Colloquium: Raffaele Russo (ASM)

29 mei 2018 13:30 - Locatie: Lecture room F, Faculty of Aerospace Engineering, Kluyverweg 1, Delft.

HIGH ORDER ADAPTIVELY INTEGRATED COHESIVE ELEMENTS

Composite delamination represents one of the most critical failure mechanisms occurring in composite structures. Predicting delamination through analytical models is possible for simple structures, but the same is not true in case complex composite structures are being analysed; numerical methods, in facts, need to be employed. One of the methods to numerically simulate delamination in a Finite Element environment is through the Cohesive Zone Model, which can be implemented in a numerical solver by mean of the Cohesive Elements. Nonetheless, the computational time required to assess such simulations is restrictive, because the presence of a strong stress gradient at the crack tip imposes the employment of a small-size mesh at the same location. A novel type of Cohesive Element is here proposed, aiming to loosen the compelling requirement on the mesh size, by extension, reducing the computational time currently required to numerically simulate delamination.