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Case Reports
. 2022 Jan 14;15(2):619.
doi: 10.3390/ma15020619.

Hybrid Prepreg Tapes for Composite Manufacturing: A Case Study

Mohanapriya Venkataraman  1 , Jiří Militký  1 , Alžbeta Samková  1 , Daniel Karthik  1 , Dana Křemenáková  1 , Michal Petru  2
Affiliations
Case Reports

Hybrid Prepreg Tapes for Composite Manufacturing: A Case Study

Mohanapriya Venkataraman et al. Materials (Basel). .

Abstract

The aim of this research was the preparation and characterization of hybrid prepreg tapes from glass multifilament roving (circular cross-section). The fiber, roving, and tape strength distribution was characterized by exploratory data analysis tools (especially quantile-quantile plot) and modeled by the three parameters' Weibull distribution. For estimation of Weibull model parameters, the noniterative technique based on the so-called Weibull moments was used. It was shown that the prepared hybrid prepreg tapes prepared by controlled mechanical spreading technology developed by the authors improved mechanical tensile properties and can be used for the preparation of composites of complicated forms by robotic winding.

Keywords: Weibull distribution; controlled spreading; glass multifilament; hybrid; prepreg tapes; roving; tensile properties.

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Figures

Figure 1
Figure 1
Geometry of (a) roving and (b) tape.
Figure 2
Figure 2
Robotized winding by using hybrid tapes (developed at TUL).
Figure 3
Figure 3
(a) Typical spreading system; (b) principle of mechanical spreading [18].
Figure 4
Figure 4
Semi-operating device for preparing a prepreg (© Global Science Press) [20].
Figure 5
Figure 5
Honeycomb structure [27]. (a) 1 + 6+12 + 18 + …m (i). (b) Close honeycomb. (c) Open honeycomb. Limit packing density μhm  =0.907.
Figure 6
Figure 6
Idealized spreading process (a) a = 4d, b = 3d (b) a = 6d, b = 2d (c) a = 10d, b = d [27].
Figure 7
Figure 7
Dependence of tape width on thickness under different assumptions.
Figure 8
Figure 8
Material SL and SLT (a) glass filaments cross-section, (b) prepreg tape cross-section, (c) longitudinal view of roving, (d) longitudinal view of prepreg tape.
Figure 9
Figure 9
Histogram characterized by experimental distribution of filament strength (red curve is the probability density of normal distribution).
Figure 10
Figure 10
Q-Q graphs for data normality verification (red line is the ideal shape for normal distribution).
Figure 11
Figure 11
Experimental distribution of roving strength (red curve is the probability density of normal distribution).
Figure 12
Figure 12
Q-Q graph for data normality verification (red line is an ideal shape for normal distribution).
Figure 13
Figure 13
Experimental distribution of tape strength (red curve is the probability density of normal distribution).
Figure 14
Figure 14
Q-Q graph for data normality verification (red line is the ideal shape for normal distribution).
See this image and copyright information in PMC

References

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