BS EN 6034:2015 pdf download.Aerospace series – Carbon fibre reinforced plastics – Test method – Determination of interlaminar fracture toughness energy – Mode II – GIIC.
BS EN 6034 specifies the procedure to determine the mode II interlaminar fracture toughness energy Guc of carbon fibre composites manufactured from unidirectional tape or woven fabric.
BS EN 6034 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 safety precautions.
4 Principle of the method
The end notched flexure specimen is used for mode Il testing. A precracked specimen is loaded in a three point bend fixture (see Figure 2 ) until crack propagation onset. The load applied to the specimen and the cross head displacement of the test machine are recorded continuously during the test. The total fracture toughness energy is calculated from the initial crack length and load-displacement diagram.
8 Procedure
8.1 Conditioning
If not otherwise defined by the specification invoking the test, specimens to be tested dry or in the as cured state, should first be conditioned at (23 ± 2) °C, (50 ± 5) % RH in accordance with EN 2743, same requirements to be applied to perform room temperature testing.
Aged specimens shall be tested directly after ageing procedure (a maximum storage of 8 h at (23 ± 2) °C is allowed before testing).
8.2 Determination of dimensions
The width and length of the specimens shall be measured using a vernier caliper (see 6.3).
A minimum of three thickness measurements distributed over the specimen shall be made using a flat face micrometer (see 6.4), the average shall be recorded.
8.4 Elevated and sub-zero temperature tests
If not otherwise defined by the specification invoking the test, apply a thermocouple on the specimen as close as possible to cracked area of the specimen and seal the thermocouple from the surrounding air by using vacuum bag sealant.
The soak time at test temperature, defined by the specification invoking the test, shall be (5 ± 0,5) mm for dry specimens and in accordance with EN 2823 for conditioned specimen.
If more then one determination is provided for, wait for crack stabilization under load and mark the current tip location on the painted sides of the specimen.
Unload the specimen to zero.
The complete procedure shall be repeated for the subsequent determinations when needed.
Unless otherwise specified, the remaining uncracked portion of the specimen shall be delaminated after removal from the test fixture (cooling the specimen down to liquid nitrogen temperature will facilitate this operation).BS EN 6034 pdf download.
BS EN 6034:2015 pdf download
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