Bolted joints Flashcards
1
Q
What are some advantages of bolted joints?
A
- Dissimilar materials can easily be joined
- Requires simple surface preparation
- Inexpensive fasteners
- Gives control of degrees of freedom
- Better for disassembly
2
Q
what are some disadvantages of bolted joints?
A
- high weight
- Large stress concentrations are introduces
- Joint strength cannot exceed the local substrate strength
- worse in fatigue
- Not fluid tight
- Accidental disassembly can happen (vibrations)
3
Q
What is bearing failure in bolted joints, and when does it occur?
A
- Local crushing at the bolt-hole contact interface. Damaged material attempts to expand in thickness direction.
- Occurs when d/w ratio is small
- Desirable since it develops slowly, giving timely warning before ultimate failure
4
Q
What is net area tension faliure in boltet joints?
A
Failure along the hole
Occurs more often when d/w ratio is large
5
Q
What are the different failure modes that can happen in bolted joints?
A
- Bearing failure
- Net section failure
- Wedge type splitting
- Shear-out failure
- Cleavage
- Pull through
6
Q
what is cleavage failure in a bolted joint?
A
Longitudinal splitting in addition to net-tension, thejoint end becomes split. Can be avoided by optimally chosen layups
