In the framework of my work i have to load a SANDWICH under 4 bend points. mode of failure is unknown, for this reason I am testing to know which mode of failure occurs.

There are two standards:

ASTM D7249 Standard Test Method for Facing Properties of Sandwich Constructions by Long Beam Flexure

ASTM C393 Standard Test Method for Core Shear Properties of Sandwich Constructions by Beam Flexure What should I take for my experiment?

Thank you

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