Composite materials are increasingly used in many engineering fields thanks to their lightness and high mechanical properties. Currently, many research activities are focused on the optimization of structures using conventional composite materials, i.e. Constant Stiffness Composite Materials (CSCM). High-performance structures, such as those employed in aerospace engineering, could be further enhanced by using modern automated fibre placement machines, which brought to the emergence of a new class of composites; namely, the Variable Angle Tow (VAT) composites. The main idea of VAT composites is to have an increased freedom in the tailoring of the material properties since the fibres are no longer restricted to be straight and can actually have a curvilinear pattern within each layer. This work presents some sensitivity analyses based on a refined model developed in the domain of the Carrera Unified Formulation (CUF), which has been already demonstrated to be effective for the analysis of VAT structures. Essentially, CUF makes use of arbitrarily high-order kinematics to relax 3D elasticity equations into 1D or 2D theories [1]. Lagrange polynomials have been employed in this work to describe the cross-section variables, because refined 1D models are utilized, obtaining a layer-wise description of the primary variables. Layer-wise approach confirmed the highest accuracy in comparison with equivalent-single-layer models, also for VAT as demostrated by Demasi et al. [2]. The main objective is to study the effect of manufacturing processes on the mechanical response of VAT. Particular attention is focussed on the misalignments of the fibres, which ultimately affect the global properties of the structure. Such misalignment fields are generated by means of stochastic field theory exploiting the correlation matrix decomposition (CMD) method (like those presented in Broek et al. [3]), where relative distances between structural nodes are considered. Several numerical examples show the importance of using a layer-wise approach for sensitivity analysis and design of VAT composite panels, especially when buckling response and redistribution of stress fields are considered

Sensitivity analysis of variable stiffness composite plates by CUF-based layerwise models / Racionero Sanchez-Majano, A.; Pagani, A.; Carrera, E.. - ELETTRONICO. - (2020), pp. 2841-2842. (Intervento presentato al convegno 14th WCCM & ECCOMAS Congress 2020 tenutosi a Paris (France) nel 11-15 January, 2021).

Sensitivity analysis of variable stiffness composite plates by CUF-based layerwise models

Racionero Sanchez-Majano A.;Pagani A.;Carrera E.
2020

Abstract

Composite materials are increasingly used in many engineering fields thanks to their lightness and high mechanical properties. Currently, many research activities are focused on the optimization of structures using conventional composite materials, i.e. Constant Stiffness Composite Materials (CSCM). High-performance structures, such as those employed in aerospace engineering, could be further enhanced by using modern automated fibre placement machines, which brought to the emergence of a new class of composites; namely, the Variable Angle Tow (VAT) composites. The main idea of VAT composites is to have an increased freedom in the tailoring of the material properties since the fibres are no longer restricted to be straight and can actually have a curvilinear pattern within each layer. This work presents some sensitivity analyses based on a refined model developed in the domain of the Carrera Unified Formulation (CUF), which has been already demonstrated to be effective for the analysis of VAT structures. Essentially, CUF makes use of arbitrarily high-order kinematics to relax 3D elasticity equations into 1D or 2D theories [1]. Lagrange polynomials have been employed in this work to describe the cross-section variables, because refined 1D models are utilized, obtaining a layer-wise description of the primary variables. Layer-wise approach confirmed the highest accuracy in comparison with equivalent-single-layer models, also for VAT as demostrated by Demasi et al. [2]. The main objective is to study the effect of manufacturing processes on the mechanical response of VAT. Particular attention is focussed on the misalignments of the fibres, which ultimately affect the global properties of the structure. Such misalignment fields are generated by means of stochastic field theory exploiting the correlation matrix decomposition (CMD) method (like those presented in Broek et al. [3]), where relative distances between structural nodes are considered. Several numerical examples show the importance of using a layer-wise approach for sensitivity analysis and design of VAT composite panels, especially when buckling response and redistribution of stress fields are considered
2020
978-84-121101-7-3
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Descrizione: 14 th WCCM&ECCOMAS Congress, Paris 11-15 January 2021
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2875543