At determination of strength at shift the following problem arises a three-point bend of ASTM B 2344. Samples of a GFRP and a CFRPc not always collapse from shift, and are sometimes rumpled. For fight against this phenomenon we have deviated the standard and have reduced the part of a sample out support. Destruction became shift, but absolute values of durability have fallen approximately twice. Whether there is an opinion that it is better for determination of durability at shift - to be guided by the standard or to aspire to the correct mechanism of destruction.?
Hi Petr,
Please tell me more about the composition of your composite materials and the test specimen sizes as well please. From the images it looks like a very thick specimen for the test which may not giving you the expected results. another thing- are you doing 3 point bend test to find out the durability of the composites?
Kind regards
Shohel
Dear Sir,
what is the span to thickness ratio? Which test are you performing : a) Short beam shear or b) Flexural strength. Also i could not understand the meaning of 'shift'. could you please clear matter
Foe short beam shear ASTM D2344 used.
what is dimension of specimen you used.
The problem is that when using ASTM instead of GOST you overestimate value of shift strength!
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