Science's web page has the tutorial shown below (Bolt Science is
not affiliated with FAST-DAQ or SureBolt).
All credit for
this information should go to Bolt Science. Bolt Science is the best resource on
the web for bolted joint education.
After all the mechanical engineering classes on stress analysis calculations,
why do some bolted joints fail? Here is
the main link page to Bolt Science's bolted joint tutorial. Notice the problems
caused by variations in bolt tension. SureBolt helps you avoid such variations in tension.
See animation. What are the sources
of torque wrench tension errors?
For more information, see the main
A Tutorial on the Basics of Bolted Joints
The complexity of the simple nut and bolt is frequently underestimated. A fully
tightened bolt does not perform like a loose bolt. A fully tightened bolted
joint can sustain millions of load cycles without problems, a joint consisting
of untightened bolts will frequently fail within a few cycles. The reason for
this is the way a bolted joint carries an external load - a fully tightened bolt
sustains only a small proportion of any externally applied load. This tutorial
seeks to explain why this occurs.
Presented in this tutorial are details about the basics of bolted joint
technology and in particular on the mechanics of the load transfer mechanism
involved in such joints. There are a number of pages to this tutorial covering
the topic from the basics. Additional pages are being added as and when time
permits. Bolt Science is committed to providing assistance on bolted joint
technologies to individuals, companies and other organizations. If you have a
question on any of the topics - why not email us and we will try to answer your
is preload important - why bolt's clamp force vital?
a bolted joint sustains an applied force
is a Joint Diagram?
Diagram with an external force applied
effect of a high external force on a joint
effect of a compressive external force on a joint
Effect of Joint Deformation loss due to Embedding
Preload Variation due to the Tightening Method
All Trademarks are acknowledged.
Bolt Science - Specialists in Bolted Joint Technology
Copyright © 1999 Bolt Science. All rights reserved.
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