TY - JOUR
T1 - Accurate prediction of the profile of thick-walled titanium alloy tube in rotary-draw bending considering strength-differential effect
AU - Liu, Jing
AU - Yang, He
AU - Zhan, Mei
AU - Jiang, Zhiqiang
PY - 2012/7
Y1 - 2012/7
N2 - In rotary-draw bending of thick-walled titanium alloy tube, the tube material exhibits a strength-differential effect (S-D effect) due to the compressive stress state at the inside region but the tensile stress state at the outside region. Neglecting the S-D effect will lead to a significant decrease in the prediction accuracy of the profile of the bent tube, such as wall thickening/thinning degree, cross-section distortion degree and springback angle. Therefore, a new FE model considering the S-D effect is established in this work. In modeling, the material properties obtained from uniaxial tension and compression tests are applied to the outside region and inside region, respectively. Combined with the experiments, the present model is compared with the previous one with only applying tensile material properties to evaluate their prediction accuracies on the tube profile. The results show that, compared with the previous FE model, the present one is more reliable to accurately predict the wall thickening degree, cross-section distortion degree and springback angle for bending specifications 14 × 1.35 × 42 and 20 × 1.9 × 60 (tube outer diameter × wall thickness × bending radius, mm) with precisions improved even by 21%, 25% and 17%, respectively.
AB - In rotary-draw bending of thick-walled titanium alloy tube, the tube material exhibits a strength-differential effect (S-D effect) due to the compressive stress state at the inside region but the tensile stress state at the outside region. Neglecting the S-D effect will lead to a significant decrease in the prediction accuracy of the profile of the bent tube, such as wall thickening/thinning degree, cross-section distortion degree and springback angle. Therefore, a new FE model considering the S-D effect is established in this work. In modeling, the material properties obtained from uniaxial tension and compression tests are applied to the outside region and inside region, respectively. Combined with the experiments, the present model is compared with the previous one with only applying tensile material properties to evaluate their prediction accuracies on the tube profile. The results show that, compared with the previous FE model, the present one is more reliable to accurately predict the wall thickening degree, cross-section distortion degree and springback angle for bending specifications 14 × 1.35 × 42 and 20 × 1.9 × 60 (tube outer diameter × wall thickness × bending radius, mm) with precisions improved even by 21%, 25% and 17%, respectively.
KW - Profile
KW - Rotary-draw bending
KW - Strength-differential effect
KW - Thick-walled titanium alloy tube
UR - http://www.scopus.com/inward/record.url?scp=84860539639&partnerID=8YFLogxK
U2 - 10.1016/j.commatsci.2012.02.029
DO - 10.1016/j.commatsci.2012.02.029
M3 - 文章
AN - SCOPUS:84860539639
SN - 0927-0256
VL - 60
SP - 113
EP - 122
JO - Computational Materials Science
JF - Computational Materials Science
ER -