Deutsches Zentrum Fuer Luft-Und Raumfahrt E.v

Deutsches Zentrum Fur Luft-Und Raumfahrt E.v.

Lennert Heilmann

The invention relates to a method for producing a test body () for mechanically destructively testing a materially bonded joining connection, wherein the method comprises the following steps:

Method for producing a test specimen

The invention relates to a film adhesive for bonding at least two joint partners, containing an adhesive for an adhesive connection of the joint partners and a flat textile support material. The adhesive is applied onto the flat textile support material in the form of a film, and the flat textile support material has at least one first section which adjoins at least one second section of the support material. The support material of the first section has a modified material and/or is chemically and/or geometrically modified compared to the support material of the second section such that after curing the adhesive, the adhesive connection has a mechanical property in the region of the first section relating to an elongation at break or fracture toughness which differs from the mechanical property of the adhesive connection in the region of the second section.

Film adhesive and method for producing same

The invention relates to a method for applying a material () to a fiber composite component within an application region () of the fiber composite component, the fiber composite component being produced from a fiber composite material having a fiber material () and a matrix material (), the method comprising the following steps: —providing at least one monofilament woven fabric (), in which a plurality of or all threads each consist of a single filament, —arranging the at least one monofilament woven fabric () on a fiber preform () in the application region (), which fiber preform is formed from the fiber material () of the fiber composite material, —curing, in a common process step, the matrix material () of the fiber composite material, which matrix material embeds the fibers material () of the fiber preform (), and a matrix material () embedding the monofilament woven fabric (), thereafter the matrix material () of the fiber preform () and the matrix material () of the monofilament woven fabric () being at least partially cured, —tearing off the monofilament woven fabric () integrally bonded to the fiber preform (), and—applying the material () in the application region () after the monofilament woven fabric () has been torn off.

Method for applying a material to a fiber composite component

A method for inspecting a joining surface () of a substrate, wherein a component is to be adhered to the joining surface of the substrate by means of an adhesive material (), wherein the method comprises the following steps: &#x2022;&#x2014;providing at least one planar test textile (), which has a fiber material () and an adhesive primer (), &#x2022;&#x2014;applying the planar test textile to at least one part of the joining surface of the substrate to which the component is to be adhered so that the adhesive primer of the planar test textile contacts the joining surface of the substrate, &#x2022;&#x2014;at least partially curing the adhesive primer of the planar test textile in order to integrally bond the planar test textile to the substrate by means of the adhesive primer, &#x2022;&#x2014;pulling off the planar test textile after at least partially curing the adhesive primer and inspecting the joining surface by means of a qualitative evaluation of the fracture pattern between the cured adhesive primer and the planar test textile and/or by means of a quantitative evaluation of the pull-off force determined when pulling off the planar test textile.

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Bremen, Germany

Lennert Heilmann