| Summary |
In the manufacture field of plastics, high strengthening by drawing of films is general. It is easy to draw uniaxial direction, however, there have been few cases that performed biaxial elongation, especially in three-dimensional (3D) shape. This paper presents an experiment of fabrication 3D curved surface of ETFE membrane structure by drawing the cutting pattern strips with several prescribed stress ratios between the warp or MD direction and the weft or TD direction. The results of the experiments showed that the 3D smooth curve surfaces could be established with the stress ratios as same as the prescribed stresses in form finding and cutting pattern analysis. In addition, the reduction of the rigidity of structures after the prestress construction period was seen at the pressure of around 1.3kPa.
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