Optimization of the buckling load of laminated plates subjected to transverse impact

• Grant number: 12/18365-2
• Support Opportunities: Scholarships in Brazil - Master
• Start date: January 01, 2013
• End date: August 31, 2013
• Field of knowledge: Engineering - Mechanical Engineering - Mechanics of Solids
• Principal Investigator: Sergio Frascino Muller de Almeida
• Grantee: Rubens Zolar Gehlen Bohrer
• Host Institution: Divisão de Engenharia Mecânica (IEM). Instituto Tecnológico de Aeronáutica (ITA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil

Abstract

The present project aim to develop optimization innovative techniques applied to aeronautical panels manufactured in composite material under simultaneous action of compressive and impact of small mass loads.The objective function is the maximization of the bending load of a panel with a certain number of plies under eventual degradation effects caused by impact loads. The project variables will be the stack lamination angles. The project data are: impact energy, impactor mass and radios and the number of laminas.Two approaches are proposed in order to characterize the panel degradation as a function of the impact load: (a) use a series of closed equations in order to estimate the peak load after the impact and the panel delamination initiation load; use these data to maximize the bending load before the panel delamination and (b) consider that the panel is entirely degraded on an area corresponding to the impactor radios with center on the impact point. The results of these optimizations will be compared in order to evaluate the best approach.The optimization will use an algorithm recently developed based on lamination parameters, a linear metamodel in terms of the laminations parameters and a data bank. This algorithm is already implemented and it was used to optimize similar problems.The project involves several innovative scientific contributions and has a great potential for practical applications on aeronautical projects of composites laminates. (AU)

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

GEHLEN ROHRER, RUBENS ZOLAR; MULLER DE ALMEIDA, SERGIO FRASCINO; DONADON, MAURICIO VICENTE. Optimization of composite plates subjected to buckling and small mass impact using lamination parameters. COMPOSITE STRUCTURES, v. 120, p. 141-152, FEB 2015. (12/18365-2, 08/57866-1, 06/61257-5)