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Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Ulf Waag

Lothar Schneider

Frank Bretschneider

Olaf Andersen

Guenter Stephani

Gustav Zouhar

Horst Kuhnicke

Juergen Brueckner

Paul Hunkemoeller

Herbert Stephan

The invention relates to hollow balls having shells comprising a sintered inorganic material, such as metals, metal oxides or ceramic, and to methods for producing lightweight structural components using such hollow balls. According to the object of the invention, the application area is to be widened, processing to form structural components is to be made technologically simpler and the properties of the hollow balls and of the structural components produced therewith are to be improved for specific applications. For this purpose, an additional solid functional layer is formed on a shell on the hollow balls. The functional-layer material can then be made able to flow and plastically and/or elastically deformed as a result of a physical and/or chemical treatment.

Hollow balls and a method for producing hollow balls and for producing light-weight structural components by means of hollow balls

The invention relates to components made from ductile metallic materials, and to a method with which deformation or the load acting on these materials is to be determined by means of acoustic emissions analysis. For this purpose, a particulate substance which is brittle at least in the temperature range below 400&deg; C. is added to the ductile metallic material, which may preferably be a weldable structural steel, but may also be a ductile light metal alloy (e.g. aluminum alloy), in order to intensify the acoustic emissions behavior. The particles should be brittle at least in the temperature range of use of the component in question, e.g. at room temperature. It is advantageous if the particles are also plastically deformable in the forming temperature range, so that a certain structure (elongate or acicular) of the particles can be achieved, for example during cold work-hardening.

Components made of ductile metallic material and method for determining deformations and/or strains by means of sound emission analysis

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Dresden, Germany

Ulf Waag