摘要
基于有限元分析软件ANSYS/LS-DYNA,建立V150油套管热矫直的三维有限元模型,研究矫直后环向和轴向残余应力的分布规律,并利用X线衍射法测量了矫直管内表面环向残余应力。结果表明：环向和轴向残余应力呈螺旋状分布,螺旋接触带与管体轴向成58°的夹角,与矫直辊倾角互余,相邻的2个螺旋接触带之间的距离约为350 mm,基本等于矫直管的螺距（349 mm）;环向残余应力具有外拉内压规律,轴向残余应力外表面以拉应力为主,内表面拉压应力并存,压应力极大值出现在壁厚中部;矫直管内表面环向残余应力的实测值为189~489MPa,模拟数值为130~480 MPa,两者吻合良好,表明建立的矫直模型是可靠的。
A three-dimensional finite element model of hot straightening process for V150 casing was established by using the finite element analysis software ANSYS/LS-DYNA. According to this model, the distribution law of circumferential and longitudinal residual stresses after straightening was analyzed. In addition, circumferential residual stress of inner surface of the casing was measured by XRD to compare with the results of finite element simulation. The results show that circumferential and longitudinal residual stresses reveal the phenomenon of spiral contact zone, the spiral contact zone makes up an angle of 58° along longitudinal direction, which is the complementary angle of roller＇ tilt angle. The distance between the two adjacent contact zone is about 350 mm, which almost equals to the pitch of the straightening roller. Circumferential residual stress shows that the outer surface stress is tensile and the inner surface stress is compressive. Longitudinal residual stress shows that the outer surface stress is mainly tensile. Tensile and compressive stresses co-exist on the inner surface, and the peak of compressive stress appears in the middle of the thickness. The experimental results show that circumferential residual stress of inner surface of the easing is between -189 and -489 MPa and that of simulation results is between -130 and -480 MPa. The two results are in good agreement, which proves that the straightening model is reliable.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第4期1373-1379,共7页
Journal of Central South University:Science and Technology
基金
湖南省重大科技专项(2008FJ1003)
关键词
V150油套管
热矫直
残余应力
螺旋接触带
V 150 casing
hot straightening
residual stresses
spiral contact zone
