Numerical approach of the injection molding process of fiber-reinforced composite with considering fiber orientation

Thi, Thanh Binh Nguyen; Yokoyama, Akira; Ota, Kohei; Kodama, Katsuhiro; Yamashita, Katsuhisa; Isogai, Yumiko; Furuichi, Kenji; Nonomura, Chisato

doi:10.1063/1.4873846

Cited by 11 publications

(6 citation statements)

References 6 publications

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“…Recent decades had seen the fast progress in computer simulation methods, and now the numerical simulation has become a powerful method to improve the quality and processing of polymer products [12][13][14][15][16][17][18][19][20][21]. Wang et al [12] adopted FEM and the arbitrary Lagrangian-Eulerian (ALE) method to track the free surface of a polymer melt flow in the filling processing.…”

Section: Introductionmentioning

confidence: 99%

Multi-Scale Numerical Approach to the Polymer Filling Process in the Weld Line Region

Wang²,

Saeed³

2022

FU Mech Eng

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In this paper, a multi-scale coupling mathematical model is suggested for simulating the polymer filling process in the weld line region on a micro scale. The model considers two aspects: one is the coupling model based on stresses in the whole cavity region; the other is the multi-scale coupling model of continuum mechanics (CM) and the molecular dynamics (MD) in a weldline region. A weak variational formulation is constructed for the finite element method (FEM), which is coupled with the Verlet algorithm based on the domain decomposition technique. Meanwhile, an overlap region is designed so that the FEM and the MD simulations are consistent with each other. The molecular backbone orientation of the whole cavity is illustrated and the position of the weld line is determined by the characteristics of the molecular backbone orientation. Finally, the properties of the polymer chain in the weld line region are studied conformationally and dynamically. The conformational changes and movement process elucidate that the polymer chains undertake stretching, entangling and orientating. Moreover, the effect of the number of chains and melt temperature on the spatial properties of chain conformation are investigated.

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Section: Introductionmentioning

confidence: 99%

Multi-Scale Numerical Approach to the Polymer Filling Process in the Weld Line Region

Wang²,

Saeed³

2022

FU Mech Eng

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“…Most of these models are based on the micro mechanical approaches, which go back to the work of Mori and Tanaka [13] and formulations for nonlinear mechanical material behavior according to Besson [14]. Over the years, these models are extended and further developed to cover more and more influences, such as fiber interaction, fiber clustering, and process parameters [15,16]. Today's simulative description of non-linear inhomogeneous materials is mainly based on the approach of constitutive equations [17] and a homogenization of pseudo grains [18] as well as multi scale approaches [19].…”

Section: Introductionmentioning

confidence: 99%

Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

et al. 2021

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To ensure the usability of parts made of fiber-reinforced polymers, a lifetime assessment has to be made in an early stage of the development process. To describe the whole life cycle of these parts, continuous simulation chains can be used. From production to the end of the service life, all influences are mapped virtually. The later material strength is already given after the manufacturing process due to the process dependent fiber alignment. To be able to describe this fiber orientation within the lifetime assessment, this paper presents an approach for model calibration and data set determination to consider the local micro-structure. Therefore, quasi-static and cyclic tests were performed on specimens with longitudinal and transversal fiber orientation. A supplementary failure analysis provides additional information about the local micro-structure. The local fiber orientation is determined with µCT (micro computer tomography)-measurements, correlated to the extraction positions of the specimen, and implemented in a dataset. With an attached lifetime calculation on a demonstrator, a major influence of the local micro-structure on the calculation results can be shown. Therefore, it is indispensable to consider the local fiber orientation in the data set determination of short fiber reinforced polymers.

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“…However, few are the studies, which simultaneously report the investigation of both relationships. Moreover, in the cases including a process‐induced weld line, μ‐CT is more frequently used to investigate the effect of processing parameters on microstructure . A nonextensive summary of main publications referring to the μ‐CT analysis of SFRPs is provided in Table .…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale X‐Ray Microtomography Analysis of Fiber Orientation in Weld Line of Short Glass Fiber Reinforced Thermoplastic and Related Elasticity Behavior

Ayadi

Nouri

Guessasma

et al. 2016

Macro Materials & Eng

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Large‐scale X‐ray microcomputed tomography (μ‐CT) is used to investigate microstructural features of weld lines in a short glass fiber reinforced polymer. The main originality of this work is related to the evaluation of local structural and mechanical characteristics in zones of unmastered heterogeneities. Complete and incomplete injection molded plates are considered to investigate weld lines with and without process‐induced porosity. Using a helical scanning trajectory, the full 3D microstructure is obtained at centimetric scale to cover a large zone including first contact between colliding fronts at a voxel size of 3 μm. Microstructure analyses show that weld line area is ill‐ordered at the fiber and structure length scales. Near the first contact point, fiber orientations show the signature of vortexes, which mark the presence of repulsive forces. The presence of micrometric porosity is only confirmed in incomplete plates. μ‐CT images are used as inputs to create a full‐scale finite element model for assessing strain localization. Predicted principal strains are compared to digital image correlation measurements performed during uniaxial tensile tests. Full‐scale modeling combined to 3D high‐resolution imaging proves high potential to correlate local fiber heterogeneities with strain localization effects.

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Numerical approach of the injection molding process of fiber-reinforced composite with considering fiber orientation

Cited by 11 publications

References 6 publications

Multi-Scale Numerical Approach to the Polymer Filling Process in the Weld Line Region

Multi-Scale Numerical Approach to the Polymer Filling Process in the Weld Line Region

Model Calibration and Data Set Determination Considering the Local Micro-Structure for Short Fiber Reinforced Polymers

Large‐Scale X‐Ray Microtomography Analysis of Fiber Orientation in Weld Line of Short Glass Fiber Reinforced Thermoplastic and Related Elasticity Behavior

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