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The two equations that give a maximum axial force are F=σ/sin(α)^2 and F=σ/sin(2α), where α is the angle from the horizontal to the joint. Both should be evaluated for a given problem, and the smaller F of the two is the magnitude of the maximum allowable axial force. The first equation accounts for failure in tension.
The curve representing a clamped parts-to-bolt stiffness ratio of 0.01 shows that when the relative stiffness of the clamped parts is very low, almost all of the load is transferred to the bolt, down to the point where a compressive load equals the preload, and separation at the bolt head occurs, reducing the force in the bolt to zero.
Multi-jackbolt tensioners (MJTs), registered under the trademark Superbolt or Supernut, are designed to decrease the torque required to tighten large bolted joints. One of the major problems associated with traditional bolt tightening methods is as the diameter of the bolt increases, the amount of torque required to tighten it increases in the third power of the diameter. [1]
The force and torque vectors that arise in applying Newton's laws to a rigid body can be assembled into a screw called a wrench. A force has a point of application and a line of action, therefore it defines the Plücker coordinates of a line in space and has zero pitch. A torque, on the other hand, is a pure moment that is not bound to a line ...
Lead is the axial advance of a helix or screw during one complete turn (360°) [1] The lead for a screw thread is the axial travel for a single revolution. [ 2 ] Pitch is defined as the axial distance between adjacent threads on a helix or screw.
The mechanical advantage MA of a screw is defined as the ratio of axial output force F out applied by the shaft on a load to the rotational force F in applied to the rim of the shaft to turn it. For a screw with no friction (also called an ideal screw ), from conservation of energy the work done on the screw by the input force turning it is ...
This is a combination of the nut applying an axial clamping force and also the shank of the bolt acting as a dowel, pinning the joint against sideways shear forces. For this reason, many bolts have a plain unthreaded shank (called the grip length), as this makes for a better, stronger dowel.
Bolts are correctly torqued to maintain the friction. The shear force only becomes relevant when the bolts are not torqued. A bolt with property class 12.9 has a tensile strength of 1200 MPa (1 MPa = 1 N/mm 2 ) or 1.2 kN/mm 2 and the yield strength is 0.90 times tensile strength, 1080 MPa in this case.