Mechanical properties of foamed long glass fiber reinforced polyphenylene sulfide integral sandwich structures manufactured by direct thermoplastic foam injection molding

Lohr, Christoph; Beck, Björn; Henning, Frank; Weidenmann, Kay André; Elsner, Peter

doi:10.1016/j.compstruct.2019.03.056

Cited by 24 publications

(18 citation statements)

References 10 publications

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“…The overall processing with the injection molding machine and mold lead to minimal fiber breakage compared to the ∼280 µm initial fiber length of the granules. This has to be attributed to the large hot runner system and the injection gate described in Lohr et al., 15,16 which offer minimal flow resistance effectively leading to reduced shear stress upon the fibers. Even though the injection gap at the high-pressure injection molding process is 1 mm smaller than for the low-pressure process, the fiber length remains at the same level.…”

Section: Resultsmentioning

confidence: 99%

“…It was described in detail in the preliminary publications of the authors and is also shown in Figure 2. 15,16…”

Section: Methodsmentioning

confidence: 99%

“…The lower gate is used for the injection in order to create a uniform melt flow as shown in Lohr et al. 15 for extraction of the specimen. The dimensions of the blanks are 250 mm × 500 mm × 4 mm for the final part thickness.…”

Section: Methodsmentioning

confidence: 99%

“…are foamed during injection molding. 13–19 The group of Liu et al. 20 utilized the MuCell injection molding technology (low-pressure) to manufacture microcellular foam structures.…”

Section: Introductionmentioning

confidence: 99%

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Process comparison on the microstructure and mechanical properties of fiber-reinforced polyphenylene sulfide using MuCell technology

Lohr

Beck

Henning

et al. 2018

Journal of Reinforced Plastics and Composites

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The MuCell process is a special injection molding process which utilizes supercritical gas (nitrogen) to create integral foam sandwiches. The advantages are lower weight, higher specific properties and shorter cycle times. In this study, a series of glass fiber-reinforced polyphenylene sulfide foam blanks are manufactured using the MuCell injection molding process. The different variations of the process (low-pressure also known as structural foam injection molding) and high-pressure foam injection molding (also known as “core back expansion,” “breathing mold,” “precision opening,” decompression molding) are used. The sandwich structure and mechanical properties (tensile strength, bending strength, and impact behavior) of the microcellular and glass fiber-reinforced polyphenylene sulfide foams are systematically investigated and compared to compact material. The results showed that the injection parameters (injection speed, foaming mechanism) played an important role in the relative density of microcellular polyphenylene sulfide foams and the mechanical properties. It could be shown that the specific tensile strength decreased while increasing the degree of foaming which can be explained by the increased number of cells and the resulting cell size. This leads to stress peaks which lower the mechanical properties. The Charpy impact strength shows a significant dependence on the fiber orientation. The specific bending modulus of the high-pressure foaming process, however, surpasses the values of the other two processes showing the potential of this manufacturing variation especially with regard to bending loads. Furthermore, a high dependence of the mechanical properties on the fiber orientation of the tested specimens can be found.

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Section: Resultsmentioning

confidence: 99%

“…It was described in detail in the preliminary publications of the authors and is also shown in Figure 2. 15,16…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…are foamed during injection molding. 13–19 The group of Liu et al. 20 utilized the MuCell injection molding technology (low-pressure) to manufacture microcellular foam structures.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Process comparison on the microstructure and mechanical properties of fiber-reinforced polyphenylene sulfide using MuCell technology

Lohr

Beck

Henning

et al. 2018

Journal of Reinforced Plastics and Composites

Self Cite

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show abstract

“…The significant enhancement of the tensile strength can be attributed to the increase in the length of the reinforcing fibers, and the structure of the reinforced fiber preform. Increasing the length of the reinforced fibers helps to improve the mechanical properties of the paper-based friction material [39,40]. In addition, the intertwined entanglement of the NWF mitigates the pulling effect between fibers.…”

Section: Literature Comparison and Future Perspectivesmentioning

confidence: 99%

A new kind of resin-based wet friction material: Non-woven fabrics with isotropic fiber networks as preforms

Zhou

Yin

et al. 2020

Friction

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As an alternative to short fibers, non-woven fabrics (NWFs) were made using different types of long fibers to optimize the performance of paper-based friction materials and their technology. In this investigation, the fillers and resin were impregnated into these NWFs to prepare three kinds of wet friction material. The tribological, mechanical, and thermal properties of the new wet friction material were studied. The results indicate that the dynamic friction coefficient of the new friction material is approximately 0.12 and the static friction coefficient is approximately 0.15; the better wear rate is 0.81334 × 10 −14 m 3 •(N•m) −1. In addition, the temperature for 10% mass loss yielded 100 °C enhancement and the tensile strength was improved by 200%, compared to previously reported values. Most importantly, the advantages include a simple preparation flow, low cost, and resource conservation. This is a promising approach for the future development of paper-based friction materials.

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Thermal aging performance of glass fiber/polyphenylene sulfide composites in high temperature

Wang

Ding

et al. 2021

J of Applied Polymer Sci

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In order to use the glass fiber reinforced polyphenylene sulfide composites (GF/PPS) in high temperature environments, thermal aging performance of two kinds of commercial grade PPS composites, reinforced by 40% glass fiber, PPS‐G40 HM and 1140L4, in thermal aging temperature of 250°C was compared by tensile strength, oxidized layer, color, crystallization and melting behavior. The results showed that tensile strength of GF/PPS composites is significantly decreased with increasing of aging time below 200 h and the tensile strength of aged PPS‐G40 HM is higher than that of aged 1140L4. The thickness of dark color area is increased with increasing of aging time. The thickness of oxidized layer of 1140L4 is thinner than that of PPS‐G40 HM. However, the color of oxidized layer of PPS‐G40 HM is lighter than that of 1140L4. The recrystallization in thermal aging results in the formation of crystal with higher melting point and increased melting temperature of GF/PPS composites. It is found that addition of epoxy resin can increase the initial mechanical property and improve the thermal aging performance of GF/PPS composites. A novel modified GF/PPS composite with higher thermal aging properties was obtained.

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Mechanical properties of foamed long glass fiber reinforced polyphenylene sulfide integral sandwich structures manufactured by direct thermoplastic foam injection molding

Cited by 24 publications

References 10 publications

Process comparison on the microstructure and mechanical properties of fiber-reinforced polyphenylene sulfide using MuCell technology

Process comparison on the microstructure and mechanical properties of fiber-reinforced polyphenylene sulfide using MuCell technology

A new kind of resin-based wet friction material: Non-woven fabrics with isotropic fiber networks as preforms

Thermal aging performance of glass fiber/polyphenylene sulfide composites in high temperature

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