摘要
建立了螺旋形螺纹三维有限元模型,通过螺纹表面应力分布等数值计算验证模型方案的有效性,并对扭转载荷下螺纹结构的力学特性开展数值研究。结果表明:螺纹结构在加、卸载阶段均经历了黏着、部分滑移和宏观滑移3种状态;在拧紧过程的宏观滑移阶段由于轴向力增大,扭矩呈上升趋势,在拧松过程中由于轴向力减小,扭矩呈下降趋势。在螺纹结构有限元计算结果的基础上,针对扭转载荷作用下带升角的三维螺纹结构,通过增添宏观滑移时的残余刚度和扭矩整体修正量,建立了修正的IWAN模型。计算结果表明:修正的IWAN模型能较准确地重现有限元模拟结果中扭矩与转角的关系,且3个Jenkins单元模型组成的修正IWAN模型即可足够精确地还原有限元模拟得到的耗散能。
A three-dimensional finite element model of spiral thread is established in the paper,and the effectiveness of the model scheme is verified by the numerical calculations of "stress distribution on the surface of thread",the mechanical properties of threaded structure under torsional load are numerically studied.The results show that:The thread structure experiences three states:adhesion,partial slip and macro slip in the loading and unloading stages;In the macro sliding stage of the tightening process,the torque increases due to the increase of axial force,and decreases due to the decrease of axial force in the loosening process.Based on the finite element calculation results of threaded structure,for the threedimensional threaded structure with lifting angle under torsional load,the modified IWAN model is established by adding the overall correction of residual stiffness and torque during macro slip.The calculation results show that the modified IWAN model can accurately reproduce the relationship between torque and rotation angle in the finite element simulation results,The modified IWAN model composed of three Jenkins element models can accurately restore the dissipated energy obtained by finite element simulation.
作者
李九一
周丰峻
刘建华
孙云厚
朱精忠
邱明坤
LI Jiu-yi;ZHOU Feng-jun;LIU Jian-hua;SUN Yun-hou;ZHU Jing-zhong;QIU Ming-kun(National Defense Engineering Research Institute,Academy of Military Science of PLA,Beijing 100850,China;School of Materials Science and Engineering,Southwest Jiao Tong University,Chengdu 610031,China;Internal Control Audit Center of PLA General Hospital,Beijing 100850,China)
出处
《吉林大学学报（工学版）》
EI
CAS
CSCD
北大核心
2023年第5期1305-1314,共10页
Journal of Jilin University:Engineering and Technology Edition
基金
国家自然科学基金项目(52075460,51774295)。
关键词
工程力学
螺纹结构
有限元建模
扭转载荷
IWAN模型
engineering mechanics
thread structure
finite element modeling
torsional load
IWAN model
