Extended multiscale finite element method for large deflection analysis of thin-walled composite structures with complicated microstructure characteristics

Ren, Mingfa; Cong, Jie; Wang, Bo; Wang, Lei

doi:10.1016/j.tws.2018.05.021

Cited by 5 publications

(3 citation statements)

References 43 publications

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“…Thanks to the rapid advancements in finite element technology, we now have favorable conditions for delving deeply into solving the problem of distortion in composite structural parts, particularly in optimizing process parameters. Ren et al [21] have studied the 3D woven composite process, developing process analysis agent models and optimizing process parameters. Their results demonstrate a reduction in residual strain and process cycle time with the use of optimized parameters.…”

Section: Introductionmentioning

confidence: 99%

Enhancing the Forming Accuracy of CFRP through a Global Compensation Method by Introducing an Optimal Profile

Zhang,

An,

Zhao

2024

Polymers

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Irreversible curing distortion represents a significant limiting factor in the application of high-performance composite structures. Curing distortion is the deviation of a component’s profile from the theoretical profile after demolding. Introducing the optimal compensation profile into the traditional compensation algorithm represents an effective method to enhance CFRPs’ forming accuracy. For this method, it is necessary to obtain the optimal compensating profile by establishing the coordinate model of the curing process parameter and mold profile compensation. The coordinated control model consists of four parameters: the mean value (Dav), root mean square value (Dmsr), minimum (Dmin), and maximum (Dmax) of curing distortion. Two sizes of composite structural parts are manufactured using the global compensation method. We investigate the influence mechanisms of heating, holding, and cooling times on curing distortion and residual stresses and develop a multi-field coupled finite element model. Strong agreement between the numerical and experimental findings serves as evidence for the effectiveness of the numerical model. The middle layer of the fabricated parts exhibit a reduction in residual stresses as the heating and holding times increase, while an opposite trend is noted with an increase in cooling time. Refining the design of curing process parameters can yield the minimum value of curing deformation within the specified resin system interval. Comparisons indicate that the distortion of the composite wall panel structure is reduced by 86.2% through the use of the global compensation method, demonstrating the validity of this approach for composite structures.

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Section: Introductionmentioning

confidence: 99%

Enhancing the Forming Accuracy of CFRP through a Global Compensation Method by Introducing an Optimal Profile

Zhang,

An,

Zhao

2024

Polymers

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“…In addition, it is well known that the mechanical properties of short fiber reinforced composites are highly dependent on microstructure [4,5]. The latter must be considered as a major input to behavior laws and limit criterion (failure or damage) used in finite elements calculation for structure design [6,7]. All the parameters used in the latter constitute the "material card" which determines the mechanical response including the threshold and kinetic of damage and failure.…”

Section: Introductionmentioning

confidence: 99%

Microstructure dependent fatigue life prediction for short fibers reinforced composites: Application to sheet molding compounds

Laribi

Tamboura

Fitoussi

et al. 2020

International Journal of Fatigue

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Because of the high variability of SMC microstructure due to material flow during thermoforming, fatigue life prediction in real automotive structure represents a huge challenge. In this paper, we present a two-step microstructure selection involving an original ultrasonic method which is briefly presented. Then, on the basis of four selected microstructure configurations, an accurate experimental damage analysis is performed including both monotonic and cyclic loading. The high microstructure dependence of the obtained Whöler curves is demonstrated. Moreover, an experimental link between monotonic damage and fatigue life is emphasized. Then, a new fatigue life prediction methodology based on the later is proposed. This methodology also uses a micromechanical damage model in which a local damage criterion is involved for monotonic loading damage prediction. A very good agreement between experimental and predicted Whöler curves is demonstrated for all studied microstructures and three working temperatures. Finally, the model allows building a microstructure dependent Whöler curve abacus which may be very useful for SMC structures design.

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“…In comparison with other multiscale methods, EMsFEM is more suitable for solving the multidimensional vector field problems . This method has been successfully applied in the research of composite materials …”

Section: Introductionmentioning

confidence: 99%

An improved multiscale finite element method for nonlinear bending analysis of stiffened composite structures

Ren

Cong

Wang

et al. 2019

Numerical Meth Engineering

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Stiffened composite structures are commonly composed of skins and stiffeners that are employed to transfer and carry load, respectively. An improved multiscale finite element method is presented for geometrically nonlinear bending analysis of composite grid stiffened laminates. In the developed method, two kinds of strategies for establishing stiffened multiscale models are presented, in which the stiffeners are modeled at different scale. By introducing a virtual degree of freedom and additional coupling terms, multiscale base functions are improved to consider the local effects of stiffeners and coupling effects of composites. To construct the multiscale base functions of stiffened multiscale models, an extended displacement boundary conditions are constructed, in which the displacements of stiffeners are imposed constraints based on the displacement continuous conditions between skin and stiffener. Incremental multiscale finite element formulations are derived based on Total-Lagrange description and von Karman's large deflection plate theory. The incremental displacement boundary conditions are constructed to consider the effect of microscopic unbalanced force on microscopic results. Numerical examples show high efficiency and applicability of the developed method for composite grid stiffened laminates. KEYWORDS displacement boundary conditions, geometrically nonlinear bending analysis, multiscale base functions, multiscale finite element method, stiffened composite structures, stiffened multiscale models Int J Numer Methods Eng. 2019;118:459-481.wileyonlinelibrary.com/journal/nme

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Extended multiscale finite element method for large deflection analysis of thin-walled composite structures with complicated microstructure characteristics

Cited by 5 publications

References 43 publications

Enhancing the Forming Accuracy of CFRP through a Global Compensation Method by Introducing an Optimal Profile

Enhancing the Forming Accuracy of CFRP through a Global Compensation Method by Introducing an Optimal Profile

Microstructure dependent fatigue life prediction for short fibers reinforced composites: Application to sheet molding compounds

An improved multiscale finite element method for nonlinear bending analysis of stiffened composite structures

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