| Summary |
ETFE film is a material which has a large elongation under tensile stress and it is possible to make higher strength by stretching a film in construction. In previous work, we have proposed a stretching method on film and verified a effectiveness of tension type. In general, we introduce the initial stress by stretching boundaries in construction but have a problem which occur a crack by stress concentration in where a shape of boundary compared to the surroundings is rapidly changed.
In this paper, we investigated a shape and a size of notch in order to avoid a stress concentration on film. First, we examined a uniaxial tensile test of ETFE film to study the relation between stress concentration and crack propagation by changing a shape of crack. And then, we carried out FEM analysis on a experimental model simulated a uniaxial tensile test. Finally, we investigated a stress concentration on crack and notch tip and a stress contribution when crack tip yielding occurs. |