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Effects of Boundary Conditions on Postbuckling Strengths of Composite Laminate with Various Shaped cutouts under In-Plane Shear

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Open Journal of Composite Materials 2013年第2期3卷 38-50页

作者： Dinesh Kumar Shamsher Bahadur Singh Department of Civil Engineering Birla Institute of Technology and Science (BITS) Pilani India.

cutouts are often provided in composite structural components for practical reasons. For instance, aircraft components such as wingspar, fuselage and ribs are provided with cutouts for access, inspection, fuel lines and electric lines or to reduce the overall weight. This paper addresses the effect of boundary condition on buckling and postbuckling responses, failure loads, and failure characteristics of composite laminate with various shaped cutouts (i.e., circular, square, diamond, elliptical-vertical and elliptical-horizontal) and having different lay-ups under in-plane shear (positive and negative) load, using finite-element method. The FEM formulation is based on the first order shear deformation theory in conjunction with geometric nonlinearity using von Karman’s assumptions. The 3-D Tsai-Hill criterion is used to predict the failure of a lamina while the onset of delamination is predicted by the interlaminar failure criterion. It is observed that the effect of boundary condition on buckling, first-ply failure and ultimate failure loads of a quasi-isotropic laminate with cutout is more for positive shear load than that for the negative shear load for almost all cutout shapes. It is also noted that under in-plane shear loads postbuckling stiffness of (0/90)4s laminate with circular cutout is maximum, while it is minimum for (45/—45)4s laminate with circular cutout, irrespective of boundary conditions.

关键词： Boundary Conditions Buckling Postbuckling cutouts Composite Laminate FEM

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Mechanical Buckling Analysis of Composite Panels with/without cutouts

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International Journal of Plant Engineering and Management 2012年第2期17卷 65-76页

作者： Oana Zenaida PASCAN ZHANG Wei-hong Jean Philippe PONTHOT Department of Aerospace and Mechanical Engineering University of Liege Chemin des Chevreuils 1 B-4000 LIEGE 1 BELGIUM Engmeenng Simulation and Aerospace Computing Northwestern Polytechnical University Xi'an 710072

A simplified analytical solution suitable for simple stacking sequences was developed using the Euler buck- ling theory, the structure＇s equations of equilibrium and laminate panel mathematical formulation. Comparing these results with numerical results reveals the accuracy of the method and even more, allows us to validate the nu- merical analysis. Therefore, two important results are obtained： a simplified analytical solution for the buckling problem and validation of the numerical results. Another important and novel finding is related to the influence of the angle ply orientation and of the cutouts, on the buckling load. Under symmetrical boundary conditions and loading case, rectangular panels with elliptical cutouts, give better results for 90~ oriented plies than for 0 oriented ones. With a compression load applied in the X direction, and with material properties 10 times better in X direction than in Y direction, the best results are obtained when the load is aligned with the Y direction associated to the ma- terial reference frame. Moreover, panels with cutouts seem to behave better than panels without cutouts under cer- tainply orientation angles.

关键词： linear buckling analytical solution mechanical loading angle ply orientation cutouts

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Influence of local stiffeners and cutout shapes on the vibration and stability characteristics of quasi-isotropic laminates under hygro-thermo-mechanical loadings

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Defence Technology（防务技术） 2022年第12期18卷 2107-2124页

作者： T.Rajanna K.S.Subash Chandra K.Venkata Rao Department of Civil Engineering B.M.S College of EngineeringBengaluru560019India Research Scholar B.M.S College of EngineeringBengaluru560019India Department of Mechanical Engineering B.M.S Evening College of EngineeringBengaluru560019India Department of Mechanical Engineering Government PolytechnicBagepalli561207India

The perforated stiffened panel is generally found as a sub-component of sophisticated *** fundamental purpose of this panel is to withstand against buckling under complicated loading and environmental ***,an accurate knowledge of critical buckling behaviour of stiffened panels is very much essential for a reliable and lightweight structural *** this paper,the focus is on quasi-laminated panels with different cutout shapes of various sizes and their responses to hygrothermal environments under nonlinearly varying edge loads and is compared with the locally stiffened *** this,the modelling of the panel and stiffener is done by adopting nine-noded heterosis plate elements and three noded beam elements *** stiffener formulation is suitably modified in order to take the torsional effect also into consideration along with the effect of shear ***,the plate and the stiffener elements are treated separately,and then the displacement compatibility is maintained between them by using the transformation *** a given loading and geometric discontinuity,the stress distribution within the perforated panel is highly non-uniform in nature and hence a dynamic approach has been used to calculate buckling loads by adopting two sets of boundary conditions,one set for pre-buckling stress analysis and the second set for buckling *** different quasi-isotropic stacking sequences are deliberated in this work by varying different ply-orientation in each *** study also addresses the effect of various parameters such as nonlinear loads,hygro-thermal loads,cutout size and shapes,position of cutout,stiffener parameters,stacking sequences,thickness of plate and boundary conditions.

关键词： Locally stiffened panels Buckling Vibration cutouts Heterosis Hygrothermal environment

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Analysis on the Effects of Cut-Outs in Hollow Inconel 718 Gas Turbine Shafts

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Open Journal of Applied Sciences 2018年第7期8卷 304-313页

作者： Kaushik V. Prasad Karthik Nagendra Hiriyannaiah Adarsha Abhijeeth Nagaraj Venkatachar Ravinarayan Venkatesh Sandeep Madihalli Kenchappa Ranganatha Swamy Department of Mechanical engineering SET-Jain University Ramanagara India

Gasturbines are provided with cut-outs for minimizing vibrations. Round cut-outs are usually favored but there are various designs which offer more advantages over the circular shape. The objective of this work was to compare stress reduction during the induced vibration in the hollow gas turbine shafts by introducing different cut-outs. Round, square and elliptical cut-outs under different orientations were compared. It is observed that a square cutout at 45°?orientation has the least stress concentration. This is due to the effective orientation of plastic strains along the principal axis.

关键词： Static Analysis Crack Propagation Non Linear Analysis Stress Concentration Square cutouts

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