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Quite simply, we start where you are, and provide as much or as little help as you need. And Why Not..? Type 1 B shall not be used for multidirectional, continuous-fibre- reinforced matenals. Type 2 rectangular without end tabs and type 3 rectangular with bonded end tabs are for testing fibre-reinforced thermosets and thermoplastics.
Specimens with unbonded end tabs are considered as type 2. The preferred width of type 2 and type 3 specimens is 25 mm, but widths of 50 mm or greater may be used if the tensile strength is low due to the particular type of reinforcement used.
NOTE — The four-point loading geometry provides a constant bending moment between the central loading members. The compressive contact stresses due to the two central loading members are lower in comparison with the stresses induced under the single loading member of the three-point test.
The four-point geometry is chosen so that the centre span equals one-third of the outer span. The distance between the outer support points is the same as in the equivalent three-point loading case, therefore the same specimen can be used. Fibre-reinforced plastic composites. The definition of the Keq parameter offers the possibility to compare ceramic matrix composite materials with other materials with respect to sensitivity to crack propagation. For notch insensitive materials, the concept of Keq does not apply.
This International Standard applies to all ceramic matrix composites with a continuous fibre reinforcement, unidirectional 1 D , bidirectional 2 D , and tridirectional x D, where 2 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies.
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