Study on flexural vibration of triangular composite plates influenced by fibre orientation

Composites ◽  
1990 ◽  
Vol 21 (4) ◽  
pp. 358
Keyword(s):  
Fibre Orientation ◽  
Flexural Vibration ◽  
Composite Plates

Optimum Design of Fibre Orientation Angles in Composite Laminate Plates for Minimum Thickness

2010 ◽  
Author(s):  
Rasoul Khandan ◽  
Siamak Noroozi ◽  
Philip Sewell ◽  
John Vinney ◽  
Mohammad Reza Ramazani
Keyword(s):  
Transverse Shear ◽  
Composite Laminate ◽  
Fibre Orientation ◽  
Laminated Composite ◽  
Composite Plates ◽  
Failure Criteria ◽  
Local Optimum ◽  
Minimum Thickness ◽  
Starting Point ◽  
The Difference

Previous studies have shown that composite fibre orientation angles can be optimised for specific load cases such as longitudinal or in-plane loading. However, the methodologies utilised in these studies cannot be used for general analysis of such problems. This research presents a methodology whereby the thickness of laminated composite plates is minimised by optimising the fibre orientation angles for different load cases. Therefore, the effect of transverse shear forces is considered in this study. Simulated annealing (SA), which is a type of stochastic optimisation method, is used to search for the optimal design. This optimisation algorithm has been shown to be reliable as it is not based on the starting point and it can escape from the local optimum points. In accordance with the annealing process where temperature decreases gradually, this algorithm converges to the global minimum. In this research, the Tsai-Wu failure and maximum stress criteria for composite laminate are chosen. Tsai-Wu failure is operationally simple and readily amenable to computational procedures. In addition, this criterion shows the difference between tensile and compressive strengths clearly, through its linear terms. By applying two failure criteria at the same time the results are more reliable. Finally, the numerical results are obtained and compared to the results of previous research with specific loadings to validate the methodology. Additionally the ply angles of composite plate are optimised by considering the effect of transverse shear force and induced twist angles.

scholarly journals A comprehensive study on the buckling behaviour of woven composite plates with major aerospace cutouts under uniaxial loading

2019 ◽  
Vol 13 (2) ◽  
pp. 4756-4776 ◽  
Author(s):  
S. B. Rayhan
Keyword(s):  
Finite Element ◽  
Fibre Orientation ◽  
Plate Thickness ◽  
Orientation Angle ◽  
Composite Plates ◽  
Experimental Tests ◽  
Buckling Load ◽  
Critical Buckling Load ◽  
Good Agreement ◽  
Comprehensive Study

Current research paper presents a comprehensive study based on Finite Element Method (FEM) to understand the effect of cutout shape and area on the buckling behaviour of E-glass composite plates. Considered plate has a dimension of 150 mm × 75mm × 3mm where loading edges are simple supported (shorter side) and other two edges are free. Major aerospace cutout shapes i.e. circular, square, elliptical (horizontal and vertical) and diamond are studied to understand their effect on plates’ critical buckling load. FE code Ansys is adopted to investigate the case studies. A limited number of experimental tests are also carried out in order to validate the FE code results. Overall, a good agreement between experimental and FE code results are found. From finite element analyses, it is found that for any cutout shape, as the cutout area increases, buckling load decreases significantly. Moreover, increasing the plate thickness by 0.5 mm can raise the buckling load up to 50%. More importantly, fibre orientation angle has most significant effect on the critical buckling load of plates where fibre orientation aligned with loading direction can increase the plates’ critical buckling load from 2.6 to 2.8 times than aligned with 900.

scholarly journals Three Dimensional Parametric Analyses on Effect of Fibre Orientation for Stress Concentration Factor in Fibrous Composite Cantilever Plate with Central Circular Hole under Transverse Loading

2012 ◽  
Vol 13 (2) ◽  
Author(s):  
Nitin Jain ◽  
MOON Banerjee ◽  
Shubhashish Sanyal
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Elastic Constants ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Fibre Orientation ◽  
Fibrous Composite ◽  
Three Dimensional ◽  
Composite Plates ◽  
Transverse Loading

ABSTRACT: A number of analytical and numerical techniques are available for the two dimensional study of stress concentration around the hole(s) in isotropic and composite plates subjected to in-plane or transverse loading conditions. The information on the techniques for three dimensional analyses of stress concentration factor (SCF) around the hole in isotropic and composite plates subjected to transverse loading conditions is, however, limited. The present work emphasizes on the effect of fibre orientation (q) on the stress concentration factor in fibrous composite plates with central circular hole under transverse static loading condition. The work is carried out for cantilever fibrous composite plates. The effects of thickness -to- width (T/A) and diameter-to-width (D/A) ratios upon SCF at different fibre orientation are studied. Plates of four different composite materials were considered for hole analysis in order to determine the sensitivity of SCF with elastic constants. Deflections in transverse direction were calculated and analysed. All results are presented in graphical form and discussed. The finite element formulation and its analysis were carried out using ANSYS package.ABSTRAK: Terdapat pelbagai teknik analitikal dan numerical untuk kajian tumpuan tegasan dua dimensi di sekeliling lubang-lubang dalam komposit isotropik dan plat pada satah atau keadaan bebanan melintang. Bagaimanapun, maklumat mengenai kaedah analisis tiga dimensi untuk faktor ketumpatan tegasan (SCF) sekitar lubang dalam komposit isotropik dan plat pada keadaan bebanan melintang adalah terhad. Kertas ini menekankan kesan orientasi gentian (q) pada faktor tumpuan tegasan dalam komposit plat bergentian dengan lubang berpusat di bawah keadaan bebanan melintang. Kajian ini dilkukan untuk cantilever plat komposit bergentian. Kesan ketebalan terhadap kelebaran plat (T/A) dan diameter terhadap kelebaran komposit (D/A) dengan SCF pada orientasi gentian berbeza telah dikaji. Plat komposit bagi empat bahan komposit berbeza telah diambilkira bagi kesemua analisis untuk mendapatkan kesensitifan SCF dengan konstan elastic. Defleksi pada arah melintang telah dikira dan dianalisa. Kesemua keputusan telah disembahkan secara grafik dan dibincang. Fomulasi unsur finit dan analisis telah dilaksanakan menggunakan pakej ANSYS.KEYWORDS:          finite element method; stress concentration factor; composites; transverse loading; deflection; elastic constants

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