scholarly journals A New Exponential Plate Theory for Laminated Composites under Cylindrical Bending

2003 ◽  
Vol 46 (152) ◽  
pp. 89-95 ◽  
Author(s):  
Jungsun Park ◽  
Soo-Yong Lee
Keyword(s):  
Plate Theory ◽  
Laminated Composites ◽  
Cylindrical Bending

An efficient higher-order plate theory for laminated composites

1992 ◽  
Vol 20 (2) ◽  
pp. 113-123 ◽  
Author(s):  
Maenghyo Cho ◽  
R.Reid Parmerter
Keyword(s):  
Plate Theory ◽  
Laminated Composites ◽  
Higher Order

Stress-Strain Analysis of a Taper-Taper Adhesive-Bonded Joint Under Cylindrical Bending

1999 ◽  
Vol 121 (3) ◽  
pp. 374-380 ◽  
Author(s):  
Jack E. Helms ◽  
Chihdar Yang ◽  
Su-Seng Pang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Analytical Model ◽  
Plate Theory ◽  
Element Model ◽  
Variable Coefficients ◽  
Fortran Program ◽  
Cylindrical Bending ◽  
First Order ◽  
Bonded Joint

A model of a taper-taper adhesive-bonded joint under cylindrical bending has been derived using first-order laminated plate theory. Shear correction factors were used to account for transverse shear deformation. A FORTRAN program was written to integrate the resulting system of twelve simultaneous, linear, first-order, differential equations with variable coefficients. The Linear Shooting Method was used to solve the model. A finite element model was developed using the COSMOS/M commercial finite element package to verify the analytical model for a cross-ply laminate. The analytical model results agreed well with the finite element models and predicted peak adhesive stresses within about 2% of the finite element model.

An Analytical Solution for Nonlinear Cylindrical Bending of Functionally Graded Plates

2006 ◽  
Author(s):  
H. M. Navazi ◽  
H. Haddadpour ◽  
M. Rasekh
Keyword(s):  
Material Properties ◽  
Plate Theory ◽  
Nonlinear Boundary Conditions ◽  
Solution Procedure ◽  
Functionally Graded ◽  
Functionally Graded Plates ◽  
Power Law Distribution ◽  
Equilibrium Equations ◽  
Cylindrical Bending ◽  
Linear Differential

In this paper, the nonlinear cylindrical bending of a functionally graded plate is studied. The material properties of the plate are assumed to be graded continuously in the direction of thickness. The variation of the material properties follows a simple power-law distribution in terms of the volume fractions of constituents. The von Karman strains are used to construct the nonlinear equilibrium equations of the plates subjected to in-plane and transverse loadings. The governing equations are reduced to linear differential equation with nonlinear boundary conditions yielding a simple solution procedure. The results show that the functionally graded plates exhibit different behavior from plates made of pure materials in cylindrical bending. Also, it is shown that the linear plate theory is inadequate for analysis of FG plate even in the small deflection range.

Self-Folding Laminated Composites for Smart Origami Structures

2015 ◽  
Author(s):  
Venkata Siva C. Chillara ◽  
Leon M. Headings ◽  
Marcelo J. Dapino
Keyword(s):  
Smart Materials ◽  
Plate Theory ◽  
Laminated Composites ◽  
Model Development ◽  
Laminate Plate ◽  
Core Layer ◽  
Lightweight Structures ◽  
Flat Shape ◽  
Core Thickness ◽  
Development And Validation

Origami-folding principles can be used with laminated composites to produce lightweight structures that are capable of drastic changes in shape. This paper presents a smart composite that can actively change its crease pattern to fold itself into different rigid shapes and provide a large range of motion. The composite uses a smart material with variable modulus sandwiched between two fiber-reinforced elastomeric skins, one of which is prestressed. Change in modulus of the sandwiched core layer allows prestress in the elastomeric skin to actuate the fold. Unfolding the structure to a flat shape can be accomplished through either embedded or external actuation. Passive composite panels were fabricated for model development and validation. An analytical model was developed based on classical laminate plate theory to study the influence of core modulus, core thickness, and elastomeric skin prestress on the equilibrium curvature of the composite structure. Selected smart materials that provide a change in modulus when stimulated are discussed as candidates for the core layer of the self-folding composite.

scholarly journals Effect of Angle Ply On The Mechanical Performance of Jute Fibre Woven Mat /Epoxy Composites With Varying Ageing Conditions

2021 ◽  
Author(s):  
Satheeshkumar S. ◽  
Sathishkumar T. P ◽  
Rajini Nagarajan ◽  
Navaneethakrishnan P. ◽  
Sikiru O. Ismail ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Mechanical Performance ◽  
Plate Theory ◽  
Laminated Composites ◽  
Low Cost ◽  
Laminated Plate ◽  
Maximum Activation ◽  
Mechanical Strengths ◽  
Strength Retention ◽  
Composite Samples

Abstract The present work investigates the mechanical strengths retention and prediction of maximum service life of sets of laminated composites by analyzing their diffusion coefficients and activation energies, using Fick’s law and Arrhenius principle. Jute fiber woven mat reinforced epoxy laminated composites (JFMRLCs) were prepared by simple hand lay-up and compression molding methods. The layering patterns of 0º balanced laminate of [0º/0º/0º/0º/0º], 30º angle-ply laminate of [0º/+30º/0º/-30º/0º] and 45° angle-ply laminate of [0°/+45°/0°/-45°/0°] were used to prepare the composite samples, according to classical laminated plate theory (CLPT). The composites were immersed in water at different periods of 10, 20, 30 and 40 days aging. The effects of the various periods of aging on their mechanical properties were studied. The results showed that the weights of the composite samples increased by increasing the aging periods. The mechanical properties of aged (wet) composites were compared with the unaged (dry) counterparts to predict their strengths retention. The composite with 45° layering pattern exhibited the maximum strength retention. Also, the same composite sample with layering pattern of 45° produced the maximum activation energy, based on Arrhenius principle. The tensile fractured surfaces were analyzed to investigate into their fiber-matrix interfacial bonds through images obtained from scanning electron microscopy (SEM). Summarily, it was evident that optimum JFMRLCs with layering pattern of 45° exhibited best mechanical properties. Hence, they can act as suitable, sustainable, low cost and environmentally friendly composite materials for structural marine and other related engineering applications.

Topology optimization of compliant mechanisms with curvilinear fiber path laminated composites

2016 ◽  
Vol 230 (17) ◽  
pp. 3101-3110 ◽  
Author(s):  
Xinxing Tong ◽  
Wenjie Ge ◽  
Yonghong Zhang
Keyword(s):  
Topology Optimization ◽  
Strain Energy ◽  
Compliant Mechanisms ◽  
Plate Theory ◽  
Laminated Composites ◽  
Optimality Criteria ◽  
Constitutive Relationship ◽  
Laminated Plate ◽  
Topology Optimization Problem ◽  
Fiber Path

An approach for designing compliant mechanisms with curvilinear fiber path laminated composites is presented to obtain the optimum topology structure in this paper. A laminated plate with curvilinear fiber path is built by using the shifted fiber path method. Meanwhile, an equivalent constitutive relationship of the laminated plate has been obtained based on the laminated plate theory. Taking the element relative density as design variable, minimizing the weighted linear combination of the mutual strain energy and the strain energy is considered as an objective function to achieve the desired deformation and enough load-carrying capacity of compliant mechanisms with the volume constraint. The topology optimization problem is solved via the optimality criteria and the sensitivity filtering technology. The numerical examples of designing compliant inverters are investigated to demonstrate the effectiveness of the proposed method. And furthermore, the displacements and the stress levels are also discussed for the compliant inverters with different curvilinear fiber laminated sequences.

Laminated Composite Plate Theory With Improved In-Plane Responses

1986 ◽  
Vol 53 (3) ◽  
pp. 661-666 ◽  
Author(s):  
H. Murakami
Keyword(s):  
Variational Principle ◽  
Composite Plate ◽  
Plate Theory ◽  
Laminated Composite ◽  
Laminated Plates ◽  
Thickness Variation ◽  
Laminated Plate ◽  
Laminated Composite Plate ◽  
Cylindrical Bending ◽  
Shear Deformable

In order to improve the accuracy of the in-plane response of the shear, deformable laminated composite plate theory, a new laminated plate theory has been developed based upon a new variational principle proposed by Reissner (1984). The improvement is achieved by including a zigzag-shaped C0 function to approximate the thickness variation of in-plane displacements. The accuracy of this theory is examined by applying it to a problem of cylindrical bending of laminated plates which has been solved exactly by Pagano (1969). The comparison of the in-plane response with the exact solutions for symmetric three-ply and five-ply layers has demonstrated that the new theory predicts the in-plane response very accurately even for small span-to-depth ratios.

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