Bolt Failure - which is the biggie?
Bolt Failure - which is the biggie?
(OP)
Hi
Generally bolted fasteners can fail due to mechanical failure (shear/strip) or loosening ...........
Does anyone know of some credible research/report into
1. The relative importance of these and
2. The cost to industry (downtime $)
Cheers
Simon
Generally bolted fasteners can fail due to mechanical failure (shear/strip) or loosening ...........
Does anyone know of some credible research/report into
1. The relative importance of these and
2. The cost to industry (downtime $)
Cheers
Simon





RE: Bolt Failure - which is the biggie?
Have a look at this site:-http://www.boltscience.com/index.htm?
regards
desertfox
RE: Bolt Failure - which is the biggie?
I have looked through this site - great resource - but was thinking there is probably some detailed study out there somewhere? -- NASA ........... PHD thesis .... Shared Commercial Research .......Conference paper ???
Seems fastener failure is a big problem - I have been looking into aspects of vibration ......... and solutions- and wondering how significant it is as a problem ......????????
Cheers
Simon
Cheers Simon
www.pukugolf.com
RE: Bolt Failure - which is the biggie?
You need to take a more holistic view. Fasteners don't fail. Joints fail.
The solution to vibration problems is knowledge and proper design.
RE: Bolt Failure - which is the biggie?
"Guide to Design Criteria for Bolted and Riveted Joints"
http://www.boltcouncil.org/guide1.htm
and
"NASA Fastener Design Manual"
http://
www.SlideRuleEra.net
RE: Bolt Failure - which is the biggie?
Is the bolt a static structural joint, or is it subjected to rapid cyclic stress and therefore metal fatigue ?
It is why there are so many different types and grades of bolts made. The aerospace people go into all this in very great depth.
The actual bolt is never really the problem. First comes the correct design of the joint itself, then selecting a suitable type and grade of bolt, then correct installation.
I doubt very much if you can isolate all bolt failures into a single category and compute cost to industry.
For instance the aircraft industry are absolutely fanatical about threaded fasteners and therefore have very few failures.
Home handymen have bolts bend, strip, or come loose all the time, but that is not the fault of the bolt, so you cannot say the bolt itself actually failed.
RE: Bolt Failure - which is the biggie?
I am aware of such a failure which caused a fatality.