CAJ | 학술논문

针对金属管材端部内卷成形加工工艺的力学特性进行了分析,基于Prandtl-Reuss流动法则,结合更新拉格朗日算法(Updated Lagrangian Formulation,ULF)建立了增量型弹塑性大变形有限元分析模型.以γ_(min)法则处理边界及变形时弹塑性状态的转换,并用修正的库仑摩擦法则的增量型式来处理边界接触面上具有滑动与黏滞状态的摩擦现象,将其导入整体刚性矩阵中,推导出刚性方程.研究表明,成形过程中,管材端部的变形及成形负荷受引导筒及模具角度的影响.对比表明,有限元模拟与实验结果具有良好的一致性.
침대금속관재단부내권성형가공공예적역학특성진행료분석,기우Prandtl-Reuss류동법칙,결합경신랍격랑일산법(Updated Lagrangian Formulation,ULF)건립료증량형탄소성대변형유한원분석모형.이γ_(min)법칙처리변계급변형시탄소성상태적전환,병용수정적고륜마찰법칙적증량형식래처리변계접촉면상구유활동여점체상태적마찰현상,장기도입정체강성구진중,추도출강성방정.연구표명,성형과정중,관재단부적변형급성형부하수인도통급모구각도적영향.대비표명,유한원모의여실험결과구유량호적일치성.
The mechanical properties of inward coiling for the metal tube were analyzed. Under the assumption of Prandtl-Reuss flow rule, the incremental elasto-plastic large deformation finite element model was established based on the Updated Lagrangian Formulation (ULF). The elasto-plastic conversions of boundary and deformation were pro-cessed with γ_min rule. The friction phenomenon that had slippage and viscosity at the boundary interface was handled with increment of revision Coulomb rule. The increment was led into the whole stiffness matrix, and derived out the stiffness equation. Finite element simulation and experimental result have a good consistency.