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Shvoong Home>Science>Determination of maximum forming pressure and bulge coefficient of thin-walled tube in free hydro-bu Summary

Determination of maximum forming pressure and bulge coefficient of thin-walled tube in free hydro-bu

Article Summary   by:TsingHua     Original Author: Journal of Plasticity Engineering
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As an effective technique to manufacture thin-walled hollow structure parts,tube hydro-bulging is enjoying increasingly widespread applications in industry.Based on material anisotropy theory and the assumption that profile of thin walled tube in free hydro-bulging process of an open die is a cosine curve and any point on the profile moves tangent to the profile,mathematical models are deduced for determining the maximum pressure p_b at bursting and the maximum bulge coefficient K_(max).Free hydro-bulging experiments on tubes of stainless steel and low carbon steel are conducted to validate the models and the experimental data indicate that the theoretical models are reliable and accurate.The behavior of the forming internal pressure,the distribution of wall thickness and profile of the deformed tube are analyzed and discussed.The results also display that the maximum pressure p_b decreases with the free bulging length l_0,while the maximum bulge coefficient K_(max) is hardly dependent of l_0-value.
Published: February 28, 2006   
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