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Compressive Properties of Unidirectional Polymer Matrix Composites Using a Sandwich Beam ASTM D5467

ASTM D5467

Compressive Properties of Unidirectional Polymer Matrix Composites Using a Sandwich Beam ASTM D5467

The test method ASTM D5467 evaluates the compressive performance of the membrane skin material of a sandwich beam of polymer matrix composites. The test applies a compressive load to the upper skin using a four point flexural loading system. The skin material is limited to unidirectional continuous fiber composites. The core material is aluminum honeycomb and the opposite skin is either aluminum sheet or the same as the test material. The function of the core and the opposite skin is to induce the appropriate compressive loading in the test skin. Determination of strain and modulus, if desired, requires the use of strain gauges bonded to the face of the test skin.

To avoid local crushing of the sandwich specimen, the loads from the supports and the noses should be applied through large diameter cylinders (up to 1.5 times the sandwich thickness). Loading pads may also be necessary between the cylinders and the beam.

Test Procedure:
The components of the sandwich beam are bonded, either individual samples or a larger panel to be machined to size. If strain or modulus measurements are needed, mount a strain gauge in the center of the test skin per the manufacturer recommendations. Center the test specimen in the four point bending fixture, and test the specimen to failure. The test speed should produce failure in 1 to 10 minutes a suggested standard speed is 1.5 mm/min (0.05 in/min). A three part failure identification code is used to document the mode and location of failure for each specimen.

Specimen size:
Specimen dimensions are chosen to insure that the proper compressive loading is applied to the upper skin material however, differences in test geometry can have significant effects on the test results. ASTM D5467 provides two recommended specimen geometries depending upon the orientation of the continuous fiber reinforcement:
Fiber Orientation 0 90
Specimen Width 25mm 25mm
Specimen Length 550mm 205mm
Core Material Thickness 40mm 13mm
Thickness of Test Skin 0.8mm 1.2mm
Thickness of the Opposite Skin 1.6mm 1.6mm

Three part failure identification codes
Compressive Strength (stress at which the test facesheet fails in compression)
Ultimate Compressive Strain (from strain gauge data)
Compressive Chord Modulus of Elasticity (from strain gauge data)
Transition Strain (from strain gauge data)

Equipment Used:
Universal Testing Machine
Compression Test Fixture
Strain Gauges

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**Please note that this test description is intentionally generic in nature and aimed at providing a descriptive summary to enhance test understanding. For more information please contact a Intertek PTL Technical Representative at . Due to copyright restrictions, we are not able to provide copies of standards. Standards can be obtained from appropriate standards authorities.

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