Optimum design of laminates containing an elliptical hole

Sharma, Dharmendra S.; Patel, Nirav P.; Trivedi, Reena

doi:10.1016/j.ijmecsci.2014.04.019

Cited by 37 publications

(15 citation statements)

References 21 publications

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“…the highest failure strength was observed for the horizontal ellipses and the lowest for the vertical elliptical holes. The obtained optimal fibre orientations presented by Sharma et al [59] are different than those presented above since the mentioned authors analysed infinite plates only.…”

Section: Buckling Of Cylindrical Shells With Domed Headsmentioning

confidence: 56%

“…The results of buckling investigations for spherical and ellipsoidal domes with and without cylindrical portions and the possibility of optimal design were studied in details by Muc [57,58]. For a infinite laminated plates subjected to axial/biaxial compression/tension or in-plane shear and having a circular/ elliptical hole the optimum design of laminate stacking sequence is presented by Sharma et al [59]. The authors of the paper adapted the formulation and the solution given by Lekhnitski [60], Savin [61] for stresses around holes in an infinite angle-ply balanced symmetric laminated plates under in-plane loading (Fig.1)…”

Section: Buckling Of Cylindrical Shells With Domed Headsmentioning

confidence: 99%

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Evolutionary Design of Engineering Constructions

Muc

2018

Lat. Am. j. solids struct.

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The basic information required to utilize one of possible computation tools/algorithms (mainly the evolution strategy) to solve a wide class of real practical engineering optimization problems is presented and discussed in the present paper. The effectiveness of the considered method is demonstrated by the possibility of the use of different form of objective functions, various and numerous nonlinear constraints and different types of design variables (continuous, discrete, real, integer). The sensitivity of the algorithm to the choice of the evolution strategy parameters is also discussed herein. The generality of the evolution strategy is illustrated by the analysis of various examples dealing with: the design of helical springs, the buckling of cylindrical composite panels and the buckling of pressure vessels with domed heads. Keywords optimal design; evolutionary algorithms, buckling; plated and cylindrical composite panels; pressure vessels, helical springs, strength of laminates.

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Section: Buckling Of Cylindrical Shells With Domed Headsmentioning

confidence: 56%

Section: Buckling Of Cylindrical Shells With Domed Headsmentioning

confidence: 99%

Evolutionary Design of Engineering Constructions

Muc

2018

Lat. Am. j. solids struct.

View full text Add to dashboard Cite

show abstract

“…Therefore, how to decide the two angles of an orthotropic plate in minimization of the stress concentration is important. Sharma et al (2014) researched the optimization of fiber orientation angle for single lamina of composite materials (graphite/epoxy and glass/epoxy) with circular and elliptical holes; however, the hole orientation angle was not taken into consideration. In this paper, not only the fiber orientation angle but also the hole orientation angle are taken into consideration, and other more complicated shapes of holes are considered, in which the maximum absolute value of the tangential stress reaches its minimum value.…”

Section: Introductionmentioning

confidence: 99%

Optimum design of fiber angle and hole orientation of an orthotropic plate

Zhang

Wang

et al. 2018

jtam

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With the goal of decreasing the stress concentration along the hole boundary in an orthotropic plate under inequi-biaxial loadings, an optimum design of the fiber angle and hole orientation is presented. The maximum absolute tangential stress along the hole boundary is taken as the objective function, and the fiber orientation angle and the hole orientation angle are considered as design variables. The conformal transformation method of a complex function and the Differential Evolution (DE) algorithm are used. Two non-circular shapes, ellipse and hexagon are taken as examples to analyze the problem. Based on the results, we can conclude that the major axis of elliptical holes should be designed in the direction of the maximum external loading for a perforated structure in an orthotropic plate. However, the principal direction that has the larger Young's modulus should be inclined to the direction of the minimum loading, especially for a significantly orthotropic plate.

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“…Jafari and Rohani 14 used the analytical solution to determine the stress distribution around different cutouts in perforated composite plates. An optimum design of symmetric laminated plate containing an elliptical cutout and subjected to various in-plane loading conditions was presented by Sharma et al 15 using complex variable approach and GA.…”

Section: Introductionmentioning

confidence: 99%

Optimization of infinite orthotropic plates with hypotrochoid cutout under tensile loading using genetic algorithm

Jafari

Hoseyni

2016

Journal of Reinforced Plastics and Composites

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The effect of geometric discontinuities can be reduced by appropriate choice of parameters affecting the stress distribution around cutout. This is possible if the effective parameters are accurately calculated. In this study, using genetic algorithm, the optimum parameters are introduced in order to achieve the minimum value of stress around cutout. Here, design variables are fiber angle, load angle, aspect ratio of cutout, shape of cutout, rotation angle of cutout, and bluntness parameters. Using the Lekhnitskii’s method, stress distribution around various cutouts is determined. The effect of the aforementioned parameters on the stress values around various shapes of cutouts such as quasi-triangular, quasi-square, and hypotrochoid cutouts is examined. Also, the optimal parameters for each cutout are introduced. The results showed that these parameters have significant effects on stress distribution around the cutouts and the structural load-bearing capacity will increase without changing the type of material if the parameters are correctly chosen.

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Optimum design of laminates containing an elliptical hole

Cited by 37 publications

References 21 publications

Evolutionary Design of Engineering Constructions

Evolutionary Design of Engineering Constructions

Optimum design of fiber angle and hole orientation of an orthotropic plate

Optimization of infinite orthotropic plates with hypotrochoid cutout under tensile loading using genetic algorithm

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