Effects of Partial Edge Loading and Fibre Configuration on Vibration and Buckling Characteristics of Stiffened Composite Plates

Abstract

In this work, the influence of uniaxial and biaxial partial edge loads on buckling and vibration characteristics of stiffened laminated plates is examined by using finite element method. As the initial pre-buckling stress distributions within an element are highly non-uniform in nature for a given loading and edge conditions, the critical loads are evaluated by dynamic approach. Towards this, a nine-node heterosis plate element and a compatible three-node beam element are developed by employing the effect of shear deformation for both the plate and the stiffeners respectively. In the structural modeling, the plate and the stiffener elements are treated separately, and then the displacement compatibility is maintained between them by using a transformation matrix. Effect of different parameters such as loaded edge width, position of loads, boundary conditions, ply-orientations and stiffener factors are considered in this study. Buckling results show that the uniaxial loaded stiffened plate with around (+30 o /-30 o )2 layup can withstand higher load irrespective of boundary conditions and loading patterns, whereas the maximum load resisting layup for the biaxially loaded stiffened plate is purely dependent on edge conditions and loading patterns.

Influence of Trapezoidal Shapes and Cutout Sizes on the Buckling Behaviour of Composite Laminates Under Thermally Induced Loads

“…A 9-noded heterosis plate element has been employed in the current research to investigate the buckling behaviour of the trapezoidal plate. This type of element exhibits high level accuracy as compared to that of 8-noded serendipity and 9-noded Lagrangian elements (Rajanna et al 2016).…”

A Parametric study on the effect of elliptical cutouts for buckling behavior of composite plates under non-uniform edge loads

“…The different participating matrices from Equations (9), (10) and (11) are not shown here to avoid repetitions, which are referred from Rajanna et al (2016a).…”

“…Nevertheless, in several realistic stability problem, the enforced edge load is non-uniform in nature (Lal and Saini, 2013;Tang and Wang, 2011;Zhong and Gu, 2007). Rajanna et al (2016a) studied the effect of partial load on the composite stiffened plate. In such an instance, the stress distributions are likewise non-uniform.…”

“…But, in some cases, panels are also subjected to the tensile type of non-uniform edge loads. Leissa and Ayoub (1988); Deolasi et al (1995); Rajanna et al (2016a) analysed the effects of uniaxial tensile concentrated/patch loads on isotropic/composite plates. The tension buckling phenomenon is practically more importance, especially for the panel with defects like cracks or cutouts.…”

A simple spline finite strip for buckling analysis of composite cylindrical panel with cutout

“…The influence of circular cutout on the buckling load of laminated plate was investigated by Komur and Sonmez (Komur and Sonmez 2008). The effects of cutouts with various shapes (such as circular and elliptical shapes) on the buckling load of composite plates were also evaluated by FEM in the several researches (Arbelo et al 2015, Shuohui et al 2015, Thinh et al 2016, Rajanna et al 2016, Soni et al 2013, Pascan et al 2012.…”