ASTM C 394 (C-394) determines the effect of repeated shear loads on sandwich core materials. These test methods provide a standard method of obtaining the sandwich core shear fatigue properties. Usually the most critical stress to which a sandwich panel core is subjected is shear. The effect of repeated shear stresses on the core material can be very important. ASTM C394 uses the same test fixture as the present ASTM C273 standard. However, the core material is to be tested without face sheets. That is, the core is bonded directly to the bonding plates.

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