A torsional test method to characterize the multi-level interface properties between carbon fibers and resins of surface-grown carbon nanomaterials
A nano-carbon material and surface growth technology, applied in the direction of analyzing materials, measuring devices, strength characteristics, etc., can solve the problems of characterizing the torsional performance of carbon fiber dipped multifilaments, improve dimensional uniformity, improve accuracy, and eliminate internal pores. Effect
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[0077] In the present invention, the preparation method of the torsion sample preferably includes: using scissors to cut a plurality of strips with a width of L c , the length is L p Use sandpaper to polish the two ends of the dipped multifilament L c length section and apply cured glue to L c Length section and stick the tape; rotate the cut dipped multifilament in the radial direction so that the paper strip is wound around the end of the cut dipped multifilament. After the winding is completed, the obtained sample is placed in a constant temperature and humidity environment.
[0078] In the present invention, the length L of the paper strip p The range is preferably 40mm to 80mm; when the thickness of the paper strip is large, L p can be relatively reduced.
[0079] In the present invention, the material of the paper strip is preferably a paper with good glue permeability, and further preferably includes white newspaper, thin rice paper, filter paper or printing paper....
Embodiment 1
[0098] In a beaker, 100g E51 epoxy resin, 84g BC126 curing agent and 184g acetone were prepared into a resin solution and stirred evenly. Use a syringe with a volume scale accuracy of 0.01mL to draw the prepared resin solution for use. Selected 12K Toray T700S carbon fiber with surface grown graphene nanosheets, its linear density ρ f is 0.798g / m, the distance l between the two ends of the used tow winding frame is 0.3m, and the desired mass fraction of resin in the dipped multifilament is m f is 0.7, the mass fraction ω of the resin in the above-configured resin solution is 0.5, and the density of the resin solution is 0.953 g / cm 3 , the above parameters are substituted into formula 1, and the volume V of the resin solution dripped by each fiber tow is calculated. r for:
[0099]
[0100] Apply a little tension to wind the dry fiber tow on an adjustable length tow winding frame with an initial distance l of 300mm at both ends, fix both ends of the fiber tow on the windin...
Embodiment 2
[0109] In a beaker, 50g TDE85 epoxy resin, 30g DDS curing agent and 120g acetone were prepared into a resin solution and stirred evenly. Use a syringe with a volume scale accuracy of 0.01mL to draw the prepared resin solution for use. In order to study the effect of surface-grown carbon nanotubes on the mechanical properties and interface matching characteristics of carbon fibers, T800H carbon fibers with 12K surface-grown carbon nanotubes were selected, and the linear density ρ f is 0.465g / m, the distance l between the two ends of the used tow winding frame is 0.35m, and the desired mass fraction of resin in the dipped multifilament is m f is 0.6, the mass fraction ω of the resin in the above-configured resin solution is 0.4, and the density ρ of the resin solution r 0.915g / cm 3 , substitute the above parameters into formula (1), calculate the volume V of the resin solution dripped by each fiber tow r for:
[0110]
[0111]The T800H carbon fibers with surface-grown carb...
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