ASTM D5379

ASTM D5379: Standard Test Method for Shear Properties of Composite Materials by the V-Notched Beam Method (Iosepescu)

This test is used to determine the shear properties of composite materials reinforced with high-modulus fibers.  This method is also particular to discontinuous and continuous fiber composites with only material forms that are specified in the standard.

After conditioning and machining the specimen according to the standard, strain gauges must be applied in a very specific fashion to ensure proper readings.  The two strain gauges also ensure that there is no specimen twisting through analysis of the test data.  The load is applied by the universal testing machine until failure occurs.

Shear stress, ultimate strength, shears strain, ultimate strain, and shear cord modulus of elasticity.

Test frame, IOSEPESCU Shear Test Fixture, two strain gauges, test method software