Thread pull force

If / is the number of engaged threads, the axial load from this thread pull force creates a bending stress 5 and a shear stress S at the root of the shaft thread ... 

The spinneret is a type of die principally used in fiber manufacture. It is usually a metal plate with many small holes (or oval, etc.) through which a melt is pulled and/or forced. They enable extrusion of filaments of one denier or less. Conventional spinneret orifices are circular and produce a fiber that is round in cross section. They can contain from about 50 to 110 very small holes. A special characteristic of their design is that the melt in a discharge section of a relatively small area is distributed to a large circle of spinnerets. Because of the smaller distance in the entry region of the distributor, dead spaces are avoided, and the greater distance between the exit orifices makes for easier threading.143... 

From the previous discussions, the residual oil was pulled and stripped from the rock surfaces. As shown in a 2D glass-etched model (see Figure 6.24), the residual oil after waterflood became isolated oil droplets. The polymer solution pulled the oil into oil columns. These oil columns became thinner and longer to form oil threads as they met the residual oil downstream. The oil upstream flowed along these oil threads to meet the residual oil downstream so that an oil bank was built. In the process of residual oil flowing along the oil threads, because of the cohesive force of the oil/water interfaces, it was also possible to form new oil droplets, which flowed downstream and coalesced with other oils. Now we are ready to discuss the role viscoelasticity plays. 

Pull-out strength n. Of threaded inserts in plastics moldings, the force required to pull the insert out of the molding. It may be expressed as the force per unit area of the engaged outside surface. 

Another DAG design based an a knee mechanism to generate force [14] is shown in Fig. 5. Two parallel threaded rods which connect the two larger levers shown in Figure 5 are synchronously rotated with a special gear-set wrench pulling the lower ends of the levers together. 

Bolted joints are subject to cychc changes in forces that want to pull the joints apart. That s why all threads in a stud and nut are required to assure full performance of the connection. Missing threads put excessive stress on the remaining threads which can lead to their pressure failure. 

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