ASTM D6641 | Composites | Compression Testing
ASTM D6641 is a testing specification that determines the compressive strength and stiffness of polymer matrix composite materials using a combined loading compression (CLC) test fixture. This test procedure introduces the compressive force into the specimen through combined shear end loading.
ASTM D6641 includes two procedures; Procedure A: to be used with untabbed specimens such as fabrics, chopped fiber composites, laminates with a maximum of 50% 0˚ plies and Procedure B: to be used with tabbed specimens with a higher orthotropy such as unidirectional composites. The use of tabs is necessary to increase the load-bearing area at the specimen ends. Before conducting ASTM D6641, it is important to read the entire specification in the relevant ASTM publication.
ASTM D6641 | Composites | Compression Testing
- Use cutting tools to carve the fabric into a rectangular shape. The longer side should be parallel to the direction that is to be tested. Drawing a line down the long segment of the textile will ease the alignment of the sample into the grips.
- Once the specimen is prepared, load and secure it into a pair of clamps. A Manual Vise grip would be the most appropriate fixture for this testing standard.
- Start moving the grips apart at the specified rate.
- Stop the test once the specimen breaks or ruptures.
- Laminate Compressive Strength
- Laminate Compressive Modulus
- Compressive Poisson’s Ratio
ASTM D6641 | Composites | Compression Testing
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