5.4.3.2 Test specimen
The test specimen shall confirm to all applicable
requirements. The specimen shall have a test span within 2% of being three
times its depth as tested. The sides of the specimen shall be at right angles
with the top and bottom. All surfaces in contact with load-applying and support
blocks shall be smooth and free of scars, indentations, holes or inscribed
identifications.
5.4.3.3 Procedure
First we turned the test specimen on
its side with respect to its position as molded and center on the bearing
blocks. The loading system is centered in relation to the applied force. Then
we brought the load applying blocks in contact with the surface of the specimen
at the third points between the supports. The load may be applied rapidly, up
to approximately 50% of the breaking load. Therefore the load is applied
continuously at a rate which constantly increases the extreme fiber stress,
until the rupture occurs.
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Fig No. 5.1: Beam specimen for flexure test.
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Fig No. 5.2: The failure pattern of beam after rupture.
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