Impact wedge peel test

Adhesive, cohesive zone model, finite volume method, impact wedge peel test, TDCB. 

The thickness of the TDCB specimens (S = 10 mm) is sufficient to ensure plain strain conditions. It should be noted that during the test the arms remain within their elastic limit. Therefore, from simple beam theory [7], and by the use of linear elastic fracture mechanics, the strain energy release rate of the adhesive can be obtained using Eqn. 2, where P is the load at failure and E, is the substrate modulus. The calculated adhesive fracture energy was employed in the simulation of the TDCB and impact wedge-peel (IWP) tests. 

ISO 11343 wedge impact peel test specimen (From Blackman et al. [2000], copyright Kluwer)... 

Such a property is crucial in case of a sudden overload through an impact. In particular hard and brittle adhesives with very high strength (higher than 1,000 MPa G-modulus) fail under such loads very fast and these are not recommended for automotive applications where impact resistance is needed. The impact performance is tested with an impact peel tester shown in Fig. 46.11, where a weight on a pendulum drives a wedge through the specimen and the forces are recorded. 

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