Abstract
Laminated composite shell structures are becoming increasingly popular because of good stiffness/ strength to weight properties. The matrix material bonding the fibres together is weak compared to the reinforcing fibres, and laminated composite structures thus can fail because of delamination due to high transverse stress levels. In this work the objective is to optimize laminated composite structures against delamination failure. Due to many material layers in laminates, it is necessary to reduce the number of degrees of freedom in finite element models by use of Equivalent Single Layer (ESL) elements, to be able to describe the global response of laminated shell structures. When doing so information about the detailed response of the laminate is lost and it is not possible to predict delamination failure accurately. Adaptively refined analysis models are introduced to overcome this issue.
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