BS EN 12814-2:2021 pdf free download – Testing of welded joints of thermoplastics semi-finished products Part 2: Tensile test.
This document specifies the dimensions, the method of sampling, the preparation of the test specimens and the conditions for performing the tensile test in order to determine the short-term tensile welding factor.
A tensile test can be used in conjunction with other tests (e.g. bend, tensile creep, macro) to assess the performance of welded assemblies, made from thermoplastics materials.
The test is applicable to welded semi-finished products made from thermoplastics materials filled or unfilled, but not reinforced, irrespective of the welding process used.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
EN 13100-1, Non destructive testing of welded joints of thermoplastics semi-finished products – Part 1: Visual examination
EN ISO 52 7-1, Plastics – Determination of tensile properties – Part 1: General principles (150 527-1)
ISO 5893, Rubber and plastics test equipment – Tensile, flexural and compression types (constant rate of traverse) – Specification
ISO 13953, Polyethylene (PE) pipes and fittings – Determinationof the tensile strength of test specimens from a butt-fused joint
3 Terms, definitions, symbols and abbreviated terms
3.1 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.2 Symbols and abbreviated terms
For the purposes of this document, the symbols and abbreviated terms given in Table 1 apply.
6 Dimensions of test specimens
For tubes of nominal outside diameter Dn less than 20 mm, the whole tube shall be tested and the minimum distance between the clamps shall be 200 mm.
The dimensions of test specimens are given in Table 2 and Table 3.
Where the beads are left intact in service, they shall be left intact for the test. Where the beads are removed
in service, they shall be removed prior to testing.
The tolerance for b shall be土1 mm and the minimum value shall be 6 mm. The tolerance for Lo shall be土2mm.
The variation of b over the length Lo shall not exceed土2 % of the average value of b.
The forms of the test specimens are given in Figure 1 and Figure 2.
For overlap joints, the dimensions and form of the test specimens are given in Annex A.
In order to determine a short-term tensile welding factor for overlap joints, the test specimen geometry used is described in Figure A.1 and Table A.1.
The values of fs determined using this specimen geometry should not be correlated with the values of is determined using the type 1 or type 2 test specimens described in Clause 6.