Abstract The present research proposes an applicable and impressive analytical model of Aircraft Engine Cowl (AEC) due to auspicate its frequency parameter. For the first time, the authors configured the structure of AEC by joining two well-known shapes of shell, including elliptical and conical. This procedure is implemented by obtaining the governing motion organization of differential equations affiliated with the Joined Elliptical-Conical Shells (JECS) in line with first-order shear deformation theory (FSDT) and General Shell Formulation (GSF). Moreover, Functionally Graded Materials (FGMs) with various spreading forms along the structure’s thickness are used to enhance the dynamic performance of AEC. It is worth mentioning that the recognized Rule of Mixture (RM) is engaged for achieving the equivalent mechanical characteristics of FGM. Finally, a well-known semi-analytical Generalized Differential Quadrature (GDQ) procedure is hired to extract the resulting system of motion equations to access the free vibration responses of AEC with diverse Boundary Conditions (BCs). It is worth mentioning that an applicable and interesting numerical model is done to inspect the remnants of geometric and material features on the oscillation demeanor of AEC structures. It will be verified that the projected procedure can be helpful for AEC’s vibration analysis and extendable for other types of studies to predict the AEC structure's static and dynamic treatment.

On vibrational-based numerical simulation of a jet engine cowl shell-like structure

Efficient numerical evaluation of transmission loss in homogenized acoustic metamaterials for aeronautical application

The formulation of the nth-order shear deformation theory was modified to discuss the hygrothermal response of free vibration of laminated composite plates. Current theory has four unknown variable...

Hygrothermal environmental effect on free vibration of laminated plates using nth-order shear deformation theory

Enhancement of the structural elements’ stiffness as well as reducing their weight can be made possible by arranging nanocomposites in an auxetic form. Motivated by this reality, this work undergoes with the postbuckling characteristics of thin beams made from auxetic carbon nanotube-reinforced nanocomposites for the first time. A bi-stage micromechanical homogenization technique is implemented to attain the effective modulus of such meta-nanocomposites. In this method, the effects of CNT agglomerates on the modulus estimation will be captured. Next, the von Karman strain–displacement relations will be hired as well as Euler–Bernoulli beam theory to find the nonlinear strain of the continuous system. Using the principle of virtual work, the nonlinear governing equation of the problem will be gathered. Then, Galerkin’s analytical method will be employed to find the nonlinear buckling load of the auxetic nanocomposite beams with simply supported and clamped ends. After proving the validity of the presented modeling, illustrative case studies are provided for reference. The highlights of this article indicate on the fact that the meta-nanocomposite beam will be strengthened against buckling-mode failure if small auxeticity angles are selected. Also, it is demonstrated that the structure fails under smaller buckling loads if a wide auxetic lattice is employed. Furthermore, it is shown that how can the buckling resistance of the auxetic nanocomposite beam be affected by the agglomeration phenomenon.

Postbuckling analysis of meta-nanocomposite beams by considering the CNTs’ agglomeration

This paper presents the static and mechanical buckling analyses of thick functionally graded (FG) plates. For this purpose, Carrera’s unified formulation (CUF) and the principle of virtual displace...

Application of Carrera unified formulation in conjunction with finite strip method in static and stability analysis of functionally graded plates

This work focuses on the assessment of a novel so-called “homogenization method” allowing to transform a heterogeneous material with inclusions or holes into an equivalent homogeneous material with...

Caroline Houriet

Papers

Homogenization and free-vibration analysis of elastic metamaterial plates by Carrera Unified Formulation finite elements