BS/EN 826-2013 pdf download.Thermal insulating products for building applications Determination of compression behaviour.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its apphcation. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 12085, Thermal insulating products for building applications — Determination of linear dimensions of test specimens
ISO 5725-1, Accuracy (trueness and precision) of measurement methods and results — Part 1: General principles and definitions
ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method for the determination of repeatability and reproducibility of a standard measurement method
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
relative deformation
ratio of the reduction in thickness of the test specimen to its initial thickness, d0, measured in the direction of loading
3.2
compressive strength
ratio of the maximum compressive force. Fm, reached when the strain, at yield (see Figure 1 b)) or rupture (see Figure la)) is less than 10 %, to the initial cross-sectional area of the test specimen
3.3
compressive stress at 10 % strain
ratio of the compressive force, F10, at 10 % strain, e, to the initial cross section of the test specimen (see Figures ic) and ld)) for products presenting 10 % strain before possible yield or rupture
3.4
compression modulus of elasticity
E
compressive stress divided by the corresponding strain below the proportional limit, when the relationship is linear
Note 1 to entry: See Figure 1.
4 Principle
A compressive force is applied at a given rate of displacement perpendicular to the major faces of a squarely cut test spedmen arid the maximum stress supported by the specimen calculated.
In case of tapered products, the test specimens should be cut to obtain two parallel faces.
When the value of the maximum stress corresponds to a strain of less than 10 %, it is designated as compressive strength and the corresponding strain is reported. If no failure is observed before the 10 % strain has been reached, the compressive stress at 10 % strain is calculated and its value reported as compressive stress at 10 % strain.
5 Apparatus
5.1 Compression testing machine
Compression testing machine, designed to suit the range of force and displacement involved and having two very rigid, polished, square or circular plane parallel platens with a minimum side length (or diameter) equal to the side length (or diagonal) of the test specimen. One of the plates shall be fixed and the other movable, if appropriate, with a centrally positioned ball joint to ensure that only axial force is applied to the test specimen. The movable plate shall be capable of moving at a constant rate of displacement in accordance with Clause 7.
5.2 Measurement of displacement
Displacement measuring device, fitted to the compression testing machine, which allows continuous measurement of the displacement of the movable plate to an accuracy of ± 5 % or ± 0,1 mm, whichever is smaller (see 5.3).
5.3 Measurement of force
Sensor fitted to one of the machine plates to measure the force produced by the reaction of the specimen upon the plates. This sensor shall be such that its own deformation during the measuring operation is negligible compared with that being measured or, if not, it shall be taken into account by calculation. In addition, it shall allow the continuous measurement of the force to an accuracy of ± 1 %.
5.4 Recording device
Device for the simultaneous recording of the force, F, and the displacement, .ç which provides a curve of F as a function of X(see 7.2).
NOTE The curve gives additional information on the behaviour of the product and possibly enables the determination of the compression modulus of elasticity.
6 Test specimens.BS/EN 826-2013 pdf download.
BS/EN 826-2013 pdf download
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