Abstract: Effects of aspect ratio, sweep angle, and stacking sequence of laminated composites were studied to find the optimized configuration of an aeroelastically tailored composite wing idealized as a flat plate in terms of flutter speed. The aeroelastic analysis has been carried out in frequency-domain. The 2D finite element analysis in conjunction with Doublet-lattice Method (DLM) has been...

ABSTRAC~ This paper deals witU a new 48-degrees-of-freedom rectangular finite element for analysing moderately thi(:k, multilayered composite plates. The formulation is based on a kinematics which allows one to exactly ensure the continuity <londitions for the displacements, and the t~ansverse str~sses at the interfaces between the layers of a laminated structure and zero s1lress conditiQns at ...

Due to the presence of through-thickness reinforcement, 3D woven composites have superior fracture toughness, fatigue life, and damage tolerance compared to laminated composites. Furthermore, 3D woven composites exhibit a progressive damage behavior which is more benign than the typical catastrophic failure behavior of laminated composites. These properties lead to high specific energy absorpti...

Three methods for the damage localization of impact damage in laminated composite plates, based on their vibrational characteristics, are presented in this paper. These methods use double pulse TV holography with acoustic excitation for mode shapes acquisition and the differences in translations, rotations and curvatures. The rotations and curvatures are obtained by numerical differentiation of...

A genetic algorithm (GA) was adopted to optimise the response of a composite laminate subject to impact. Two different impact scenarios are presented: low-velocity impact of a slender laminated strip and high-velocity impact of a rectangular plate by a spherical impactor. In these cases, the GA’s objective was to, respectively, minimise the peak deflection and minimise penetration by varying th...

Evolutionary computation techniques have been receiving increasing attention regarding their potential as optimization techniques for complex problems. Recently these techniques were applied in the area of industrial engineering; the most-known applications include scheduling and sequencing in manufacturing systems, computer-aided design, facility layout and location problems, distribution and ...

1. ABSTRACT X-ray diffraction (XRD) measurements have been made to determine residual stresses in embedded Al particles placed between the first and second ply of both unidirectional and fabric graphite/PMR-15 composite specimens. In order to further verify the results obtained, the effect of externally applied four-point bending on the measured strains and stresses in the Al inclusions was inv...

In this study, design and application of a structural health monitoring (SHM) in composite materials with fiber bragg grating (FGB) sensors are investigated. The designed structure consists laminated material that was produced by vacuum infusion method. specimen obtained embedding FGB sensor between the 12-layer glass layers. Moreover, SHM achieved obtaining strain data from embedded material. ...

This paper reports numerical analyses of free vibration of laminated composite plate/ shell structures of various shapes, span-to-thickness ratios, boundary conditions and lay-up sequences. The method is based on a novel four-node quadrilateral element, namely MISQ20, within the framework of the first-order shear deformation theory (FSDT). The element is built by incorporating a strain smoothin...

Trapezoidal laminated plates with cutouts are commonly found in many engineering field, especially aerospace structures. In cases these subjected to various harsh environmental conditions during its service life. Thermally induced load is the one which seriously affect buckling characteristics of structural components. The study presents effect rise temperature on thermal trapezoidal composite ...