Effect of Variable Fiber Spacing on Post-Buckling of Boron/Epoxy Fiber Reinforced Laminated Composite Plate

2012 ◽  
Vol 245 ◽  
pp. 126-131
Author(s):  
Ali I. Al-Mosawi
Keyword(s):  
Composite Plate ◽  
Mathematical Formulation ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Primary Objective ◽  
Fiber Reinforced ◽  
Laminated Composite Plate ◽  
Geometric Imperfection ◽  
Fiber Spacing ◽  
Post Buckling

The primary objective of research is to determine the improved structural efficiency of plates can be with variable fiber spacing. The Post-buckling of laminated composite plate with variable fiber spacing is obtained numerically, using eight node isoparametric quadrilateral elements (serendipity element) with five degree of freedom per node. The mathematical formulation is based on first-order shear deformation theory and von-Karman non-linearity. The effect of the initial geometric imperfection, fiber spacing, orientation fiber, and direction of in-plane loading were considered. Numerical results for boron/Epoxy fiber reinforced laminates are presented for the different effects of the composite plate under in-plane loading. This study showed that the post buckling behavior of composite plate very sensitive for type of distribution fiber and the seventh distribution equation gives maximum buckling load and smallest deformation.

Finite Element-Based Stochastic Nonlinear Progressive Failure Response of Piezo-Laminated Composite Plate with Elliptical Cutouts

2019 ◽  
Vol 11 (08) ◽  
pp. 1950076 ◽  
Author(s):  
Achchhe Lal ◽  
Rahul Kumar
Keyword(s):  
Composite Plate ◽  
Failure Load ◽  
Progressive Failure ◽  
Shear Deformation Theory ◽  
Elliptical Hole ◽  
Laminated Composite ◽  
Failure Criteria ◽  
Second Order ◽  
Laminated Composite Plate ◽  
Random System

This paper presents the second-order statistics of hygro-thermo-electrically-induced progressive failure in terms of first-ply failure load (FPFL) and last-ply failure load (LPFL) analysis for laminated composite material plate (LCMP) under out of plane mechanical loading with random system properties. Basic governing equation of nonlinear progressive failure analysis is based on shear deformation theory (higher order) with von-Karman nonlinear kinematics using Newton’s Raphson approach through Tsai–Wu failure criteria. The random input variables are assumed as uncorrelated type and are evaluated using second-order perturbation method (SOPT). Laminated composite plate with elliptical cutouts are subjected to uniformly distributed, point and hydrostatic load. The effect of boundary conditions, temperature variation, moisture content and voltage variations by utilizing piezoelectric layer position and various cutout shapes on the mean and corresponding covariance (COV) of FPFL and LPFL load are evaluated. Convergence of numerical analysis is performed, and results are validated with those available in literatures to check the efficiency of present methodology. It is observed that the presence of elliptical hole always causes an increase in the failure load of plates subjected to bending, even further increase for LPFL due to the reduction of stresses.

scholarly journals Bi-Axial Buckling of Laminated Composite Plates Including Cutout and Additional Mass

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1750 ◽  
Author(s):  
Anish ◽  
Abhay Chaubey ◽  
Ajay Kumar ◽  
Bartłomiej Kwiatkowski ◽  
Danuta Barnat-Hunek ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Composite Plate ◽  
Plate Thickness ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Element Formulation ◽  
Laminated Composite Plate ◽  
Mass Variation ◽  
Additional Mass ◽  
Axial Buckling

In the presented paper, a study of bi-axial buckling of the laminated composite plate with mass variation through the cutout and additional mass is carried out using the improved shear deformation theory (ISDT). The ISDT mathematical model employs a cubic variation of thickness co-ordinates in the displacement field. A realistic parabolic distribution of transverse shear strains through the plate thickness is assumed and the use of shear correction factor is avoided. A C° finite element formulation of the mathematical model is developed to analyze the buckling behavior of laminated composite plate with cutout and additional mass. As no results based on ISDT for the considered problem of bi-axial buckling of the laminated composite plate with mass variation are available in the literature, the obtained results are validated with the data available for a laminated composite plate without cutout and additional mass. Novel results are obtained by varying geometry, boundary conditions and ply orientations.

Second-order statistics of large-amplitude free vibration of a random composite plate

2009 ◽  
Vol 223 (8) ◽  
pp. 1099-1113 ◽  
Author(s):  
P Dash ◽  
B N Singh
Keyword(s):  
Free Vibration ◽  
Composite Plate ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Element Model ◽  
Perturbation Approach ◽  
Deterministic System ◽  
Laminated Composite Plate ◽  
System Equation ◽  
Non Linear

This article addresses the non-linear free vibration stochastic characteristic of a laminated composite plate having random material properties. The transverse shear effects have been included in the system equation in the frame work of higher-order shear deformation theory. The analysis uses Green—Lagrange non-linear strain—displacement relationship to model geometric non-linearity. Direct iteration approach is used to handle deterministic system non-linearity and perturbation approach is presented to handle the randomness in the system properties. Mean and variance of the random natural frequencies have been obtained by employing a C0 isoparametric non-linear finite-element model. Comparisons with the published results show the accuracy of the proposed procedure. A few results covering various features have been presented for a laminated composite plate with different boundary conditions.

scholarly journals A Combined Strain Element in Static, Frequency and Buckling Analyses of Laminated Composite Plates and Shells

2020 ◽  
Author(s):  
Hoang Lan Ton-That ◽  
Hieu Nguyen-Van
Keyword(s):  
Composite Plate ◽  
Shear Deformation Theory ◽  
Laminated Composite ◽  
Composite Plates ◽  
Shell Element ◽  
Shell Structures ◽  
Laminated Composite Plate ◽  
Plate And Shell ◽  
Smoothed Finite Element Method ◽  
Main Notion

This paper deals with numerical analyses of laminated composite plate and shell structures using a new four-node quadrilateral flat shell element, namely SQ4C, based on the first-order shear deformation theory (FSDT) and a combined strain strategy. The main notion of the combined strain strategy is based on the combination of the membrane strain and shear strain related to tying points as well as bending strain with respect to cell-based smoothed finite element method. Many desirable characteristics and the enforcement of the SQ4C element are verified and proved through various numerical examples in static, frequency and buckling analyses of laminated composite plate and shell structures. Numerical results and comparison with other reference solutions suggest that the present element is accuracy, efficiency and removal of shear and membrane locking.

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