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ASTM D7078 - V-Notched Rail Shear Testing Method of CFRP
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ASTM D7078 (Standard Test Method for Shear Properties of Composite Materials by V-Notched Rail Shear Method) is a V-notched rail shear testing method that is widely used to determine the in-plane shear characteristics of composite materials. This method uses a sample without holes with a large gauge section and can accommodate CFRPs with discontinuous fibers.
Shear strain can be calculated using the AGX Series, TRAPEZIUM X Series software and an ASTM D7078 test jig. For this test, two strain gauges were attached at the midpoint between the V notches in order to measure strain in -45° and +45° directions. The equipment configuration is shown in Table 1. Table 2 shows that the test results are highly reproducible.
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Table 1: ASTM D7078 Test Conditions
Testing Machine AGX Series Load Cell 50 kN Test Jig ASTM D7078 Jig Software TRAPEZIUM X Series (Single) Test Speed 2 mm/min -
Table 2: ASTM D7078 Test Results
Specimen Shear Modulus
(GPa)Shear Strength
(MPa)Test 1 4.63 121.72 Test 2 4.55 120.00 Test 3 4.58 120.05 Mean 4.59 120.60
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ASTM D7078 Specimen Shear Strain Distribution
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ASTM D7078 Specimen After Testing
