BS EN 6033:2015 pdf download.Aerospace series – Carbon fibre reinforced plastics – Test method – Determination of interlaminar fracture toughness energy – Mode I – GIC.
BS EN 6033 specifies the procedure to determine the mode I interlaminar fracture toughness energy Gic of carbon fibre composites manufactured from unidirectional tape or woven fabric.
This standard does not give any directions necessary to meet health and safety requirements. It is the responsibility of the user of this standard to consult and establish appropriate health and safet precautions.
2 Normative references
EN 2565, Aerospace series- Preparation of carbon fibre reinforced resin panels for test purposes.
EN 2743, Aerospace series-Fibre reinforced plastics-Standard procedures for conditioning prior to testing unaged materials.
4 Principle of the method
The precracked specimen is loaded continuously by peel-forces until a total propagated crack length of approximately 100 mm has been achieved During the crack propagation the loads and cross head displacement of the test machine will be recorded continuously. The interlaminar fracture toughness energy is calculated from the propagated crack length and the applied energy determined from the load cross head displacement diagram.
6 Apparatus
6.1 Tensile testing machine, accurate to within 1 % in the load range used.
The misalignment of the grip faces must be less than 0,05 mm at 300 mm separation, increasing by less better than 0, 1 mm per meter.
6.2 As tabs, bent aluminium strips of about 0, 5 mm – 0,7 mm thick or hinged metallic tabs of about 1,0 mm to 1,5 mm thickness shall be used as shown in Figure 1.
6.3 A slide caliper with an accuracy to the nearest 0,05 mm.
6.4 Release film e.g. PTFE (Polytetrafluorethylene )foil of about (0, 02 to 0,03) mm thickness
6.5 Microscope of magnification of 15-25.
7 Test specimen
7.1 Test specimen description
The dimensions of the specimens shall be in accordance with Figure 1. If fabric is used, the thickness shall be of the nearest to Figure 1. The fibre direction for tape material shall be at to the specimen length and at 0/90 for fabric material.
If the specification invoking the test also asks for Gnc-results according to EN 6034 from the same material, it is recommended to use the remainder of the laminate as a test specimen for Gic – test (see EN 6034 for specimen dimensions).
7. 2 Test specimen preparation
The test specimens shall be cut from flat laminates which have been processed in accordance with EN2565.BS EN 6033 pdf download.