in this paper a new method for nondestructive testing or nondestructive evaluation is proposed for glass-epoxy composite. for this purpose, impact-echo is used to evaluate the properties of composite materials, detecting internal defects and thickness measurement. in the impact-echo method a steel ball impacts on a composite plate and generates stress waves or p-waves which will be transferred ...

We present a novel mathematical model to investigate the extraction of wave power by flexible elastic floaters. The is based on method dry modes, coupled with matched eigenfunction expansion. Our results compare satisfactorily preliminary data obtained from demonstrator device, developed at University Groningen. show that role elasticity increase number resonant frequencies respect rigid body, ...

In this work we derive by $\Gamma$ -convergence techniques a model for brittle fracture linearly elastic plates. Precisely, start from thin film with positive thickness $\rho$ and study the limit as tends to $0$ . The analysis is performed no priori restrictions on admissible displacements geometry of set. characterized Kirchhoff-Love type structure.

A numerical model is developed to simulate the transport phenomena in the flow channel between parallel plates with porous and non-porous (or impermeable) walls. The continuity and momentum equations were solved first, assuming the wall Reynolds number in the range of with the suction or injection of air at a speed equal to the uniform inlet velocity. The results show that at constant inlet and...