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Post-critical deformation state of a multi-segment multi-member thin-shell structure subject to torsional deflection

Kopecki T., Dębski H.

Mechanics and Mechanical Engineering

2010

Vol. 14, nr 2

233-246

A three-segment ten-member thin-shell structure with flat walls is considered made of material with instantaneous characteristic approximated by means of an ideally elastic-plastic material model. The structure material (polycarbonate) demonstrates the temporary double refraction effect in polarized light. The system is subject to twisting resulting in state of local post-critical deformation of skin segments within the structure area that is interpreted, in first approximation, as a field of drawing forces. As a result of non-linear numerical analysis in the course of which conformance of equilibrium paths obtained numerically and by means of the experiment is assured, the stress field is determined taking into account the structure's flexural and membrane state.