New designs of unidirectionally arrayed chopped strands by introducing discontinuous angled slits into prepreg

Li, Hang; Wang, Wen Xue; Takao, Yoshihiro; Matsubara, Terutake

doi:10.1016/j.compositesa.2012.09.009

Cited by 30 publications

(30 citation statements)

References 17 publications

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“…Immersion density tests checks performed on the material relayed an average density of 1.56 g/cm 3 , in agreement with the value provided by the manufacturer and, alongside the inspection of several flawless cross-sections give confidence in the absence of significant voidage. This approach was repeated for the manufacture of the final samples, with the precharges being weighed before being placed in the mould as per the sample approach being investigated.…”

Section: Hot Press Forming Methodologysupporting

confidence: 79%

“…A number of significant problems exist with the manufacture of thick composite components from DFMCs including achieving a constant temperature throughout the mould and material loft. Initial tests have shown a consolidation of $650% from the raw to the moulded state, with raw material filling a volume of 400 cm 3 for resulting in a compacted plate with a volume of 60 cm 3 . If a part were to be formed in a single shot the mould would therefore necessarily have a raw material feed-in region (or throat) up to 7 times larger than final part.…”

Section: Precharged Componentsmentioning

confidence: 99%

“…A simple answer to both problems is to somehow orientate the fibers. Orientated short fiber composites can have mechanical properties verging on those of long fiber composites [1][2][3] and the control of fiber orientation would naturally lead to a reduction in variability. The problem with this is the increased complexity of orientating thousands of individual fibers, a process which itself is limited and further complicated by the thermoset resins typically used in industry.…”

Section: Introductionmentioning

confidence: 99%

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The use of discontinuous PEEK/carbon fiber thermoplastic moulding compounds for thick-section componentry

Erland

Savage

2019

Advanced Manufacturing: Polymer & Composites Science

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The hot-pressing of discontinuous fiber moulding compounds (DFMCs) is an established way of forming geometrically complex components, however, it is not a simple process. Rapid and irreversible cure cycles hinder the use of thermoset resins, and thermoplastic resins offer inferior mechanical performance. The recent availability of DFMCs utilising a Polyether Ether Ketone (PEEK) matrix offer an alternative, combining the usability of thermoplastics with significantly enhanced mechanical properties. A novel manufacturing approach is proposed and investigated, in which virgin material is consolidated into multiple 'pre-charges' prior to pressing the final component, combating the limitations of DFMCs; loft, voidage and fiber orientation. Short beam shear tests were employed to assess the mechanical implications of laminating DFMCs, demonstrating minimal differences to a standard sample. Three-point bend tests assessed rudimentary orientation of fiber bundles, showing significantly improved mechanical performance at the cost of toughness. A novel method to determine the interlaminar shear modulus is also presented and successfully validated.

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Section: Hot Press Forming Methodologysupporting

confidence: 79%

Section: Precharged Componentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The use of discontinuous PEEK/carbon fiber thermoplastic moulding compounds for thick-section componentry

Erland

Savage

2019

Advanced Manufacturing: Polymer & Composites Science

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“…Li et al [26] developed the same concept further by introducing new slit patterns to improve the strength, material symmetry and flowability of UACS. The scope of previous studies on discontinuous prepregs was either interlaminar damage and failure characterisation or improvement of the flow-or formability of continuous UD prepregs.…”

Section: Introductionmentioning

confidence: 97%

Demonstration of pseudo-ductility in unidirectional hybrid composites made of discontinuous carbon/epoxy and continuous glass/epoxy plies

Czél¹,

Jalalvand

Wisnom

2015

Composites Part A: Applied Science and Manufacturing

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A new, partially discontinuous architecture is proposed to improve the mechanical performance of pseudo-ductile, unidirectional (UD) interlayer carbon/glass hybrid composites. The concept was successfully demonstrated in different laminates with high strength and high modulus carbon and S-glass epoxy UD prepregs. The novel hybrid architecture provided pseudo-ductile tensile stress-strain responses with a linear initial part followed by a wide plateau and a second linear part, all connected by smooth transitions. The best hybrid configuration showed 60% improvement in modulus compared to pure glass, 860 MPa plateau stress and 2% pseudo-ductile strain. The initial modulus, the plateau stress and the overall tensile stress-strain response of each specimen configuration were predicted accurately

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“…They found that the ICF laminates maintain high mechanical properties after forming to complex shapes. Li et al [6] proposed two newly designed ICF prepregs with discontinuous staggered angled ICFs and discontinuous bi-angled ICFs. Li et al [7] also studied the damage progression in three kinds of ICF quasi-isotropic (QI) laminates under tension by finite element simulation based on a multiscale analysis.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behavior of Open-Holed CFRP Laminates with Initially Cut Fibers

Sudarsono¹,

Ogi²

2017

OJCM

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Carbon fiber-reinforced plastic (CFRP) laminates with initially cut fibers (ICFs) have good formability without large degradation of static strength; however, their fatigue behavior has not been investigated thus far. In this paper, we investigated fatigue behavior and damage progress of open-holed CFRP laminates with ICFs having interlayers. Three types of CFRP laminates were employed: a laminate without ICF fabricated using an autoclave (Continuous-A), a laminate with ICF fabricated using an autoclave (ICF-A) and a laminate with ICF fabricated using press molding (ICF-P).First, fatigue test was conducted to obtain S (maximum stress)-N (the number of cycles to failure) curves in order to reveal fatigue strength. The fatigue tests for several specimens were interrupted at three prescribed numbers of cycles to observe damage progress. It is found that the Continuous-A laminate shows little strength degradation in the S-N curve while fatigue strength in both ICF laminates is decreased by approximately 30% at N of 10 6 . In contrast, the damage progress of the ICF-P laminate is the least among the three laminates while the delamination progress at both edges and around the hole in the Continuous-A laminate is the most prominent.

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New designs of unidirectionally arrayed chopped strands by introducing discontinuous angled slits into prepreg

Cited by 30 publications

References 17 publications

The use of discontinuous PEEK/carbon fiber thermoplastic moulding compounds for thick-section componentry

The use of discontinuous PEEK/carbon fiber thermoplastic moulding compounds for thick-section componentry

Demonstration of pseudo-ductility in unidirectional hybrid composites made of discontinuous carbon/epoxy and continuous glass/epoxy plies

Fatigue Behavior of Open-Holed CFRP Laminates with Initially Cut Fibers

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