Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: grubość ścianki rury

Sortuj według:

Ogranicz wyniki do:

Determination of the initial thickness of tubes subjected to bending. Part II. Discussion and analysis of obtained results

Śloderbach Z.

Engineering Transactions

2015

Vol. 63, iss. 4

497--507

In this second part of the paper, applying epressions derived in Part I, the exemplary calculations of the initial thickness of a metallic tube subject to bending at bending machines are presented. The expressions for calculating of the initial thickness were presented for a suitable measure of the big actual radius Ri in the bending zone for an exact (general) solution and for three formal simplifications of the 1st, 2nd, and 3rd order. In the calculations the external or internal diameter of the tube subjected to bending is applied as a parameter. In this paper, the author shows that the calculated initial thickness of the tube (for the same parameters of bending) depending on the external diameter is lower than that calculated depending on the internal diameter. For example, the expression for calculation of deformations included in the UE Directive [1], contains dependence on dext not on dint. The results of the calculations are presented in the graphs and tables enclosed.

Calculations of the strains and thicknesses of pipe elbows on the basis of expressions resulting from the EU directive for the case of large strains

Śloderbach Z.

Engineering Transactions

2015

Vol. 63, iss. 3

361--376

The relations to calculate the maximum value of relative strains, which occur in a process of bending of tubes on benders, in stretched layers of tubes, are presented in this work on the basis of the EU Directive concerning production of pressure equipment. It has been shown that for large deformations that occur during bending of the pipes on knees, logarithmic strain measures (real) and relative strain measures give different values of strain and equal wall thicknesses in the bending zone. Reverse expressions were also derived to calculate the required initial wall thickness of the tube to be bent, in order to obtain the desired wall thickness of a knee after bending.

Wpływ geometrii narzędzi na intensywność redukcji grubości ścianki rury w procesie ciągnienia na trzpieniu swobodnym.

Hatalak R.

Rudy i Metale Nieżelazne

1999

R. 44, nr 1

47-47