Effects of cavity surface temperature on mechanical properties of specimens with and without a weld line in rapid heat cycle molding

Wang, Guilong; Zhao, Guoqun; Wang, Xiaoxin

doi:10.1016/j.matdes.2012.10.054

Cited by 38 publications

(22 citation statements)

References 29 publications

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“…ey found that the mold surface temperature immediately before filling has a significant influence on the surface appearance of the molded part. In another work, the same research group [27] found that for fiber-reinforced plastics of PP + 20% glass fiber produced through the RHCM, the cavity surface temperature set to 118°C at the filling stage reduced the tensile strength of the part without a weld mark but slightly increased that of the part with a weld mark. e aforementioned studies indicate that the microstructure (e.g., multilayer structure, fiber orientation, state of crystallization, interfacial bonding strength, and surface morphology) and macroperformance (e.g., tensile strength and surface gloss) of GFRPP product molded by RHCM have not been established.…”

Section: Introductionmentioning

confidence: 98%

Microstructure, Tensile Property, and Surface Quality of Glass Fiber-Reinforced Polypropylene Parts Molded by Rapid Heat Cycle Molding

Liu

et al. 2020

Advances in Polymer Technology

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The microstructure of a molded product considerably influences its macroscopic properties. In this study, the influence of molding process on microstructure, tensile property, and surface quality was explored on the glass fiber-reinforced polypropylene (GFRPP) parts molded by rapid heat cycle molding (RHCM) and conversion injection molding (CIM). Tensile strength and surface gloss were chosen to measure macroscopic properties of the molded parts. The microstructure including multilayer, fiber orientation, crystallinity, and fiber-matrix bonding strength were analyzed by simulations, scanning electron microscopy, wide-angle X-ray diffraction, and dynamic mechanical analysis. The relationship between the macroscopic properties and microstructure of the RHCM samples was also discussed. The results indicate that as the mold cavity surface temperature increases, the tensile strength increases firstly and decreases thereafter. The tensile strength of RHCM parts reached the maximum at the mold heating temperature of 60°C. It is also observed that the surface gloss of the sample increases as the mold cavity surface temperature rises, and the increase of surface gloss decreases distinctly with the mold heating temperature higher than 90°C.

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Section: Introductionmentioning

confidence: 98%

Microstructure, Tensile Property, and Surface Quality of Glass Fiber-Reinforced Polypropylene Parts Molded by Rapid Heat Cycle Molding

Liu

et al. 2020

Advances in Polymer Technology

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“…Once the fabrics were manufactured, to assess whether the manufacturing process damaged the fabrics, a tensile test on these fabrics was performed on an Instron 4505 universal testing machine at room temperature (23°C) with a 1KN load cell and a constant speed of 50 mm/min until failure, according to specifications of the standard ISO 527-4:1997 [25]. These processing conditions have a direct influence on the morphological structure of the parts [26][27], and this structure, in turn, influences the properties of the material [28]. This test was not performed with functionalized/hybrid fabrics because no comparison values are available.…”

Section: Validation Of Materialsmentioning

confidence: 99%

Processing and Testing of a Novel Superstructural Material

Pereira¹,

Tielas²,

Prado³

et al. 2021

Preprint

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The need to develop novel lightweight materials and their manufacturing processes is sets out to meet the new aerospace, automotive and construction requirements. Within this context, this research work is proposed to develop a novel thermoplastic composite material with high mechanical properties. These composites will be based on thermoplastic matrixes made from polyamide and 35% short glass fiber filled-polyamide reinforced with different types of fabrics. As reinforcement, glass fiber fabrics will be used as the base. They will be treated with different processes, both chemical and physical, to promote adherence to the matrix. Textile overmoulding technology was selected for manufacturing these composites. This technology was primarily developed to manufacture aesthetic lined components and has achieved a great implantation. Once these new composites are manufactured, they will be submitted to different tests to evaluate their behavior regarding adhesion, impact strength and stiffness. It is expected an improvement on stiffness and impact absorption.

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“…Others 3D works, are interested in the study of simple shape product (specimens [23] or cover plate [24]). For part with complex geometry, Wang et al [25] have investigated two different designs of heating channels for RHCM application.…”

Section: Introductionmentioning

confidence: 99%

Conformal heating/cooling channels design in rapid heat cycle molding process

Kria

Hammami

Baccar

2016

Mechanics & Industry

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A three-dimensional study of the thermal regulation system of Rapid Heat Cycle Molding process producing complex-shaped automotive part was undertaken. This numerical study aims at improving the design of thermal control system so as to improve the quality of the molded part and the process productivity. The thermal responses in mold and cavity are predicted by the commercial Finite Volume Analysis software Fluent 6.3.26 in cyclic transient regime. It was shown that a regular regime is established from the second molding cycle. Besides, the three dimensional thermal responses have shown the limitations of the classic conformal design in terms of temperature uniformity and cycle time for the complex shaped automotive part. Hence, and based on conventional manufacturing process, the efficiency of a new conformal design has been shown. In fact, simple drillings coupled with concentric tubes are able to produce complicated conformal heating/cooling channels, which are easier to fabricate, assemble and which have low manufacture cost compared with other methods. By this proposed new conformal design, we could greatly reduce the cycle time, temperature gap and energy consumption.

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Effects of cavity surface temperature on mechanical properties of specimens with and without a weld line in rapid heat cycle molding

Cited by 38 publications

References 29 publications

Microstructure, Tensile Property, and Surface Quality of Glass Fiber-Reinforced Polypropylene Parts Molded by Rapid Heat Cycle Molding

Microstructure, Tensile Property, and Surface Quality of Glass Fiber-Reinforced Polypropylene Parts Molded by Rapid Heat Cycle Molding

Processing and Testing of a Novel Superstructural Material

Conformal heating/cooling channels design in rapid heat cycle molding process

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