The fiber-reinforced resin material of the present invention is a fiber-reinforced resin material having a laminated structure in which fiber assembly layers and thermoplastic resin layers are alternately located, wherein the fiber assembly layers are each an assembly of continuous fibers having thermoplastic resin particles attached to surfaces thereof, and the fiber-reinforced resin material has a higher elongation on one surface side than that on the other surface side. The fiber-reinforced resin structure is made of the present fiber-reinforced resin material. A method for manufacturing the present fiber-reinforced resin material includes: a stacking step of stacking a sheet-shaped product of the continuous fibers that serves as the fiber assembly layer and a resin sheet that serves as the thermoplastic resin layer so as to obtain the laminated structure; and a hot-pressing step of heating and compressing a stacked product obtained through the stacking step in a stacking direction.

A propeller includes a plurality of blades that extends outward in a radial direction of a rotation central axis relative to the rotation central axis, and includes an end that is located on an opposite side of the rotation central axis. Each of the plurality of blades has a maximum angle of elevation in a position ranging from 30% to 60% with the rotation central axis as a starting point of a radius of a circle that passes through the end of each of the plurality of blades with the rotation central axis as a center, the maximum angle of elevation being a maximum of an angle of elevation in each of the plurality of blades. A change in the angle of elevation in a longitudinal direction of each of the plurality of blades is within 10 degrees per 5% of the radius. A change in the longitudinal direction of a cross-sectional maximum blade thickness is within 20% of a maximum blade thickness of each of the plurality of blades per 5% of the radius, the cross-sectional maximum blade thickness being a maximum blade thickness in a cross section of each of the plurality of blades, the cross section being orthogonal to the longitudinal direction. A change in a chord length of each of the plurality of blades in the longitudinal direction is within 20% of a maximum of the chord length in each of the plurality of blades per 5% of the radius.

Compositions including a polyimide and one or more thermally conductive fillers, and compaction rollers for an automated fiber placement machine incorporating the compositions are provided. The polyimide may be a polymeric reaction product of a dianhydride and one or more diamines. The one or more diamines may include a fluorine-containing alkyl ether diamine. The one or more thermally conductive fillers may include one or more of a carbon-based filler, boron nitride, a metal, or combinations thereof. The compositions may have a thermal conductivity of from about 0.2 to about 50 Watts per meter Kelvin (Wm.sup.−1 K.sup.−1).

The present disclosure provides a light-weight flexible high-thermal-conductivity nano-carbon composite film and a method for preparing same. The nano-carbon composite film includes a plurality of composite units laminated sequentially. The composite unit includes flexible adhesive layers and a graphene film layer, and the flexible adhesive layers are disposed on both sides of the graphene film layer. The preparation method includes sequentially laminating the composite units and hot pressing to obtain the nano-carbon composite film. The nano-carbon composite film has the characteristics of high thermal conductivity, light weight and flexibility, and has an in-plane thermal conductivity of up to 500 W/m.Math.K or higher, a density of 2.0 g/cm.sup.3 or less, and still a thermal conductivity of 500 W/m.Math.K or higher after the nano-carbon composite film is repeatedly bent by 180° for 50 times while there is no peeling of graphene from the surface.

A method and system for the characterization of equibiaxial compressive strength in 2D woven composites, such as carbon fiber reinforced laminate composites, is disclosed using induced biaxial flexure, the strain measurements from which are used to determine the equibiaxial compressive strength of the composite.

A process for the manufacture of a degradable polycyanurate bulk molding composition includes: contacting a liquid cyanate ester monomer with an additive material and a polymerization catalyst to form a reaction mixture; maintaining a temperature of the reaction mixture at about 80° C. to about 100° C. to form a polycyanurate product having a viscosity of about 120 to about 200 centipoise at 23° C.; heating a reinforcing filler at a temperature of about 50 to about 150° C. to form a pre-heated reinforcing filler; and blending the polycyanurate product with the pre-heated reinforcing filler to form the degradable polycyanurate bulk molding composition. The bulk molding composition can be used to form a degradable polycyanurate article.

A fiber reinforced plastic (FRP) molding system in which FRP material, having stacked prepregs, is molded to manufacture an arc-shaped FRP component. The FRP molding system comprises inner and outer jig plates, a partial pressing device, and transfer devices. The jig plates are arc-shaped members having outer and inner surfaces that respectively fit with inner and outer surface shapes of the FRP component. The FRP material is sandwiched between the jig plates to form an integrated jig plate. The partial pressing device intermittently compresses a portion of the integrated jig plate in a radial direction orthogonal to an arc of the FRP component so that the FRP component is partially molded. The transfer devices intermittently move the compressed portion of the integrated jig plate by the partial pressing device. By repeating the partial pressing and the transport, the entire integrated jig plate is compressed to form the FRP component.

A prepreg consisting cf a fiber reinforcement material and a resin composition containing a bismaleimide resin is molded through a first heating step in which the prepreg is held at a temperature (T.sub.1) equal to or higher than a temperature at which the resin composition exhibits a viscosity of 100 (Pa.Math.s) and equal to or lower than a temperature at which the resin composition exhibits the minimum viscosity for 30 minutes or more, followed by being held at a temperature equal to or higher than a curing temperature of the bismaleimide resin.

The present invention relates to a method for preparing a three-dimensional shaped article, comprising the following steps: a) unfolding the three-dimensional profile of the three-dimensional shaped article with a curved surface via a computer-aided design software; b) dividing the unfolded three-dimensional profile obtained in step a) into several elemental layers via the computer-aided design software; c) cutting a continuous fiber reinforced thermoplastic resin based composite sheet to have the same or similar shape and size with the elemental layers; d) stacking the cut composite sheets in order of size to obtain a stack; and g) forming the stack obtained in step d), followed by demoulding and optionally trimming to obtain the three-dimensional shaped article. With the method of the present invention, a continuous fiber reinforced thermoplastic resin based composite sheet can be processed into a three-dimensional shaped article with uneven thickness and a high degree of curvature. The resulting three-dimensional shaped article features a light weight, good impact resistance and compression resistance.

A fiber-reinforced polymeric composite structure having chemically active thermoset particles positioned in an interlaminar region between adjacent layers of reinforcement fibers and method of making the same. Upon curing of the composite structure, the chemically active functional groups on the thermoset particles form covalent bonds with the matrix resin surrounding the particles. In one embodiment, the particles are formed of a partially cured thermoset polymer with a degree of cure of less than 100%. In another embodiment, the particles are derived from a thermosettable resin composition, wherein the stoichiometry is such that there is a deficiency or an excess in the amount of curing agent that is necessary for reacting with 100% of the thermoset resin component. In some embodiments, the composition of the chemically active thermoset particles is the same or substantially the same as that of the matrix resin of the composite structure.