ESDU TM 175:2012
$22.75
Self-Loosening of Bolted Joints
| Published By | Publication Date | Number of Pages |
| ESDU | 2012-11 | 47 |
ESDU TM 175 considers the mechanisms involved in the phenomenon
of bolt self-loosening which may take place during repeated
applications of shear loads on the bolted joint, including the
relative motion in bolt threads, slackening and unscrewing of the
bolt. The torque/tension relationship in prevailing torque nuts is
also examined. Examples of bolt self-loosening data are presented
describing the effects of pre-loading, bolt clamped length and
shear displacement during the loss of bolt clamping force. Good
joint design which prevents relative movement of the members is
always the best method to prevent bolt self-loosening. However, if
vibration or the repetitive application of shear loading is
unavoidable and the required preload cannot be maintained, this
Item gives guidance to minimize the loss of clamping force and
reduce any damage due to bolt self-loosening.
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