Based on the theory of large spatial deflection of elastic rod, this paper sets up a differential equilibrium equation governing tubulars constrained in inclined wellbores in convected coordinate system. 利用弹性杆的大变形理论,在拖带坐标系下建立了斜直井孔约束下钻柱的平衡微分方程。
Finite element method and the finite difference approach are respectively applied to implement the numerical calculation of elastic equilibrium equation and Hamilton-Jacobi equation. The validity of the presented method is demonstrated by one typical example. 用有限元法和有限差分法相结合的方法分别实现弹性平衡方程和Hamilton-Jacobi方程的数值计算,并通过一个典型算例证明所研究方法的有效性。
By using lubrication equation, elastic equilibrium equation and narrow gap flow theory, the pressure distribution, thickness of liquid film and friction force on the inner surface of the reciprocating rectangular sealing ring, which play an important role on sealing performance, are studied. 针对往复矩形密封,应用润滑方程、弹性平衡方程和缝隙流理论分析了对密封性能起关键作用的密封圈内表面轴向压力分布、液膜厚度、摩擦力;
Based on elastic theory, in this paper cast-in-situ RC hollow flat slab is converted to orthotropic plates by the pseudo-plates theory and the equilibrium equation is built. 本文在经典弹性薄板理论的基础上,通过拟板法将双向空心板等效为正交各向异性的实心板,建立无梁空心楼板的平衡方程。
In light of the elastic thin plate theory, the author induced equilibrium differential equation of bi-direction cellular slab, which was proved correct through analysis and comparison to result of ANSYS to with theoretical calculation. 本文根据弹性薄板理论,导出了双向空腹板的平衡微分方程,并通过理论计算和通用有限元程序ANSYS结果对比,验证了其正确性;
According to the stress continuous conditions of the elastic/ plastic boundaries, the radical stress equilibrium equation is established at the elastic/ plastic boundaries. Solving the equation, the boundary radius of elastic/ plastic zones ( i.e. sanding radius) can be calculated. 根据弹、塑性边界的应力连续条件,建立弹、塑性边界上的径向应力平衡方程,求解可计算弹、塑性区边界半径即出砂半径。
We also obtained the elastic ultimate load of the expansion anchors embedded in concrete under tensile axial load and by using Modified Mohr-Coulomb material failure criterion and ultimate equilibrium equation. 通过弹性分析结合修正的莫尔库仑材料破坏准则,确定了埋置于混凝土中的膨胀摩擦型锚栓在轴向拉力作用下的弹性极限荷载,利用极限平衡得出拉伸极限荷载的计算公式。