AdvancedBoltTorqueAuditYields Bolt Tension Data
Gin and analysis of the torque-angle signature to de-termine the elastic tightening angle of turn. The angulardisplacement (turn) of the fastener stretches the boltand compresses the parts being clamped. The elasticclamping region of the torque-angle signature is theregion where clamping force is directly proportional tothe angle of turn from the elastic origin. The elastic origin is located by projection of thestraight-line portion of the signature curve backwardsto zero torque, or the prevailing torque level in the caseof thread locking interference type of principal can be observed when viewing a clampload-angle curve (see Figure 1).
sured torque and tension, shown in Figure 3, it is ap-parent that both are in direct proportion to each other. Step 4: Determine the Elastic Clamping Angle,
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