ASTM D7078 - V-Notched Rail Shear Testing Method of CFRP

ASTM D7078 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
Shear Strength
Test 1 4.63 121.72
Test 2 4.55 120.00
Test 3 4.58 120.05
Mean 4.59 120.60

Shear Strain Distribution

ASTM D7078 Shear Strain Distribution

ASTM D7078 Specimen After Testing

ASTM D7078 Test Specimen

Recommended Products for ASTM D7078


For Research Use Only. Not for use in diagnostic procedures.

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