This test method must be used to determine the in-plane compression properties of polymer matrix composite materials reinforced with high modulus fibers. The composite material forms are limited to continuous-fibre or discontinuous-fibre reinforced composites for which the elastic properties are especially orthotropic with respect to the test direction. This test procedure introduces the compressive force into the specimen through shear at wedge grip interfaces.
Compressive Properties of Polymer Matrix Composite Materials by Shear Loading ASTM D3410 Test Scope:
By applying the compressive force into the specimen at wedge grip interfaces, this procedure establishes in-plane compressive characteristics. Although other materials may be tested, ASTM D3410 is best suited for composite materials reinforced by high-modulus fibers like tape and textiles. The test fixture is designed to apply a compressive load to the specimen's unsupported centre that measures 12 to 25 mm (0.5 to 1 inch) in length of the sample.
Specimens must have a constant rectangular cross section that is between 140 and 155 millimetres (5.5 to 6 inches) long. It is advised to use a width of either 12 mm (0.5 in) or 25 mm (1 in). Different thicknesses can be supported. To guarantee failure in the unsupported gauge length, tabs could be glued to the ends of the thin specimens.
ASTM D3410 Test Procedure:
Start by preparing rectangular cross sections with a maximum specimen thickness variation of 2% and a maximum specimen width variation of 1% as test specimens.
Center the specimen in the fixture between the grip interfaces. Ensure that when the fixture is closed, the whole grip length contacts the grip faces.
Attach the strain gauges to the specimen's mid-span and mid-width regions. Before beginning the test, confirm that the load reading is zero.
Until failure, apply the force at a uniform strain rate. The testing standard includes the recommended rates.
Ultimate compressive strength, ultimate compressive strain, compressive chord modulus of elasticity, compressive Poisson's ratio, and three-part failure identification codes are the compressive properties that were tested.
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