Abstract: The present invention provides a reinforcing fiber substrate having a resin material layer containing thermoplastic resin fibers, wherein the occurrence of microcracks caused by the resin material layer is reduced; and the present invention relates to a reinforcing fiber substrate 30 comprising one or more reinforcing fiber layers 330, 340, 350 comprising reinforcing fibers, one or more resin material layers 310 to 316 comprising thermoplastic resin fibers, and auxiliary yarns, wherein the auxiliary yarns maintain the integrity of the reinforcing fiber layer and/or the reinforcing fiber substrate by connecting the reinforcing fibers and/or the reinforcing fiber layers to each other, and wherein the mean fiber diameter of the thermoplastic resin fibers is 0.5 ?m to 35 ?m.

Abstract: A simulation control apparatus includes a control stick that rotates about an axis X1 in both directions, and a reaction force generator including a tension spring that is deformed by rotation of the control stick and generates an operating reaction force of the control stick. The reaction force generator includes a transferer that is connected to the control stick and rotates together with the control stick, a first arm that rotates about an axis X2 and deforms the tension spring when rotation of the control stick in one direction is transferred to the first arm through the transferer, and a second arm that rotates about an axis X2 and deforms the tension spring when rotation of the control stick in another direction is transferred to the second arm through the transferer.

Abstract: A fiber-reinforced composite material contains a resin cured product obtained by curing an epoxy resin composition containing a curing agent A, a curing agent B, a curing agent C, an epoxy resin D, an epoxy resin E, and resin particles F, and a stitched reinforcing fiber base material. The fiber-reinforced composite material enables a fiber-reinforced composite material to be provided that achieves high productivity, and exhibits heat resistance and mechanical properties while using an epoxy resin composition that has low viscosity, a long pot life, and fast curability.

Abstract: An object of the present invention is to provide a stitched fiber-reinforced substrate material capable of suppressing the formation of microcracks in a fiber reinforced composite material. The stitched fiber-reinforced substrate material of the present invention is a stitched fiber-reinforced substrate material formed by stitching reinforcement fiber sheets made of reinforcement fibers using stitching yarns, to which an organic compound having a polar group is adhered. The organic compound having a polar group is preferably a compound having a polyoxyalkylene structure, and also preferably a compound having an epoxy group. The organic compound having a polar group is preferably adhered in an amount of 0.1 to 10 wt % with respect to the mass of the stitching yarn.

Abstract: An epoxy resin composition contains a curing agent A, a curing agent B, a curing agent C, an epoxy resin D, an epoxy resin E, and resin particles F, wherein the curing agent A is an aromatic polyamine having a substituent selected from an alkyl group, an aromatic group, and a halogen group at each of two ortho positions of an amino group, the curing agent B is an aromatic polyamine that is liquid at 25° C., and the curing agent C is an aromatic polyamine having only one electron donating substituent or no substituent at an ortho position of an amino group, the epoxy resin D is constituted by an epoxy resin which is composed of a monomer containing 4 or more glycidyl groups, and the epoxy resin E is constituted by an epoxy resin which is composed of a monomer containing 2 or 3 glycidyl groups.

Abstract: An object of the present invention is to provide a stitched fiber-reinforced substrate material capable of suppressing the formation of microcracks in a fiber reinforced composite material. The stitched fiber-reinforced substrate material of the present invention is a stitched fiber-reinforced substrate material formed by stitching reinforcement fiber sheets made of reinforcement fibers using stitching yarns, to which an organic compound having a polar group is adhered. The organic compound having a polar group is preferably a compound having a polyoxyalkylene structure, and also preferably a compound having an epoxy group. The organic compound having a polar group is preferably adhered in an amount of 0.1 to 10 wt % with respect to the mass of the stitching yarn.

Abstract: An object of the present invention is to provide a stitched fiber-reinforced substrate material capable of suppressing the formation of microcracks in a fiber reinforced composite material. The stitched fiber-reinforced substrate material of the present invention is a fiber-reinforced substrate material formed by stitching reinforcement fiber sheets made of reinforcement fibers using stitching yarns, and the stitching yarn has a linear expansion coefficient in the fiber axial direction of ?1×10?6 to 70×10?6/K after being heated at 180° C. for 2 hours and then cooled. The stitching yarn is preferably a stitching yarn to which an organic compound having a polar group is adhered.

Abstract: An object of the present invention is to provide a stitched fiber-reinforced substrate material capable of suppressing the formation of microcracks in a fiber reinforced composite material. The stitched fiber-reinforced substrate material of the present invention is a stitched fiber-reinforced substrate material formed by stitching reinforcement fiber sheets made of reinforcement fibers using stitching yarns that exhibit an in-plane shear strength transition rate of 5% or more. The stitching yarn is preferably adhered by an organic compound having a polar group.

Abstract: The present invention provides an epoxy resin composition containing: an epoxy resin [A] that is a compound represented by Chemical formula (1) shown below: wherein R1 to R4 each independently represent one selected from the group consisting of a hydrogen atom, an aliphatic hydrocarbon group, an alicyclic hydrocarbon group, and a halogen atom, and X represents one selected from —CH2—, —O—, —S—, —CO—, —C(?O)O—, —O—C(?O)—, —NHCO—, —CONH—, and —SO2—; a bifunctional epoxy resin [B] having an amine type glycidyl group; a curing agent [C] containing an aromatic polyamine, and having at least one substituent selected from an aliphatic substituent, an aromatic substituent, and a halogen atom at an ortho position with respect to an amino group; and a particulate rubber component [D].