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