scholarly journals Stacking sequence and shape optimization of laminated composite plates via a level-set method

2016 ◽  
Vol 97 ◽  
pp. 168-196 ◽  
Author(s):  
G. Allaire ◽  
G. Delgado
Keyword(s):  
Shape Optimization ◽  
Level Set Method ◽  
Level Set ◽  
Laminated Composite ◽  
Composite Plates ◽  
Stacking Sequence ◽  
Laminated Composite Plates

scholarly journals Experimental and Numerical Buckling Analyses of Laminated Composite Plates under Temperature Effects

2010 ◽  
Vol 19 (4) ◽  
pp. 096369351001900 ◽  
Author(s):  
Emin Ergun
Keyword(s):  
Composite Plate ◽  
Numerical Solutions ◽  
Laminated Composite ◽  
Composite Plates ◽  
Buckling Load ◽  
Fibre Reinforcement ◽  
Stacking Sequence ◽  
Laminated Composite Plates ◽  
Different Temperatures ◽  
Good Agreement

The aim of this study is to investigate, experimentally and numerically, the change of critical buckling load in composite plates with different ply numbers, orientation angles, stacking sequences and boundary conditions as a function of temperature. Buckling specimens have been removed from the composite plate with glass-fibre reinforcement at [0°]i and [45°]i (i= number of ply). First, the mechanical properties of the composite material were determined at different temperatures, and after that, buckling experiments were done for those temperatures. Then, numerical solutions were obtained by modelling the specimens used in the experiment in the Ansys10 finite elements package software. The experimental and numerical results are in very good agreement with each other. It was found that the values of the buckling load at [0°] on the composite plates are higher than those of other angles. Besides, symmetrical and anti-symmetrical conditions were examined to see the effect of the stacking sequence on buckling and only numerical solutions were obtained. It is seen that the buckling load reaches the highest value when it is symmetrical in the cross-ply stacking sequence and it is anti-symmetrical in the angle-ply stacking sequence.

Shape Optimization in Laminated Composite Plates by Growth-Strain Method, Part Two - Stress Control

2004 ◽  
Vol 261-263 ◽  
pp. 839-844 ◽  
Author(s):  
Seok Yoon Han ◽  
J.Y. Park ◽  
Y.J. Ma
Keyword(s):  
Shape Optimization ◽  
Laminated Composite ◽  
Composite Plates ◽  
Volume Control ◽  
Distributed Parameter ◽  
Growth Strain ◽  
Laminated Composite Plates ◽  
Stress Control ◽  
Isotropic Media ◽  
Strain Method

Stress control of the growth-strain method was applied to shape optimization of multiple cutouts in laminated composite plates. Since the growth-strain method optimizes a shape by generating the bulk strain to make the distributed parameter uniform, the distributed parameter was chosen as Tsai-Hill value, as volume control of the growth-strain method. In this study, of particular interest is to see whether stress control of the growth-strain method developed for shape optimization in isotropic media would work for laminated composite plates. The shapes optimized by Tsai-Hill fracture index were compared with those of the initial shapes for the various load conditions. As a result, it was verified that stress control of the growth-strain method also worked very well for multiple cutouts optimization in laminated composite plates.

Application of Operator Libraries on Laminate Strength Optimization of Composites

2013 ◽  
Vol 853 ◽  
pp. 686-692
Author(s):  
Gong Dong Wang ◽  
Jun Wang ◽  
Hao Chen
Keyword(s):  
Memetic Algorithm ◽  
Laminated Composite ◽  
Object Oriented ◽  
Composite Plates ◽  
Object Oriented Programming ◽  
Local Operator ◽  
Stacking Sequence ◽  
Laminated Composite Plates ◽  
Practical Design ◽  
Improved Memetic Algorithm

An improved Memetic algorithm is applied in this article. Mathematical model is proposed to optimize the laminate strength. The composites laminate strength optimization system with local operator library and rule operator library has been developed by the object-oriented programming with C++. The local operator has contributed to increase the convergence rate and the rule operators have contributed to implement practical design aspects in optimization of laminated composite plates. A numerical example demonstrates the validity of optimization model and practical applicability of the improved Memetic algorithm; hence, exhibiting the improvement of the method in tackling the stacking sequence.

Shape Optimization of Cutouts in Laminated Composite Plates Using Solid Element

2005 ◽  
Vol 297-300 ◽  
pp. 2740-2745
Author(s):  
Seok Yoon Han ◽  
Y.J. Ma ◽  
J.Y. Park
Keyword(s):  
Shape Optimization ◽  
Three Dimensional ◽  
Laminated Composite ◽  
Composite Plates ◽  
Volume Control ◽  
Growth Strain ◽  
Laminated Composite Plates ◽  
Failure Index ◽  
Solid Element ◽  
Strain Method

Shape optimization was performed to obtain the precise shape of cutouts including the internal shape of cutouts in laminated composite plates by three dimensional modeling using solid element. The volume control of the growth-strain method was implemented and the distributed parameter was chosen as Tsai-Hill failure index for shape optimization. In order to verify the validity of the obtained optimal shapes, the changes of the maximum Tsai-Hill failure index were examined for each load condition and cutouts. The following conclusions were obtained in this study; 1) It was found that growth-strain method was applied efficiently to shape optimization of three dimensional cutouts in anisotropic laminate composite, 2) The optimal three dimensional shapes of the various load conditions and cutouts were obtained, 3) The maximum Tsai-Hill failure index was reduced up to 68% when shape optimization was performed under the initial volume by volume control of growth-strain method.

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