Different from traditional electric and pneumatic screwdriver tools, this screwdriver system can adjust the screw with no axialpressure when driving screws.
区别于现有的电动、气动螺丝刀工具，该螺丝刀系统在驱动螺丝时，能对螺钉头实现无轴向压力的调节。
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A shallow shell model is developed for the elastic buckling of a single wall carbon nanotube under a uniform external axialpressure by using the nonlocal elastic theory.
With the theory of finite element method, the simulation calculation is conducted for the axialpressure distribution law, the leakage rate and the pressure variation of the seal rings.