In-Plane Strain Solution of Stress and Defects of Tube Bending with Exponential Hardening Law

摘要

Approximate equations are derived based upon in-plane strain assumption in tube bending with exponential hardening law to provide quantitative methods for predicting stresses in different directions, Von Mises stress, neutral layer (NL) shift, wall thickness variation, and cross section flattening under rotary draw bending. It was revealed that calculated values of stresses are positively correlated with strength coefficient and negatively correlated with ratio of centerline radius (CLR) to diameter. The amount of the NL shift is directly proportional to the amount of wall thickness thinning at the extrados of tube and inversely proportional to the ratio of CLR to diameter. The strain weakening effect caused by deformation transfer leads to gradual reduction of wall thickness variation from the bent portion to the unbent portion. What is more, wall thickness variation may also have a significant influence on cross section flattening.View full textDownload full textKeywordsDefects, FE simulation, In-plane strain, Tube bending, Von Mises stressRelated var addthis_config = { ui_cobrand: "Taylor & Francis Online", services_compact: "citeulike,netvibes,twitter,technorati,delicious,linkedin,facebook,stumbleupon,digg,google,more", pubid: "ra-4dff56cd6bb1830b" }; Add to shortlist Link Permalink http://dx.doi.org/10.1080/15397734.2012.660617