PROFILING OF THIN SHEET WORKPIECES

The helical thin-sheet shape, made in the form of metal hose, sharply changes rigidity at stretching strain: from С = 4,1-4,3 N/mm up to the C = 2,7∙103 N. The destruction happens at a tension in a metal hose equal σ – 22=30 MPa that is much less than yield point. The metal hose breaks down when only elastic deformations take place in its material.