Hi,

For the mentioned material you should follow the ASTM standard test method D790. 

According to this standard your support span should AT LEAST be 16 times the depth of your specimens, and you need AT LEAST 10% of your support span as over hang on each side.

Please note that there is a reason behind mentioned minimum length. If your test specimens are shorter than this length, then the failure you get is not purely due to bending momonet and it could be due to shear force in your beam.  Consequently, the maximum stress you get would be interlaminar shear strength instead of maximum flexural strength.

Ariande has attached the ASTM D790 for you. Please let me know if you had any more question about this procedure.

Regards,

Ali Amiri

Hi,

For the mentioned material you should follow the ASTM standard test method D790. 

According to this standard your support span should AT LEAST be 16 times the depth of your specimens, and you need AT LEAST 10% of your support span as over hang on each side.

Please note that there is a reason behind mentioned minimum length. If your test specimens are shorter than this length, then the failure you get is not purely due to bending momonet and it could be due to shear force in your beam.  Consequently, the maximum stress you get would be interlaminar shear strength instead of maximum flexural strength.

Ariande has attached the ASTM D790 for you. Please let me know if you had any more question about this procedure.

Regards,

Ali Amiri

Thank you dear Tsambani for your attention to my question and also for the attachments

Thank you dear Ali

I read some of the attached file of Tsambani

  but, there remains a problemen concerning the  speciemn width

6 mm in width is acceptable for three points bending or not?

HI,

You are welcome!

The dimensions of your specimen all depend on the thickness of your plate that you are cutting your specimens out of. If you refer to section 7.2 of the mentioned ASTM, depending on your thickness ( either less that 1.6 mm or greater than 1.6 mm ) you should be able to find the right dimensions. Rule of thumb, I always consider W

Dear Belouadah Zouheyr,

You can also follow ISO 178 "Determination of flexural properties" for your test. According to this standard, preferred specimen dimensions have been defined as follows:

Length: 80 +/- 2

Width: 10.0 +/- 2

Thickness;4.0 +/- 2, all in mm.

If it is not desirable to use the preferred specimen type, the ratio of the length and the thickness shall be l/h=20 +/- 1 for the reason Mr Ali Amiri has mentioned earlier.

Other vital facts worth considering for the flexural test are the radius of the supports and loading edge employed in the test machine. They are dependent on the thickness of your specimen though.

Regards,

Thank you dear Mehmet Cihan

Hello

Dear Belouadah Zouheyr,

You can use ASTM D790 standard to cut the samples

may you'll find useful info in this paper

Bests Regards,

Amine

Thank you dear Amine

Amine Rezzoug Hello, Can you let me the paper you were addressing?

BELOUADAH Zouheyr Ali Amiri can you tell me which section should I use for specimen dimensions in ASTM D790, section 7.4 or 7.5 or 7.2 or 7.3?

Thank you

Madhu,

it depends on your specimen thickness. Section 7.2 is the right place to go and based on your thickness you should be able to find the right dimension. Please check my answer earlier on this thread.

Hi

You can use of ASTM D-790

Plz send Flexural Test Specimen Size ASTM D790

I need ASTM D790. Can anyone please provide?