Synthetische Kunststoffe

Domininghaus, Hans

doi:10.1007/978-3-662-06663-8_2

Cited by 7 publications

(9 citation statements)

References 2 publications

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“…The deviation in the curves at 100°C can be caused for example by an material reaction or measurement error but is nevertheless above most of the tempertures measured and simulated in this study. The identical curve progression can be explained by values from the literature like, 1 which show similar trends for the raw materials PA6.6 (0.23 W/(m*K)) and ETFE (0.23 W/(m*K)) but the measured. The specific composition of the material has an influence on the resulting value as also the literature values vary.…”

Section: Methodssupporting

confidence: 73%

“…The specific composition of the material has an influence on the resulting value as also the literature values vary. 1,8,9 With the help of the laser flash measurement, the temperature conductivity α can also be determined, which is related to the thermal conductivity λ as follows.…”

Section: Methodsmentioning

confidence: 99%

“…Generally, gas tight layers are made out of polyamide, which is suitable due to its high temperature resistance and low air permeability. 1…”

Section: Introductionmentioning

confidence: 99%

“…They are thermostable and exhibit a low adhesion to many other materials. 1 To not impede the evacuation of the laminate, the material has to be permeable towards air.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical and experimental validation of critical thermal properties of advanced vacuum bagging for composite manufacturing

Haeberle,

Herrmann,

Fideu

2023

Journal of Composite Materials

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The vacuum bagging is a common but critical step of various manufacturing process chains for Carbon/Glass Fibre reinforced polymers (C/GFRP). Whilst developing a new generation of vacuum bagging, significant efforts have been made to deeply understand the relevant physics fields, process variables involved and to provide predictive approaches to support dimensioning and scaling exercises prior to implementation into real production process. Main features of the new bagging system are, (1) the reduction of material diversity through merging of various properties within one single layer and, (2) the suppression of critical folding steps by using thermoforming for pre-shaping purposes. This paper will mainly focus on considerations of heat transfer during the pre-shaping of the film, directly on the CFRP part short before the curing step. For the better risk assessment of the short time exposition of an uncured composite part to the heat flow, a problem of transient coupled field analysis involving heat transfer via conduction, convection and radiation is formulated and solved by using Finite Element Analysis in COMSOL under consideration of realistic process conditions. Further a section dedicated to the comparison of the obtained results with measurements performed on a system including an IR-emitter, the bagging material, a ground plate and in some studies as well a CFRP sample is included. During the study the influence of time, power output of the emitter, distance between emitter and surface as well as irradiation angle has been assessed including a comparison of simulated results and performed measurements.

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Section: Methodssupporting

confidence: 73%

Section: Methodsmentioning

confidence: 99%

“…Generally, gas tight layers are made out of polyamide, which is suitable due to its high temperature resistance and low air permeability. 1…”

Section: Introductionmentioning

confidence: 99%

“…They are thermostable and exhibit a low adhesion to many other materials. 1 To not impede the evacuation of the laminate, the material has to be permeable towards air.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Theoretical and experimental validation of critical thermal properties of advanced vacuum bagging for composite manufacturing

Haeberle,

Herrmann,

Fideu

2023

Journal of Composite Materials

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“…Polycarbonate (PC) is widely used because of its convincing mechanical properties in many fields of applications [11][12][13][14]. Transparency is a key property of PC.…”

Section: Introductionmentioning

confidence: 99%

Mechanical and Optical Properties of Nanosilica-filled Polycarbonate Composites

Zhou

Burkhart

2009

Journal of Thermoplastic Composite Materials

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In this study, nano-SiO2-filled polycarbonate (PC) composites were produced by direct melt compounding in a Brabender mixer and then compression molded. The mechanical properties were characterized using tensile test, compact tension test, and dynamic mechanical thermal analysis. The results indicate that both stiffness and fracture toughness of PC composites are increased at low particle contents compared to neat PC. However, particle loadings higher than 4 vol. % lead to a decrease in analyzed mechanical properties. The transparency of PC composites, characterized by light transmission, haze, and clarity, is decreased with increase in particle content due to increasing light loss and thermal degradation of PC matrix during kneading process.

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Extrusion‐Based Additive Manufacturing of Cranial Implants Using High‐Performance Polymers: A Comparative Study on Mechanical Performance and Dimensional Accuracy

Fuckner,

Mueller,

Bruyas

et al. 2024

Adv Eng Mater

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Fused filament fabrication (FFF) offers great potential to fabricate patient‐specific implants to treat large size defects resulting from craniectomy. Such cranial implants impose critical requirements on material and design. So far, the field has focused on printing cranial implants from polyetheretherketone (PEEK), which is semicrystalline in nature and, therefore, not ideal for FFF because of warping and nonhomogeneous crystallization. Consequently, this work aims at exploring alternative amorphous high‐performance polymers. The tensile and flexural mechanical properties of printed samples from PEEK, polyetherketoneketone (PEKK), and polyphenylsulfone (PPSU) according to ISO standards are compared. Testing of specimens obtained from three orthogonal build directions reveals nearly isotropic mechanical behavior (e.g. ultimate tensile strength differed no more than 8% between print orientations). This enables printing of patient‐specific cranial implants in vertical orientation with minimal support structures, which result in dimensional accuracies in the clinically acceptable range for craniofacial reconstructions. Mechanical assessment via an in‐house designed indentation set‐up shows that both PEKK and PPSU should be considered valid alternatives to PEEK for cranial implants. This work showcases the maturity of FFF for high‐performance polymers and leverages it for complex patient‐specific geometries such as a cranial implant.

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Synthetische Kunststoffe

Cited by 7 publications

References 2 publications

Theoretical and experimental validation of critical thermal properties of advanced vacuum bagging for composite manufacturing

Theoretical and experimental validation of critical thermal properties of advanced vacuum bagging for composite manufacturing

Mechanical and Optical Properties of Nanosilica-filled Polycarbonate Composites

Extrusion‐Based Additive Manufacturing of Cranial Implants Using High‐Performance Polymers: A Comparative Study on Mechanical Performance and Dimensional Accuracy

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