking force
This measurement is carried out by increasing the tension in 4.3 b) to the breaking point.
5 Apparatus
5.1 Tensile tasting machine, accommodating the assumed breaking force of the rope, which allows a constant rate of traverse of the moving element, in accordance wIth 9.5, and measurement of the breaking force to an accuracy 0.4 ± 1 %.
Different types of tensile testing machines may be used pulley-tWe grip (cors de chasso” testing machine);
— testing machine with boilards for eye splices;
— wedge-grip testing machine.
In the case of a ‘cors de chasse tensile testing machine, the diameter of the puleys or catches holding down the test pieces shall be equal to at least 10 tImes that of the rope being tested.
In the case of a testing machine with boilards, the diameter of the bollards passing through the eye-spliced test pieces shall be at least twice the diameter of the rope being tested.
9.5 Bedding-in of the test piece
Before testing to the breaking pornt. subject the sample three times to a cycI load between the reference tension and 50 % of the minimum breaking force of the rope. The test speed is (250 ± 50) mmlrnln, unless otherwise specified in a specific rope standard.
9.6 Measurement of the elongation of the rope
Increase the tension again by moving the moving element of the testing maclire The test shall be carried out at a speed 01(250 ± 50) mmlmln. unless otherwise specified in a specific rope standard.
When the tensile force reaches 50 % of the minimum breaking force, measure the drstance between the w marks (the stoppage necessary for measurement shal be as brief as possible). Designate this d,stance as 13, the gauge length, expressed in millimetres, for a tensile force equal to 50% of the specified minimum breaking force.
By previous agreement between the purchaser and supplier, a force-elongation curve, recorded during the tensile tests up to 50 % of the minimum breaking force of the rope. may be supplied.
It may be requested that the elongation be determred on a particular test piece In this case, the procedure given in Annex C shall be followed to obtain the force-elongation coordinates.
9.7 Measurement of the breaking force
9.7.1 Contriue to increase the tension, at the same speed, until a strand breaks.
Record the breaking force and the place on the test piece where the break occurs.
9.7.2 If an unspliced breaking force is specified, the specimen shall be deemed to meet the requirement if the break occurs:
a) within the remarks and at a force equal to or higher than the specified value, or
b) outside the r marks and at a force equal to or higher than 90 % of the specified value,
In the latter case, It should not be assumed that the true breaking force of the specimen would be represented by multiplying the result by 10.9.