Iosipescu Test Fixture GZ IS-20

The Iosipescu shear test fixture is designed specifically for testing shear properties of composite materials according to ASTM D5379 in universal testing machines. This shear test fixture is designed for quasi-static testing of composite materials with any fibre orientation as specified in the ASTM standard.

This shear test method is a non-symmetric loaded 4-point bending test. The specimen is applied into the test fixture and loaded by to profiles moving in a relative movement to each other. The loads are transferred via four contact areas into the specimen. A V-notch defines the area of failure in the specimen. The material stress in the specimen is a shear force with lateral components.

Although this method was not originally designed for composite materials and does offer some shortcoming, one of the advantages of the Iosipescu test is that it is a simple and easy to do test. Materials with single or multiple fibre orientations can be used with this test method.

Features & Benefits

  • Compact and very high quality test fixture for loads up to 20 kN
  • Test fixture for Iospiescu test according to ASTM D5379
  • Precise orientation and alignment of specimen using an integrated alignment device
  • Stainless steel design of all components for use in climate chambers (-60…+150 °C)


  • Adapter for connection to all common electromechanical and servo-hydraulic universal testing machines


  • ASTM D5379, “ Standard Test Method for Shear Properties of Composite Materials by the V-Notched Beam Method”, ASTM, 2012

Further Information