![]() ![]() ![]() The length of the coupler nut (l) is obtained by considering the shearing of the threads at their roots in the coupler nut. The nominal diameter of the threads (or diameter of the rod) may be found from Table 11.1, corresponding to the core diameter, assuming coarse threads. Σt = Permissible tensile stress for the material of the rod.įrom the above expression, the core diameter of the threads may be obtained. Where dc = Core diameter of the threads of the rod, and Tearing resistance of the threads of the rodĮquating the design load (Pd) to the tearing resistance of the threads, we have The diameter of the rods (d) may be obtained by considering the tearing of the threads of the rods at their roots. The following procedure may be adopted in designing a turn-buckle : 1. Therefore for designing a threaded section, we shall take the design load as 1.3 times the normal load, i.e. Design load, Pd = 1.3 P Giving a margin for higher coefficient of friction, the maximum principal stress may be taken as 1.3 times the normal stress. Tan φ = Coefficient of friction between the threaded rod and the coupler nut, andĭp = Pitch diameter or mean diameter of the threaded rod. In order to drive the rods, the torque required is given by Where dc = Core diameter of the threaded rod. Due to this load, the threaded rod will be subjected to tensile stress whose magnitude is given by Consider a turnbuckle, subjected to an axial load P, as shown in Fig.
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