| Summary: | 碩士 === 國立成功大學 === 機械工程學系碩博士班 === 93 === The purpose of this study is to propose two new locking couplers for threaded bars and to design the proper dimensions for the couplers to meet the requirements for the necessary tests of SA grade of the locking coupler for threaded bars. First of all, relative references about splicing manners are collected to evaluate the advantages of different connectors. Next, according to the function requirement for threaded-bar couplers, some new feasible threaded-bar couplers are synthesized through a systematic design procedure. Two of them are then evaluated for further dimensional design. A pair of lock-nuts with an eccentric taper end is applied in the first type of designs for connecting two threaded bars. In the second one, two threaded bars are locked by means of the deformation of coupler with grooves for preventing loosening. In order to analyzing the deformation behavior of the threaded-bar coupler, the analysis of the locking torque, thread stress between bolt and nut, and the strain-stress analysis using the finite element method(ANSYS) are applied to design the proper dimensions of the threaded-bar coupler for the sake of preventing plastic deformation. Finally, the dimensions of two new locking couplers for threaded bars are fully completed.
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