M Naghinejad - PhD student, Aerospace Engineering Department and Center of Excellence in Computational Aerospace Engineering,Amirkabir University of Technology, Tehran ۱۵۸۷۵-۴۴۱۳, Iran
H.R. Ovesy - Professor, Aerospace Engineering Department and Center of Excellence in Computational Aerospace Engineering, AmirkabirUniversity of Technology, Tehran ۱۵۸۷۵-۴۴۱۳, Iran

The variational principle coupled with a Griffith-type fracture criterion is used to analyze the evolution of delamination growth speed of a thin film delamination model in a thick base laminate under in-plane loadings. Abuckled composite laminate with through-the-width delamination and clamped edges has been considered. Equations of motion and the local growth condition at the crack tip formed coupled ordinary differential equations and thensolved using fourth order Runge-Kutta method. The results have been investigated and discussed for different parameters.

Speed of delamination growth, variational principle, composite materials, buckled laminate