Tension-tension and compression-compression fatigue behavior of an injection-molded short-glass-fiber/poly(ethylene terephthalate) composite

Malzahn, J.C.; Schultz, J. M.

doi:10.1016/0266-3538(86)90071-0

Cited by 16 publications

(8 citation statements)

References 13 publications

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“…The predicted values are around 1.5 times the measured values. In another study [19] on glass fibrereinforced PET, the predicted tensile strengths have been found to be 2.5 times the observed values. The overestimation arises from the assumptions of uniform fibre alignment and of flaw-free mouldings in the equations employed.…”

Section: Et/emmentioning

confidence: 64%

Fibre orientation and mechanical behaviour in reinforced thermoplastic injection mouldings

Akay

Barkley

1991

J Mater Sci

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Process variables, fibre orientation distribution and mechanical properties were inter-related for injection-moulded short-glass fibre-reinforced polypropylene and polyamide and long-glass fibre-reinforced polyamide. The properties of the reinforced grades were also contrasted with those of the base polymer. A rectangular mould with triple pin-edge gates on the same side to facilitate a single melt flow-front or double flow-front advancing adjacently, was employed. Mouldings were evaluated for fibre orientation distribution, and tensile, dynamic mechanical and fracture properties. The relative magnitudes of the shell and the core fibre-orientation persuasions depended on the melt and the mould temperatures, and the injection ram speed. An increase in Go, Kc, ultimate tensile strength (UTS) and elastic moduli values and a decrease in tan ~5 values were observed with fibre reinforcement. The properties showed marked sensitivity to the position of the specimens in the moulding because of the associated variations in the fibre orientation. The prediction of UTS based on arute of mixture relationship for strength and the Halpin-Tsai equations for elastic moduli had limited success. The predictions were improved by employing measured data representative of regions of high fibre orientation, e.g. knit-line. The estimation was weakened in the material systems containing significant production-induced voids. An inference of the fracture toughness values was that the composites contained flows of the order of 0.2 mm in size, which is conceivable, either as voids or as defects introduced in the machining of the specimens.

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Section: Et/emmentioning

confidence: 64%

Fibre orientation and mechanical behaviour in reinforced thermoplastic injection mouldings

Akay

Barkley

1991

J Mater Sci

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“…5 Tabbed specimens with a reduce gauge length between the grips are used in some studies to reduce the risks of buckling under compression. 7,8 The first objective of this paper is to present a protocol to perform well-controlled cyclic compression tests and obtain reliable stress, strain, and temperature data. In order to avoid any bias induced by anti-buckling devices (friction, inertia, rotation of the fixing elements, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Non‐standardized anti‐buckling devices are also used sometimes 5 . Tabbed specimens with a reduce gauge length between the grips are used in some studies to reduce the risks of buckling under compression 7,8 . The first objective of this paper is to present a protocol to perform well‐controlled cyclic compression tests and obtain reliable stress, strain, and temperature data.…”

Section: Introductionmentioning

confidence: 99%

Fatigue of short carbon fiber reinforced PEEK under compression: Influence of the load ratio and predictions from heat buildup measurements

Kwiatkowski

Saux

et al. 2023

Fatigue Fract Eng Mat Struct

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Few works investigate the fatigue of short fiber reinforced thermoplastics under cyclic compression. Furthermore, the heat buildup approach to quickly predict the fatigue lifetime of these materials has not yet been investigated for compression-compression loadings. This paper first describes an experimental protocol to perform well-controlled cyclic compression tests without antibuckling device that may induced bias. The uniaxiality of the global loading is checked during the test based on kinematic and thermoelastic coupling field measurements. Then, the paper compares the results from fatigue and heat buildup tests performed on polyetheretherketone reinforced with 30 wt% of short carbon fibers for several load ratios. It is shown that the fatigue lifetime is higher in compression than in tension and depends on the compression load ratio. The heat buildup approach appears to be relevant to quickly predict the fatigue lifetime of the material for the different loading ratios studied, including compression-compression.compression, fatigue, self-heating, short fiber reinforced thermoplastics Highlights• Protocol to perform well-controlled compression tests based on field measurements.• Influence of load ratios on fatigue lifetime of PEEK CF30 under compression loadings.• Quick prediction of fatigue lifetime from heat buildup measurements in compression.

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“…The various topics of fracture and fatigue of glass-fiber-reinforced polyamide (PA) and PET-based plastics have been discussed in [1][2][3][4][5][6][7][8]. Largest portion of these investigations was oriented on fatigue performance of various polyamides (PA 6, PA 66, PA 46, etc.)…”

Section: Introductionmentioning

confidence: 99%

“…Largest portion of these investigations was oriented on fatigue performance of various polyamides (PA 6, PA 66, PA 46, etc.) and significantly less studies were oriented on fatigue of PET [2,3,7,8]. The number of published article on low cycle fatigue of plastics is very limited.…”

Section: Introductionmentioning

confidence: 99%

Plastics Part Design: Low Cycle Fatigue Strength of Glass-fiber-reinforced Polyethylene Terephthalate (PET)

Kagan

Palley

Jia

2004

Journal of Reinforced Plastics and Composites

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This paper summarizes our extensive investigation on the low cycle (up to Nf1/4 5 10 4, where Nf is the number of cycles to failure) fatigue behavior of short glass-fiber-reinforced poly(ethylene terephthalate), or PET, thermoplastic [PET - Thermo plastic polyester for injection molding]. The modes of fatigue test include tension-tension, compression-compression, four-point bending (flexural) - all at frequency f 1/4 1-3 Hz, and flexural fatigue at f 1/4 30 Hz (ASTM D-671). All tests were stress-controlled with stress ratio R 1/4 Smin/Smax1/4 0.1, except for flexural fatigue at f 1/4 30 Hz where stress ratio R 1/4 1. The fracture surfaces of tested specimens were analyzed using scanning electronic microscopy (SEM). The results from this investigation provide comprehensive, up-to-date information and recommendations concerning methods for fatigue testing of injection-molded specimens and models, prediction and optimization of low cycle fatigue properties that play a key role in determining a highly stressed plastic parts life and end-use performance, preselection of PET-based plastic for various industrial applications.

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Tension-tension and compression-compression fatigue behavior of an injection-molded short-glass-fiber/poly(ethylene terephthalate) composite

Cited by 16 publications

References 13 publications

Fibre orientation and mechanical behaviour in reinforced thermoplastic injection mouldings

Fibre orientation and mechanical behaviour in reinforced thermoplastic injection mouldings

Fatigue of short carbon fiber reinforced PEEK under compression: Influence of the load ratio and predictions from heat buildup measurements

Plastics Part Design: Low Cycle Fatigue Strength of Glass-fiber-reinforced Polyethylene Terephthalate (PET)

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