is there any other experimental method to determine the bending rigidity and shear stiffness of a sandwich (three-point bending test) outside Allen's method?
Allens method is described in his book "Analysis and Design of Structural Sandwich Panels" on page 258
Thank you
Dear Zouhir
three-point bending test is the simplest way to find flexural (bending) stiffness of a sample because it is applicable to carry out by a tensile apparatus. and it is not using to derive shear stiffness.
Thanks for the answer.
I have tested according to ASTM C393 standard.
I have obtained bending stiffness and shear stiffness from the Software that is connected to the machine.
But software only determined this according to the formula.
formula is:
D= (E1*b* (d^3-c^3)/12
Dear Zouhir, you write "But software only determined this according to the formula.
formula is: D= (E1*b* (d^3-c^3)/12"
Yes, this formula is commonly used for determination of bending stiffness of bars made of homogenious materials. Are you want to find analogical analytical dependence for determination of bending stiffness of sandwich bars as well for determination of shear stiffness of sandwich bars?
As for experimental technique, I agree with Pouyan Ghabezi that three-point bending test is the simplest way to find flexural (bending) stiffness of a sample.
Good luck,
Serge
Thank you very much
so I just have to configure in software to get the bending stiffness
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