Estimation of buckling loads of laminated composite plates with flaws using a system identification approach

1997 ◽  
Author(s):  
Anil Salunkhe ◽  
Prasanna Mujimdar ◽  
Anil Salunkhe ◽  
Prasanna Mujimdar
Keyword(s):  
System Identification ◽  
Laminated Composite ◽  
Composite Plates ◽  
Laminated Composite Plates ◽  
Buckling Loads ◽  
Identification Approach

Design of Laminated Composite Plates for Maximum Shear Buckling Loads

1993 ◽  
Vol 115 (4) ◽  
pp. 314-322 ◽  
Author(s):  
R. R. Chang ◽  
K. H. Chu ◽  
T. Y. Kam
Keyword(s):  
Optimal Design ◽  
Optimization Technique ◽  
Laminated Composite ◽  
Composite Plates ◽  
Global Maximum ◽  
Laminated Composite Plates ◽  
Buckling Loads ◽  
Aspect Ratios ◽  
Axial Forces ◽  
Shear Buckling

The optimal lamination arrangements of laminated composite plates with maximum shear buckling loads are studied via a multi-start global optimization technique. A previously proposed shear deformable finite element is used to evaluate the positive and negative shear buckling loads of laminated composite plates in the optimal design process. Optimal lay-ups of thin as well as moderately thick composite plates with global maximum positive or negative shear buckling loads are determined utilizing the multi-start global optimal design technique. A number of examples of the optimal shear buckling design of symmetrically and antisymmetrically laminated composite plates with various material properties, length-to-thickness ratios, aspect ratios and different numbers of layer gorups are given to illustrate the trends of optimal layer orientations of the plates. Since the existence of in-plane axial forces is possible, the effects of axial compressive load on the optimal layer orientations for maximum shear buckling load are also investigated.

scholarly journals Harmony Search Optimisation of Dispersed Laminated Composite Plates

Materials ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 2862 ◽  
Author(s):  
Celal Cakiroglu ◽  
Gebrail Bekdaş ◽  
Zong Geem
Keyword(s):  
Search Algorithm ◽  
Harmony Search ◽  
Laminated Composite ◽  
Composite Plates ◽  
Harmony Search Algorithm ◽  
Buckling Load ◽  
Side Length ◽  
Laminated Composite Plates ◽  
Buckling Loads ◽  
Aspect Ratios

One of the major goals in the process of designing structural components is to achieve the highest possible buckling load of the structural component while keeping the cost and weight at a minimum. This paper illustrates the application of the harmony search algorithm to the buckling load maximisation of dispersed laminated composite plates with rectangular geometry. The ply thicknesses and fiber orientation angles of the plies were chosen as the design variables. Besides the commonly used carbon fiber reinforced composites, boron/epoxy and glass/epoxy composite plates were also optimised using the harmony search algorithm. Furthermore, the optimisation algorithm was applied to plates with three different aspect ratios (ratio of the longer side length to the shorter side length of the plate). The buckling loads of the plates with optimised dispersed stacking sequences were compared to the buckling loads of plates with the commonly applied 0°, ±45°, and 90° fiber angle sequence and identical ply thicknesses. For all three aspect ratios and materials in this study, the dispersed stacking sequences performed better than the plates with regular stacking sequences.

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