inner joint meaning in English

内接口
内接头

4 . because there are sub - elements in a member with the introduction of inner joints , when tile spatial stifmess matrix of main joints of a member is made , there are some cases of solving the double nonlinear equations , negative stifmesses , and singular stiffness matrices in process of iterating
4 、由于引入了内结点，构件存在子单元，在形成主节点的构件空间单元刚度矩阵时，存在双重非线性方程求解，迭代过程中负刚度和刚度矩阵奇异问题。
As the analysis shows that stress of the outside joint bar of rail is higher than that of the inner joint bar when a wheel rolls over the rail joint . furthermore the change of bolt tension has great effect to the stress distribution and stress level of all parts of rail joint
分析表明：接头受力时，钢轨外侧夹板的应力水平比内侧夹板的应力水平高；在受力条件相同的情况下，螺栓扭矩的变化对接头各部件的应力分布及应力水平有较大影响。