ISO 15114:2014 specifies a method for the determination of mode II shear load delamination resistance. G_IIC, (critical energy release rate), of unidirectional fibre-reinforced plastic composites using the calibrated end-loaded split (C-ELS) test.

It is applicable to carbon-fibre and glass-fibre reinforced thermosets and thermoplastics.

The scope is not necessarily limited to these fibres and lay-ups, but for laminates with other types of fibres or lay-ups, no recommendations for specimen dimensions and fibre volume content are currently available.