Through the notch, a concentration of shear stress arises under deformation of the specimen, which ultimately leads to a break. Strain gages are placed at ±45° in the direction of the shear plane in order to determine the shear extension. Two variations of the method have been standardized:
- Iosipescu method to ASTM D5379
- V-notched rail shear method to ASTM D7078
There are also other methods used to characterize in-plane shear properties.