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Compressive force that the bolt exerts on the joint materials, also called clampload.
Tension force that is generated in the bolt.
Applied force in the same direction as the axis of the bolts.
Applied force to the joint that is perpendicular to the bolts.
Resistant force to materials moving against each other.
Resistant force to materials moving against each other.
The amount of torque required to run down a screw or bolt, typically associated with a lock-nut or thread forming screw.
The amount of torque remaining in the joint after tightening.
The amount of torque required to turn the fastener after it has been tightened, usually in the tightening direction.
A loss of clampload in a joint after tightening.
A cause of relaxation attributed to high surface pressure in hard surfaces, most apparent in hard joint with multiple hard layers. Relaxation associated with embedment typically stabilizes quickly (less than 0.2 seconds).
A cause of relaxation attributed to soft materials under high pressure that slowly flow material away from the joint. Can take longer periods of time than embedment losses.
Force per unit area e.g. Newtons per square millimeter or pounds per square inch.
Change in length compared to original length.
The region of the angle-torque curve in which the material returns to the undeformed state when applied forces are removed.
The area in which the material deforms permanently.
The point separating the elastic from the plastic area.
The point at which the components of a bolted joint are contacted together and torque starts to build.
The plates and material between the nut and bolt bearing surfaces have a high stiffness. Usually defined as hard if the bolt is tightened to its full torque and it rotates through an angle of 30 degrees or less after it has been tightened to snug.
The plates and material between the nut and bolt bearing surfaces have a low stiffness. This usually has to be tightened by two or more complete turns, after it has been torqued to snug.