Abstract
A new technical solution for re-profiling round tubes into flat-oval ones with a ratio of 1 / 3,064 is presented, which increases their bending strength. The calculation of the optimal parameters of thin-walled sections of the flat-oval shape is given by an approximate method, the correctness of which is confirmed by testing from the standard profiles used. This calculation is repeated with respect to thin-walled sections of the oval shape. The whole diagram of changes in the design parameters of flat-oval and oval pipes is presented in the transformation of their cross-sections from vertical configurations to horizontal ones, including the transition through the outline of a circular shape. The comparative analysis of optimized cross sections of flat oval, oval and round tubes is carried out taking into account the elastic and elastic-plastic deformations of the structural material, where the length of the midline of the thin-walled section is taken as the dividing line between these deformations. The choice is substantiated in favour of flat-oval profile pipes due to their simpler shape including faces of constant curvature (flat and semi-circular), relatively low cost, lower height, greater compactness, higher resistance moment.
Highlights
Further optimization of flat-oval pipes is of practical interest in the case of beam systems, where flat-oval pipes can be no less rational and promising than in truss structures
The technical result of the proposed solution is an increase in the load-bearing capacity of the tubular profile due to the increase in strength characteristics in bending, reducing the complexity of its manufacturing and use in rod or beam structures, as well as reducing costs for them
This result is achieved by the fact that in the method of re-profiling a round pipe, including technological operations to change the cross-section, this section is given a flatoval shape with a ratio of overall dimensions 1 / 3,064 (Fig. 5, d) [7]
Summary
Further optimization of flat-oval pipes is of practical interest in the case of beam systems, where flat-oval pipes can be no less rational and promising than in truss structures. This forecast is justified by the fact that pipes (round and profile) are in high demand in industrial and civil construction, and in the construction of engineering structures, for example bridges [1]. The importance of manufacturing pipes made of highstrength steels is growing [2]
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