TY - JOUR
T1 - Modelling of wrinkling in NC bending of thin-walled tubes with large diameters under multi-die constraints using hybrid method
AU - Liu, Nan
AU - Yang, He
AU - Li, Heng
AU - Zhan, M.
AU - Tao, Zhijun
AU - Hu, Xiao
N1 - Publisher Copyright:
© 2014 The Authors. Published by Elsevier Ltd.
PY - 2014
Y1 - 2014
N2 - Numerical control thin-walled tube bending is an advanced technology for manufacturing precision bent tube parts in aerospace, aviation and automobiles, etc. With an increase in the diameters of thin-walled Al-alloy tubes and a decrease in bending radii, accurate prediction of wrinkling instability under multi-die constraints is still one challenge and a focused issue, especially for the thin-walled Al-alloy tubes in aviation. Solely using pure analytical solution method, energy-based analytical solution method, pure explicit algorithm or implicit algorithm cannot accurately predict the wrinkling instability. In this study, the analytical bifurcation solution, analytical-numerical energy-based model and eigenvalue buckling analysis are conducted to generate different kinds of buckling modes, respectively, and a series of imperfections are defined in the shapes of these buckling modes. Second, by assigning the geometrical imperfection into the perfect mesh of the tube, a series of hybrid explicit FE models for numerical control rotary-draw-bending is established. The numerical perturbation analyses are carried out with different bifurcation modes-shapes. Thus, based on the minimum energy principle, the shape of imperfection (bifurcation path) and the magnitude of the imperfection (scaling factors) are chosen, which is corresponded to the lowest level of energy consumption. Third, a set of bending experiments is conducted on Al-alloy tube to verify the predictive capability. The predicted results are in good agreement with the experimental results.
AB - Numerical control thin-walled tube bending is an advanced technology for manufacturing precision bent tube parts in aerospace, aviation and automobiles, etc. With an increase in the diameters of thin-walled Al-alloy tubes and a decrease in bending radii, accurate prediction of wrinkling instability under multi-die constraints is still one challenge and a focused issue, especially for the thin-walled Al-alloy tubes in aviation. Solely using pure analytical solution method, energy-based analytical solution method, pure explicit algorithm or implicit algorithm cannot accurately predict the wrinkling instability. In this study, the analytical bifurcation solution, analytical-numerical energy-based model and eigenvalue buckling analysis are conducted to generate different kinds of buckling modes, respectively, and a series of imperfections are defined in the shapes of these buckling modes. Second, by assigning the geometrical imperfection into the perfect mesh of the tube, a series of hybrid explicit FE models for numerical control rotary-draw-bending is established. The numerical perturbation analyses are carried out with different bifurcation modes-shapes. Thus, based on the minimum energy principle, the shape of imperfection (bifurcation path) and the magnitude of the imperfection (scaling factors) are chosen, which is corresponded to the lowest level of energy consumption. Third, a set of bending experiments is conducted on Al-alloy tube to verify the predictive capability. The predicted results are in good agreement with the experimental results.
KW - Explicit
KW - Hybrid method
KW - Imperfection
KW - Implicit
KW - Instability
KW - Thin-walled tube bending
UR - http://www.scopus.com/inward/record.url?scp=84949132498&partnerID=8YFLogxK
U2 - 10.1016/j.proeng.2014.10.304
DO - 10.1016/j.proeng.2014.10.304
M3 - 会议文章
AN - SCOPUS:84949132498
SN - 1877-7058
VL - 81
SP - 2171
EP - 2176
JO - Procedia Engineering
JF - Procedia Engineering
T2 - 11th International Conference on Technology of Plasticity, ICTP 2014
Y2 - 19 October 2014 through 24 October 2014
ER -