The present invention relates to a part of a luggage system, in particular a shell of a hard-shell case or trolley, comprising a natural fiber material. The present invention further relates to a method for the manufacture and a method for the repair of such a part. A part of a luggage system is provided which comprises a fiber-reinforced material, wherein the fiber-reinforced material comprises a natural fiber material and a matrix material. The natural fiber material comprises at least one set of unidirectional fibers which are embedded in and/or impregnated with the matrix material.

A fiber composite material component has fiber bundles and a matrix of thermoplastic and/or thermosetting material. The fiber bundles are arranged such that they form a profile. Bracing structures are arranged between the fiber bundles. At least two fiber bundles are arranged in a skewed manner with respect to one another and at least one cavity is formed in the region of the intersection of the skewed fiber bundles. Furthermore, a method for producing a fiber composite material component having fiber bundles and a matrix of thermoplastic and/or thermosetting material, is provided.

Ballistic resistant sheets (12), articles (10) comprising such sheets and methods of making the same are provided. The embodiments are especially adapted to facilitate the manufacture of curved ballistic resistant articles (e.g. curved ballistic resistant armor, helmets and the like). In preferred forms, the ballistic resistant sheets are a multi-monolayer construction including a core layer (12-1) formed of at least one first monolayer having first unidirectionally oriented reinforcing fibers and an elastomeric matrix material which is sandwiched between respective face layers (12-2) each formed of at least one second monolayer having second unidirectionally oriented reinforcing fibers and a non-elastomeric matrix material.

A method is of designing a composite material that includes stacked reinforced fiber substrates and has a thickness-varying part whose thickness in a stacking direction changes from a large thickness to a small thickness. The method includes setting, as a cut substrate, the reinforced fiber substrate that has the drop-off portion and is positioned between a base substrate and a cover substrate in the stacking direction; performing stress analysis on the base substrate, the cut substrate, and the cover substrate to calculate an evaluation value concerning stress on the cut substrate; and setting, as the cut substrate, a reinforced fiber substrate in the thickness-varying part, based on the calculated evaluation value.

A composite test coupon includes a plurality of plies. The plurality of plies include first ply layers and second ply layers. The first ply layers have first fibers and a substantially uniform matrix material associated with the first fibers. The second ply layers have second fibers and a pre-stressed matrix material associated with the second fibers. The first fibers are oriented in a first direction, and the second fibers are oriented in a second direction that is different from the first direction. The pre-stressed matrix material includes stress induced cracks between the second fibers of each of the second ply layers.

An iron golf club having high compatibility of a head and a shaft and good grasp of a ball is provided. An iron golf club includes a head, a shaft and a grip. A head gravity center distance that is a distance between a center of gravity of the head and an axis of the shaft is Db (mm), and a shaft torque of the shaft is Ts (). Here, Db is 37 mm or more. In addition, Ts is less than 4.0. Further, Db/Ts is 9.7 or more. The iron golf club has good grasp and excellent driving distance performance.

In a manufacturing method of a resin composite plate for manufacturing a resin composite plate by heating under pressure a resin sheet group having a plurality of fiber-reinforced thermoplastic resin sheets stacked together, and thereby integrating the resin sheet group into one resin composite plate, the fiber-reinforced thermoplastic resin sheets each containing fibers arranged in one direction, the resin composite plate having a desired thickness is manufactured by stacking the plurality of fiber-reinforced thermoplastic resin sheets having different thickness.

A device for producing textile planar structures formed of a plurality of portions deposited beside one another of fiber rovings. A supply device provides a fiber rovings at a transfer installation. A plurality of path guiding rails are disposed beside one another and above the depositing face. A gripper unit and a cutting unit are disposed on each path guiding rail. Each gripper unit and each cutting unit is movable and positionable along the path guiding rail independently of the gripper units and cutting units of the other path guiding rails. The gripper units grab the fiber roving from the transfer installation and move their free end to a desired terminal position. The cutting units severs the rovings at a cutting position. The gripper units and the cutting units have a downholder for pressing the fiber roving against the depositing face.

A method of manufacturing a gas tank comprises: a step (a) of preparing a liner having a hollow cylindrical shape; a step (b) of forming a first layer by winding a first fiber bundle impregnated with resin around the liner; a step (c) of forming a second layer by winding a second fiber bundle impregnated with resin around the liner with the wound first fiber bundle in such a manner that portions of the second fiber bundle overlap each other in a direction parallel to a center axis of the liner; a step (d) of causing a section where the portions of the second fiber bundle overlap each other to get into the first layer; and a step (e) of curing the resin.

A system is disclosed for additively manufacturing a composite structure. The system may include a print head configured to receive a continuous reinforcement, and at least one of a matrix jet and a matrix bath configured to wet the continuous reinforcement with a liquid matrix during passage through the print head. The system may also include a coating mechanism configured to dispense at least one of metallic and ceramic particles onto the wetted continuous reinforcement during passage through the print head, and at least one cure enhancer configured to at least one of cure the liquid matrix and cause the at least one of metallic and ceramic particles to coalesce around the continuous reinforcement. The system may further include a support configured to move the print head in multiple dimensions during discharging.