BS EN 514-2000 pdf download.Unpiasticized polyvinylchloride (PVC-U) profiles for the fabrication of windows and doors — Determination of the strength of welded corners and T-joints.
This BS EN 514 specifies two test methods for the measurement of the failure load of welded corners and T-joints made from unpiasticized polyvinylchloride (PVC-U) profiles for the fabrication of windows and doors. From the failure load the failure stress is calculated.
2 Definitions
For the purposes of this European Standard, the following definition applies
2.1 failure load: That load at which yield occurs, or, if yield does not occur, the load at whicn
the test piece breaks.
3 Principle
Welded corners and T-joints made from unplasticized polyvinyichioride (PVC-U) profiles are subjected to a tensile bending or compression bending test at specified temperature and test speed.
The failure load is recorded and the failure stress is calculated.
4 Apparatus
4.1 Tensile or compression testing machine with the following specifications:
a) measuring range of load: 2 kN to 20 kN;
b) load indication with zero point setting and peak recording;
c) measurement accuracy: ± 3 %;
d) test speed: (50 ± 5) mm/min.
5 Test piece
5.1 Welding of the corner test piece
The test piece is a welded corner with an angle of (90 ± 1)
Two lengths of profile cut at 45 ° are heat welded.
5.2 Welding of the T-joint test piece
The test piece is a welded T-joint with an angle of (90 ± 1) O• The T-joint is fabricated by heat welding one piece of, for instance, sash or outer frame profile at least 500 mm long and one piece of, for instance, transom profile at least 400 mm long.
Before welding, the sash or outer frame profile is notched at 2 x 45 ° to a depth in accordance with the formula:
The transom profile end is sawn into a symmetrical 90 ° point.
The position of the 90 ° notch in the sash or frame profile is such as to leave a minimum 400 mm leg measured from the top of the transom profile (see figure 2).
NOTE: The document DVS 2207 Part 25 clauses 2 to 8 contain information about welding procedures which may be of relevance.
5.3 Tensile bending test piece
5.3.1 The inside leg length of the test piece for corner testing shall be at least 400 mm (see figure 1).
5.3.2 The T-joint test piece is fabricated with the sash or frame arms of inside length at least 400 mm and 100 mm, and the transom or mullion stem length at least 400 mm (see figure 2).
5.4 Compression bending test piece
5.4.1 The legs of the corner test piece are cut at an angle of (45 ± 1) ° in such a way that the neutral axes of the end sections are located vertically over the axes of rotation of the carriage (approximately the
middle of the main chamber of the profile) (see figure 3). The inside length of the legs Li in millimetres is obtained from the following formulae:
where:
L = the length of the neutral axis of the profile in millimetres;
e = the distance between the inside of the section and the neutral axis in millimetres.
5.4.2 The short arm of the T-joint test piece is cut off level with the outer face of the stem to produce a
90 ° corner. Further preparation of the corner is in accordance with 5.4.1 (see figure 4).
5.5 Number of test pieces
A minimum of three samples per profile type, all made on the same welder head, shall be tested to obtain a mean value.
6 Conditioning
The test pieces shall be conditioned at (23 ± 5) °C for at least two hours immediately prior to
testing.
7 Procedure
7.1 Test temperature
The test is carried out at a temperature of (23 ± 5) °C.
7.2 Tensile bending test
7.2.1 Clamp the test piece in the apparatus as shown in figures 1 or 2. Contoured support blocks
may be used, if necessary, to limit twisting.
7.2.2 Apply the load to the test piece in such a way that the speed of application is
50 mm/mm.
7.2.3 Continue until the test piece fails.
7.2.4 Note the failure load Ft and calculate the failure stress in accordance with annex A.
7.3 CompressIon bending test
7.3.1 Place the test piece on the trolley as shown in figures 3 or 4. In order to avoid excessive deflection, the open frame end of the T-joint can be supported in the corner area by inserting a cavity filling block (e.g. a piece of metal reinforcement or a wooden block).
7.3.2 Apply the load to the test piece in such a way that the speed of application is
50 mm/mm.
7.3.3 Continue until the test piece fails.
7.3.4 Note the failure load F and calculate the failure stress in accordance with annex A.BS EN 514-2000 pdf download.