problem of two bodies meaning in English

二体问题

If we can accurately ensure the rigidity coefficient , the result of mathematic analysis method can approach the fact accurately by applying contact mechanics theory , we can deal with the lining and lining as contact problem of two bodies . using pretension bolted solid finite element simulate bolt at linings . thus not only considers perpendicular rigidity but also considers the tangent contact rigidity
( 4 )通过运用接触力学的理论，将管片与管片的接头抽象成为两个体与体的接触问题，在管片处的螺栓采用有限元中的实体螺栓预紧单元进行模拟，这样不但考虑了管片与管片处的法向刚度接触而且考虑了管片与管片间的切向接触刚度。