Is there any other experimental method to determine the bending rigidity of a sandwich?

[melixman2016]

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

 

[SWComposites]

See ASTM D7250

 

[melixman2016]

Thank you very much
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