Saab Ab

Saab, Inc.

Megtec Systems Amal Ab

Saab Composite Aktiebolag

Max Krogager

Mikael Petersson

Björn Weidmann

Jan Vaara

Claes Rudqvist

Anders Westerdahl

Göte Strindberg

Ingemar Turesson

Lars Löfgren

Nils-Gunnar Jaktlund

Mathias Larsson

Jonny Gustavsson

Jervant Ulf

A method for producing an object of composite material comprising the steps of:

Manufacturing method for trumpet spar and other curved objects

The present invention relates to a method for the manufacture of a composite article comprising a composite plate () and at least one fitting (). The method is characterized by the steps of arranging at least one former on said composite plate (), arranging at least one fitting () on said composite plate (), producing a lay-up by applying a composite material layer () least partly covering an external surface of the former and of the fitting, and curing the layup in a curing process. After curing, said composite material layer () forms the walls of a stiffener and at least partly encloses the fitting so as to support it in a predetermined position.

Method for the manufacture of a composite article

A method for manufacturing a contoured composite article. A separation distance of dividing elements of a dividing unit configured to divide a tape comprising fiber is adjusted. The tape is fed through the dividing unit to divide the tape into a plurality of inter-connected or separate, substantially longitudinal strips. The tape is laid onto a surface with an automatic tape laying apparatus.

Automatic tape laying apparatus and method

A curved beam of fiber composite material. The beam includes a first flange curved in a longitudinal direction, a second flange curved in a longitudinal direction and having a greater longitudinal extent than the first flange, and a web curved in a longitudinal direction and extending between the first flange and the second flange. The beam includes a fiber composite laminate including layers of fibers having different fiber directions, wherein a fiber density per unit of area of the second flange is lower than a fiber density per unit of area of the first flange, and wherein the first flange, the second flange and the web are seamless, continuous, and unfolded in a longitudinal direction.

Curved beam of fiber composite material

A method for producing an article of composite material. A female molding tool is provided. A form bag is provided. At least one prepreg is placed in the molding tool. A heel shaped hard tool part. A hard tool part is placed at the female tool close to an edge of the laminate being placed in the mold. The form bag is placed in the female tool so that the bag seals towards the heel shaped tool part, in such a way that, at a later air evacuation of the bag, an increased pressure that the bag will apply towards the laminate reaches a radius before the pressure reaches an edge.

Manufacturing method with vacuum bag

A method for manufacturing an elongate stiffening element and a rigid shell structure integrated with at least one elongate stiffening element. The method includes providing a preformed, form-stable reinforcement member, which has a hat profile with two inwardly directed, opposing flange portions, covering the reinforcement member with a curable composite material to form an external hat profile having outwardly directed flanges, and integrating this assembly with either a curable or preformed shell structure of composite material.

Method of manufacturing an elongate structural element configured for stiffening a shell structure, and a method for manufacturing a rigid shell structure integrated with at least one elongate stiffening element

A method for fabricating a curved beam from fiber composite material. A flat fiber composite laminate including a plurality of layers and at least two different fiber directions is formed. The fiber composite laminate is disposed in contact with a male tool includes a first flange, a second flange and an intermediate web. The male tool is curved in its longitudinal direction with a radius of curvature in such a way that the first flange has a shorter longitudinal extent than the second flange. The fiber composite laminate is brought into contact with and secured to the first flange of the male tool. The male tool and the fiber composite laminate are then rotated relative to one another so that the fiber composite laminate is brought into contact with the intermediate web of the male tool in a first rotational movement, and brought into contact with the second flange of the male tool in a second rotational movement. The fiber composite laminate hardens on the male tool, and the finished beam is separated from the tool. Also a beam of fiber composite material fabricated according to the method.

Method for fabricating a curved beam from composite material

In a method for filling pores between two adjacent layers of a laminate for a component with high demands upon strength and comprising several layers of fibre composite having within each layer substantially parallel fibres embedded in a matrix, a connection path is created, through which a medium may move inside the laminate, between the exterior of the laminate and the pore by exerting the laminate at least in the region of the pore for forces making slots to propagate substantially in the matrix through each laminate layer along the fibre direction of the layer. A flowing, curable material is after that applied at an outer surface of the laminate and this is brought to fill the pore through the connection path. Finally, the material filling the pore is brought to cure.

Repair method

The invention concerns a method for reinforcing a double-shell structure in which a cellular core () is arranged between a first shell () and a second shell (). In the method according to the invention, at least one cavity is formed in the double-shell structure from an opening in the first shell into the cellular core () so that the cavity substantially extends through the cellular core () to the second shell. Fixative () is injected into the cavity. A stiff bar () is introduced into the cavity, whereupon excess fixative () is allowed to pass out of the cavity. Finally, the fixative left in the cavity is cured.

Method for reinforcing a double-shell structure

The present invention provides a method for producing a bending-resistant, elongated body, preferably a shaft or beam. The invention is characterized in that an elongated blank is produced having at least one cavity extending essentially along the entire length of the blank, the inner surface of which cavity is at a distance from the mass center of the blank seen in a section at right angles to its longitudinal axis and that affixed in the cavity is a fiber composite body with an outer surface essentially congruent with the inner surface of the cavity and that majority of the fibers in the fiber composite body both extend essentially parallel to the longitudinal axis of the elongated blank and are elongated along the whole of its length. The invention also relates to an arrangement produced according to the method.

Growing community of inventors

Linköping, Sweden

Max Krogager