Effects of curing time and de-molding temperature on the deformation of glass fiber/epoxy resin prepreg laminates fabricated by rapid hot press

Zhang, Kaomin; Gu, Yi; Li, Min; Wang, Shaokai; Zhang, Zuoguang

doi:10.1177/0967391119845696

Cited by 6 publications

(3 citation statements)

References 24 publications

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“…After finishing the curing process, the specimen is removed from the mechanical press so it can cool down to room temperature. In the outline of this procedure, internal material tensions lead to workpiece deformations, and thus alternating stress or strain forces interacting with the embedded sensor and the fiber-to-chip junction [ 41 ]. The cured CFRP specimen with embedded PPBG, exhibiting a post-curing thickness of 2.6 mm, is also shown in Figure 7 b, while the integrated polymer sensor’s reflection spectra, before and after curing, are shown in Figure 7 c.…”

Section: Resultsmentioning

confidence: 99%

Microstructure-Based Fiber-To-Chip Coupling of Polymer Planar Bragg Gratings for Harsh Environment Applications

Kefer

Sauer

Hessler

et al. 2020

Sensors

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This article proposes and demonstrates a robust microstructure-based fiber-to-chip coupling scheme for planar Bragg grating devices. A polymer planar Bragg grating substrate is manufactured and microstructured by means of a micromilling process, while the respective photonic structures are generated by employing a sophisticated single-writing UV-exposure method. A stripped standard single mode fiber is inserted into the microstructure, which is filled with a UV-curable adhesive, and aligned with the integrated waveguide. After curing, final sensor assembly and thermal treatment, the proposed coupling scheme is capable of withstanding pressures up to 10 bar, at room temperature, and pressures up to 7.5 bar at an elevated temperature of 120 °C. Additionally, the coupling scheme is exceedingly robust towards tensile forces, limited only by the tensile strength of the employed single mode fiber. Due to its outstanding robustness, the coupling scheme enables the application of planar Bragg grating devices in harsh environments. This fact is underlined by integrating a microstructure-coupled photonic device into the center of a commercial-grade carbon fiber-reinforced polymer specimen. After its integration, the polymer-based Bragg grating sensor still exhibits a reflection peak with a dynamic range of 24 dB, and can thus be employed for sensing purposes.

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Section: Resultsmentioning

confidence: 99%

Microstructure-Based Fiber-To-Chip Coupling of Polymer Planar Bragg Gratings for Harsh Environment Applications

Kefer

Sauer

Hessler

et al. 2020

Sensors

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“…Thus, the inability to accurately design the curing process may lead to a poor fibre/matrix bonding, large residual stress, and can even lead to thermal degradation of the matrix due to high temperature [57]. [58] Biobased Epoxy resin Pouladvand et al, [59] DGEBA Epoxy and EPON828 Epoxy resin H. Li et al, [60] Epoxy Resin Gbadeyan et al, [61] LR 30 and LH 30 Epoxy resin Memon et al, [62] AFG-90H Epoxy resin Walte et al, [63] HSC 7660 Epoxy resin Shi et al, [64] Epoxy Resin Raju et al, [65] LY556 Epoxy resin C. Zheng et al, [66] Phenolic Resin S. Yang et al, [67] DGEBA Epoxy resin S. Y. Kim et al, [68] EPON828 Epoxy resin Austermann et al, [69] Epoxy-based photopolymer resin EPX81 K. Zhang et al, [70] DGEBA E51 Epoxy resin Shukla et al, [71] LY556 Epoxy resins Jenkins et al, [72] IN2 Epoxy Ekrem et al, [73] DGEBA Epoxy resin Zhao et al, [74] DGEBA Epoxy resin Lei et al, [75] Modified resol phenolic resin Billisik and Sapanci [76] Araldite EPN 1138 Phenolic Resin Ciesielski et al, [77] DGEBA Epoxy resin Asaro et al, [78] Ammonium-modified phenolic resin Martins et al, [79] DGEBA Epoxy resin M. Li et al, [80] Epoxy resin E51…”

Section: Factors That Affect the Rheological Behaviour 31 The Study Of Impregnation Process Using Various Types Of Resin And Fibresmentioning

confidence: 99%

A Rheological Study of Fibre Reinforced Composites and The Factors That Affect Rheological Behaviour During Impregnation Process: A Review

Zuhudi

Fadzil

Zulkifli

et al. 2021

ARFMTS

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Rheological behaviour is an important factor affecting the flow behaviour of a fluid and many aspects related to this, mainly in the manufacturing process of fiber reinforced composites, either for Newtonian fluids or non-Newtonian fluids. During impregnation process, the viscosity changes with temperatures and their strain rate, has influenced the resin flow behaviour during curing process. In this paper, a review on the rheological studies of fiber reinforced composites for both, synthetic and natural based fibers, respectively, are presented. In addition to that, this review paper highlighting a few research studies conducted in literature on the main factors that affecting the rheological quality and performance of the composites. The aims of this review, mainly to capture the trend ranging from the recent five years back and summarize the various studies via experimental, theoretical or modelling works. Furthermore, also aiming to provide an ideal baseline information in the selection of the methods regarding rheological study to ensure better quality of pre-preg product and fibre reinforced composites can be produced in the author’s future work.

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“…LTs are also used to perform measurements in industrial processes. For instance, in Zhang et al [11], the authors fabricated composite laminates by rapid hot press process. To do this, prepreg was used.…”

Section: Introductionmentioning

confidence: 99%

Study on LT Accuracy Improvement by Calibration Based on Network Measurements

Velázquez

Conte

Majarena

et al. 2021

Sensors

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Laser trackers (LT) are widely used to calibrate other machines. Nevertheless, very little is known about calibrating an LT. There are some standards that allow us to evaluate the LT performance. However, they require specialized equipment. A calibration procedure to improve the LT accuracy in an easy and fast way is presented in this paper. This method is based on network measurements where a set of reflectors were measured from different LT positions in a working environment. The methodology proposed deal with the lack of nominal data of the reflector mesh. A measurement scenario was defined, based on error parameter dependence on distances and angles, thus, obtaining those positions more sensitive to errors. The influence of the incidence angle of the laser beam on the reflector was characterized, revealing that its contribution to the LT measurement error can be up to 13 µm. Error kinematic parameters were identified to provide the optimum value of an objective function, where the reflector mesh nominal data were unknown. The calibration procedure was validated with nominal data, by measuring a set of reflectors located on a coordinate measuring machine. The findings of this study suggested that the LT accuracy can be improved up to 25%. Moreover, the method can be carried out by the LT user without requiring specialized equipment.

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Effects of curing time and de-molding temperature on the deformation of glass fiber/epoxy resin prepreg laminates fabricated by rapid hot press

Cited by 6 publications

References 24 publications

Microstructure-Based Fiber-To-Chip Coupling of Polymer Planar Bragg Gratings for Harsh Environment Applications

Microstructure-Based Fiber-To-Chip Coupling of Polymer Planar Bragg Gratings for Harsh Environment Applications

A Rheological Study of Fibre Reinforced Composites and The Factors That Affect Rheological Behaviour During Impregnation Process: A Review

Study on LT Accuracy Improvement by Calibration Based on Network Measurements

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