COF Measurement of Tubes by Hydraulic Bulging with Radial Crushing

Lian Fa Yang; Cong Qiang Wu; Feng Jun Chen

doi:10.4028/www.scientific.net/AMR.189-193.2597

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 189-193COF Measurement of Tubes by Hydraulic Bulging with...

COF Measurement of Tubes by Hydraulic Bulging with Radial Crushing

Abstract:

A new method of determining the coefficient of friction (COF) in expansion zone of tube hydroforming (THF) is proposed. The measuring method features that a round tube is hydro-formed into a square one by a radial compression accompanying a constant internal hydraulic pressure p, and the difference ΔL of the two diagonal lengths of the square section of deformed tube is taken as measuring index for COF. The relationships between the ΔL and the p, COF, relative displacement S/S0 of moving punches are established by the finite element (FE) simulation of the forming process. The COF can be determined by matching the indexes ΔL from experiments and simulation. The FE simulation results show that the measuring index ΔL is in exponent proportion to COF and the internal pressure p, it is extremely sensitive to the friction force or COF and conveniently measured and especially under a higher internal pressure.

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Periodical:

Advanced Materials Research (Volumes 189-193)

Pages:

2597-2600

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.189-193.2597

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Online since:

February 2011

Authors:

Lian Fa Yang, Cong Qiang Wu, Feng Jun Chen

Keywords:

COF, Finite Element (FE) Simulation, Hydraulic Bulging, Measurement, Radial Crushing

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