Elastic-Plastic Properties of Structural Adhesive Systems

Elastic-Plastic Properties of Structural Adhesive Systems 

At 70 °C, both systems are above Tg and behave hke rubbery materials. No permanent strain exists after fracture. At temperatures above Tg, viscous flow is hindered due to crosslinking. However, chain segments remain flexible and the adhesive can withstand high strains. Although these strains are not as high as in a mbber, they can no longer be considered small . Hence, a hyperelastic material model must be used. The second system (Fig. 33.2, right) already shows hyperelastic properties at 23 °C due to the low strain rate. 

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