FIELD: machine building.
SUBSTANCE: tubular material has external border and internal border in its cross section. The external border of tubular material in cross section has a shape of ellipse (conic section). The internal border of cross section corresponds to circumference. Also, centre of circumference is in the centre of ellipse of the external border of cross section. Ratio of bigger axis of ellipse to smaller axis of ellipse at the external border (ellipse) is from 1.5 to 5.
EFFECT: increased service life of tubular material.
1 dwg
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