Through fiber orientation investigation to visualize compression molding

Hsu, Chih-Chung; Chiu, Hsien-Sen; Huang, Chao-Tsai; Chang, Rong‐Yeu

doi:10.1063/1.4873856

Cited by 9 publications

(2 citation statements)

References 2 publications

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“…10 Despite the great contribution already made by previous works regarding the comprehension of the phenomena, due to the inherent complexity of this relationship, most of the investigations are still limited to the analysis of rather simple analytical or standard geometries like the end-gated rectangular plate or the center-gated disk. 20–23…”

Section: Introductionmentioning

confidence: 99%

Development of the layered structure in a double-gated glass fiber-reinforced polypropylene injection molding: Experimental and simulated results

Quintana

Frontini

2018

Journal of Reinforced Plastics and Composites

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The present study aims to experimentally validate numerical simulation of fiber orientation distribution performed by molding simulation software Moldex3D in a double-gated injection-molded glass fiber-filled (40 wt%) polypropylene box, by making a detailed comparison of predicted and experimentally measured fiber orientation distribution data. The modeling approach evaluated in this work consists in the implementation of the Folgar–Tucker rotary diffusion model with the invariant-based optimal fitting closure approximation for the fourth-order orientation tensor. The specimen used has a weld line in the center and sharp corners. This investigation characterizes in detail the development of the through-thickness layered structure at distinctive locations of the specimen. The sensitivity of fiber orientation distribution and the layered structure to changes upon injection time and melt temperature is also evaluated. The boxes display the typical layered laminate structure, with fibers aligned in the main flow direction near the walls (shell layer) and less oriented in the middle plane (core layer). The boxes injected at the lowest melt temperature display an additional skin layer. Unfortunately, simulation fails in predicting the five layers structure developed under these latter conditions. The grade of fiber orientation is deemed to be independent of process parameters but not the layered structure.

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Section: Introductionmentioning

confidence: 99%

Development of the layered structure in a double-gated glass fiber-reinforced polypropylene injection molding: Experimental and simulated results

Quintana

Frontini

2018

Journal of Reinforced Plastics and Composites

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“…Glass fiber reinforced polymer composite is a new composite, which is widely applied in aerospace, automobile, petrochemical industry, building materials and sports equipments etc. Because the fibers can orient during injection molding process and the orientation has close relationship with plastics parts' mechanical properties, there are many factors that can affect fiber orientation such as matrix materials properties, reinforced fiber properties, processing parameters and mold geometry so forth [1][2][3]. Therefore, researches on fibers orientation are hot issues up to now.…”

Section: Introductionmentioning

confidence: 99%

3D Numerical Simulation Research on the Effect of Gate Location on Fiber Orientation and Injection-Molded Parts Deformation

Liu

Xiong

Huang

et al. 2012

AMR

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Based on generalized non-Newtonian fluid with seven parameters Cross-WLF viscosity model and modified 2-domain Tait model, the injection process of short glass fiber-reinforced polypropylene is simulated with a true 3D model. The effects of gate location on clamp force, fiber orientation and parts deformation are investigated. The results show that: (1) Clamp force of the 3rd scheme that gate location is set on the center of long-side is the largest and that of the 1st scheme that gate location is set on the center of top is the smallest. (2)Because of shear stress, in the direction of thickness, the distributions of fiber orientation are layered orderly, namely, the degree of fiber orientation in core layer is the lowest, but that in subsurface layer is the highest. While perpendicular to the shear flow, the layering distribution isn’t obvious. (3) Compared the three schemes in respect of clamp force and parts deflection, the 3rd scheme is the poorest, which should not be adopted as can as possible, while the 1st scheme and 2nd scheme are reasonable.

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