ASTM C393 Sandwich Constructions Shear Testing by Beam Flexure
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ASTM C393 | Sandwich Constructions | Shear Testing

ASTM C393 is a test method designed to determine the core shear properties of sandwich constructions. The shear properties are determined via a bend test in a 3- or 4-point loading condition. This test standard requires a very unique articulating bend fixture with pressure pads to help provide the most accurate and consistent core shear results possible, even with the sometimes difficult to control process of manufacturing sandwich constructions.

Before conducting ASTM C393, it is important to read the entire specification in the relevant ASTM publication.

ASTM C393 | Sandwich Constructions | Shear Testing

  1. Prepare the test specimens as described in the test method.
  2. Depending on your requirements and expected results, select the appropriate bending condition (3-point vs. 4-point options) and configure the bend fixture accordingly. Care should be taken to modify the bend fixture pads, as necessary based on specimen construction, to try and prevent core crushing or facing panel failures during test.
  3. Insert and carefully align the test specimen within the fixture.
  4. Apply a compressive load to the specimen using a constant rate of displacement according to the standard. Record the force and deflection data.
  5. Continue the application of force until the specimen fails, or the deflection is equal to the specimen thickness.
Calculations:
  • Core Shear Ultimate Strength
  • Core Shear Yield Stress
  • Facing (Bending) Stress

ASTM C393 | Sandwich Constructions | Shear Testing

ASTM C393 Recommended Equipment
Testing System
Fixturing
  • Special Articulating Bend Fixture (3 or 4 point) for ASTM C393
  • Deflectometer (if required)
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