Enhancement of strength and uniformity in unidirectionally arrayed chopped strands with angled slits

Taketa, Ichiro; Sato, Narumichi; Kitano, Akihiko; Nishikawa, Masaaki; Okabe, Tomonaga

doi:10.1016/j.compositesa.2010.07.010

Cited by 32 publications

(25 citation statements)

References 24 publications

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“…Most of the thermoplastic prepreg are made of continuous fiber reinforcements and thermoplastic resin (CFRTP). The stretch‐broken fiber reinforcements and thermoplastic resin composites are of significant interest in some aeronautic and automobile applications. These materials offer to some extend the ability for fibers to move relatively to each other .…”

Section: Introductionmentioning

confidence: 99%

Thermo-mechanical behavior of stretch-broken carbon fiber and thermoplastic resin composites during manufacturing

et al. 2014

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Stretch-broken fiber reinforcements and thermoplastic resin commingled prepregs are interesting for manufacturing composite parts in aeronautic and automobile industries. With these materials it is possible to produce composite parts with complex geometries, and high curvatures. On the other hand the length of the fibers leads to mechanical properties of the final composite that are close to those of the composite with continuous fibers. This paper analyzes the thermo-mechanical properties of Stretch Broken Carbon Fiber (SBCF) / PPS and PEEK commingled prepregs during manufacturing. Tensile and in-plane shear tests at different temperatures are analyzed. The experiments are realized in an isothermal oven. The range of temperature is those of the part during a thermoforming process. The experimental data allow to analyze the differences on the tensile and in-plane shear behaviors at different temperatures between thermoplastic prepregs with continuous fibers and thermoplastic prepregs with stretch-broken fibers. Forming simulations show that wrinkling can be avoided with SBCF prepregs while these wrinkles develop during continuous fibers prepreg forming. POLYM. COMPOS., 36:694-703, 2015.

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Section: Introductionmentioning

confidence: 99%

Thermo-mechanical behavior of stretch-broken carbon fiber and thermoplastic resin composites during manufacturing

et al. 2014

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“…Therefore, it is necessary to clarify mechanical properties and failure mechanism of UACS laminates with an open hole under different load conditions, as well as the relationship between the strength and the size of open holes, before the wide application of UACS laminates. As seen from previous research [7][8][9][10][11][12], it could be concluded that UACS laminates with bi-angled slits have the best mechanical properties, including tensile strength, compression strength, specific energy absorption, and flowability during curing, among the existing four kinds of UACS laminates. Therefore, in this study, open-hole UACS laminates with regularly arrayed bi-angled slits were fabricated based on the continuous CFRP prepreg using a commercial numerical control cutter.…”

Section: Introductionmentioning

confidence: 75%

“…Therefore, the full utilization of high strength properties of carbon fiber is not satisfactory for this kind of UACS. After that, Taketa et al improved the design scheme of the initial UACS and proposed the continuous slit with a small angle ( Figure 1 b) [ 8 , 9 ]. The proposed angled continuous slit reduced the normal stress at the slit compared to the initial UACS laminate under the same tensile load, thus improving the strength of the UACS laminate.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Research on Open-Hole Strength and Damage Mechanism of Regularly Arrayed Short Fiber Reinforced Polymer Composite

Zhang

Chen

et al. 2020

Polymers

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Laminates with unidirectionally arrayed chopped strands (UACS) are one of the advanced short fiber reinforced polymer composites (SFRP) with significant application prospect, which greatly improves mechanical properties compared to the traditional SFRP, meanwhile ensuring excellent flowability. In practice, composite laminate with an open hole is one of the typical connective components, and it is necessary to clarify the allowable load and damage tolerance performance of notched structures. In the present study, UACS laminates were fabricated using the continuous carbon fiber reinforced polymer (CFRP) prepreg, on which regularly arrayed bi-angled slits were introduced by a commercial numerical control cutter. The tensile strength and strain distribution around the open hole of the notched UACS laminate were experimentally investigated, while the damage progression near the open hole of the notched UACS laminate was analyzed by the finite element method (FEM). The tensile strength of the notched UACS laminate was measured at 298 MPa, which is about 60% of the strength of the unnotched UACS laminate. The simulation results match well with the experimental results, although there is a little overestimate on strength, by about 5% and 7%, for unnotched and notched UACS laminates, respectively. The final critical failure mode for the notched UACS laminate is mainly dominated by the delamination instead of the fiber breakage in the unnotched UACS laminate.

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“…Extensibility needs to be incorporated into the tow to provide more deformation modes to permit forming of fully clamped sheets and open out the manufacturing options. Various options have been tried in this area [16] and more work is needed to balance manufacturing and performance requirements. Current matrices contribute to defects through cure shrinkage and high thermal expansion coefficients.…”

Section: 7mentioning

confidence: 99%

Manufacturing defects as a cause of failure in polymer matrix composites

Potter

2012

Failure Mechanisms in Polymer Matrix Composites

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Enhancement of strength and uniformity in unidirectionally arrayed chopped strands with angled slits

Cited by 32 publications

References 24 publications

Thermo-mechanical behavior of stretch-broken carbon fiber and thermoplastic resin composites during manufacturing

Thermo-mechanical behavior of stretch-broken carbon fiber and thermoplastic resin composites during manufacturing

Experimental and Numerical Research on Open-Hole Strength and Damage Mechanism of Regularly Arrayed Short Fiber Reinforced Polymer Composite

Manufacturing defects as a cause of failure in polymer matrix composites

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