Saab Ab

Saab, Inc.

Jan Vaara

Max Krogager

Mikael Petersson

Björn Weidmann

Anders Westerdahl

Ingemar Turesson

Claes Rudqvist

Mathias Larsson

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

Manufacturing method for trumpet spar and other curved objects

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

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

This invention refers to a method and a device for use in connection with the fabrication of multilayer products () such as composites and bonded multilayer sheet products, ect. by means of the so-called 'bagging technique,' to increase the compressive pressure (P) on the product being created beyond normal atmospheric pressure. In the bagging technique, which is used to join a plurality of different material layers with one another to form a unit via polymeric binder layers, atmospheric pressure is normally used to press the various objects together in that they are enclosed in a depressurized gas-impervious bag () while the various layers are joined to form a unified product. According to the invention, the atmospheric pressure acting upon the outside of the bag is adsorbed by a first material surface () that is larger than the surface of the multilayer product whose intermediate binder layers are to be caused to join together, while a second material surface () facing the opposite direction is used to transfer said composite pressure load (P) to the product to be fabricated. The invention also includes a method and a device for distributing the pressure load () laterally in connection with the fabrication of e.g. a U-channel-shapped object with the help of the wedge effect.

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Linköping, Sweden

Jan Vaara