The dimensional reduction or shortening of the face-to-face parallel length of the joint measured along the longitudinal axis.
Axial Elongation of a rubber expansion joint
The dimensional increase or lengthening of the face-to-face parallel length of the joint measured along the longitudinal axis.
Lateral Deflection of a rubber expansion joint
Lateral deflection is movement perpendicular to the axial plane of the expansion joint. It is a shear motion on the bellows.
Vibration of a rubber expansion joint
The movement of the joint due to vibrations which are effectively intercepted and insulated against transmission to the remainder of the system.
Angular Movement of a rubber expansion joint
The displacement of the longitudinal axis of the joint from its initial straight line position (a combination of axial elongation and axial compression).
Torsional Movement of a rubber expansion joint
The twisting of one end of the expansion joint with respect to the other end about its longitudinal axis