Design of variable stiffness panels for maximum strength using lamination parameters

A method to optimise the fibre angle distribution of variable stiffness laminates is proposed. The proposed method integrates a fibre angle retrieval step with a fibre angle optimisation procedure. A multi-level approximation approach is used in combination with the method of successive approximations. First, fibre angle retrieval is done by approximating the structural responses based on the optimal stiffness distribution found using lamination parameters. The full fibre angle optimisation is done by updating the approximations based on the current stacking sequence. It is shown for a bucking optimisation with a stiffness constraint that the number of finite element analyses reduces significantly by starting the optimisation from the optimal stiffness distribution rather than from a user-specified stacking sequence. Next, it is shown that updating the approximations also leads to considerable improvements over fibre angle retrieval. Similar promising results are obtained for a stress optimisation problem.

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“…The second example problem is the taken from Khani et al [38]. A plate with a circular cut-out loaded in tension is optimised for strength.…”

Section: Strength Optimisationmentioning

confidence: 99%

“…The material stiffness properties are as follows: E 1 = 142.9GPa, E 2 = 10.3GPa, G 12 = 7.2GPa and ν 12 = 0.27. The failure is defined using the conservative omni-strain envelope [39,38,40]. The total laminate has a thickness of 4.6mm, meaning there are 24 layers.…”

Section: Strength Optimisationmentioning

confidence: 99%

Effect of steering limit constraints on the performance of variable stiffness laminates

Peeters

Lozano

Abdalla

2018

Computers & Structures

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“…Variable thickness and variable stiffness were studied to maximize the natural frequencies. 9,10 All these researches made great contributions to the design of panel-type structures and provided the engineers with excellent references for the design and manufacture of new panel structures.…”

Section: Introductionmentioning

confidence: 99%

Dynamic design of stiffeners for a typical panel using topology optimization and finite element analysis

Zhou

Fei

2015

Advances in Mechanical Engineering

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The design of stiffeners is an effective approach to enhance the stiffness of panel-type structures. However, the stiffnessmass efficiency depends largely on the spacing, orientation, and cross-section of the stiffeners. In order to improve the stiffness-mass efficiency, this article presents a combined use of topology optimization and finite element analysis to the dynamic design of stiffeners for a typical panel. Finite element models of a flat and a stiffened rectangular panel were constructed. Modal analysis was conducted on the two panels to obtain the basic dynamic properties. Topology optimization model of the stiffened panel, so-called initial structure, was built based on the variable density method. According to the loading case and the predominant mode of the system, the objective function was determined to maximize the fundamental frequency of the panel. The stiffeners were chosen as the design domain. Optimal material density distributions of the stiffeners were obtained at different mass fraction. The finite element model of the optimal stiffened panel was built to reanalyze the dynamic properties and responses. An increase in the relative rate of change in the fundamental frequency versus mass was observed between before and after the optimization.

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“…Nowadays, there are efficient methodologies to design the optimal fiber orientation so as to maximize the structural efficiency of VSP [11,12,13,14,15], accounting for the manufacturing defects as well [16,17,18]. These defects appear during the tow-steering process and are inherent to the AFP head mechanism [3].…”

mentioning

confidence: 99%

Effect of tow-drop gaps on the damage resistance and tolerance of Variable-Stiffness Panels

Falcó

Lopes

Mayugo

et al. 2014

Composite Structures

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This paper presents an experimental study of the effects of tow-drop gaps in Variable Stiffness Panels under drop-weight impact events. Two different configurations, with and without ply-staggering, have been manufactured by Automated Fiber Placement and compared with their baseline counterpart without defects. For the study of damage resistance, three levels of low velocity impact energy are generated with a drop-weight tower. The damage area is analyzed by means of ultrasonic inspection. Results indicate that the influence of gap defects is only relevant under small impact energy values. However, in the case of damage tolerance, the residual compressive strength after impact does not present significant differences to that of conventional straight fiber laminates. This indicates that the strength reduction is driven mainly by the damage caused by the impact event rather than by the influence of manufacturing-induced defects.

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Design of variable stiffness panels for maximum strength using lamination parameters

Cited by 135 publications

References 31 publications

Effect of steering limit constraints on the performance of variable stiffness laminates

Effect of steering limit constraints on the performance of variable stiffness laminates

Dynamic design of stiffeners for a typical panel using topology optimization and finite element analysis

Effect of tow-drop gaps on the damage resistance and tolerance of Variable-Stiffness Panels

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