b.ypar

The table made of basalt fibers

The table b.ypar is in its design and its name as well as material and structure a combination of basalt + hypar. As a lightweight construction made of basalt fiber reinforced plastic the prototype serves the digital form finding and the innovative, technologically accurate and at the same time artisan manufacturing process.

Keywords: Doppelte Krümmung, komplexe Geometrie, Hyparflächen, Faserverstärkter Kunststoff, Basalt, Formfindung, Leichtbau 

Design

The curvature is one of the construction principles of nature. Think of the cranial bones of humans, the snail shells or even all kinds of bird eggs. With a minimum of material a maximum protective effect is produced or in the technical sense a high load quality or robustness is achieved.

In contrast to the shells formed in natural processes, the large-scale realization of curved surfaces in technology and especially in construction engineering is still an enormous technological challenge to this day. The b.ypar project marks an approach to the intelligent application of a high-performance material in the context of a curved surface and a comparatively simple craft manufacturing process.

A hypar or saddle surface describes in the geometrical sense an oppositely curved geometry. This has the feature that it is formed only from so-called straight generators. In this characteristic lies one of the keys to the design.

The overall shape of the b.ypar (basalt + hypar) results from the addition of 4 saddle surfaces. These touch each other along their straight edges. Through skillful intersection of the corner areas, the pointed corners (so-called "singularity areas") are eliminated and the stresses in the fiber layer are significantly reduced.

Material

High-performance materials fascinate and promise material-efficient and lightweight constructions due to their special properties. In particular, fiber-reinforced plastics are convincing due to the combination of load-bearing fibers such as carbon, glass or basalt and the forming resin matrix. Basalt fibers, for example, are made from a melt of the rock of the same name and have almost ten times the (tensile) strength compared to structural steel (S355). Their performance is comparable to that of carbon fibers, but much lower in terms of price, making the material economically very interesting.

Implementation

The primary tensile basalt fibers are first drawn through a special liquid plastic bath and then stretched between each two "combs", which are attached along the straight edges of a shaping auxiliary structure. As a result, they form a discontinuous, spatially curved lattice structure. The plastic resin hardens, which means it solidifies under the influence of air and thus permanently sets the fibers. After removing the auxiliary structure, the overall structure is sustainable. The weight of the prototype shown in the photo is approximately 1.4 kg.

The project could be realized through technical and material support of the SKZ from Halle / Saale.

Exhibition

The project was presented at the Designers' Open 2014 as part of the "Evolution of New Design" exhibition curated by the Association of German Industrial Designers (VDID).

Team

processed by:

Bruno Hoffmann

supervised by:

Prof. Dr.-Ing. Alexander Stahr