D10: Section - Sandwich Flashcards
1
Q
What is the appeal of sandwich structures?
A
Very efficient way of increasing stiffness, very low weight increase
2
Q
What are the 2 ways we can optimise the size of the core?
A
- For stiffness or for strength
3
Q
What are the preliminary assumptions regarding the skins & core’s structural roles?
A
- Skins carry all end loading due to axial loads and bending moments
- Cores carry all shear loading
4
Q
What property dominates bending strength of a s/w panel?
A
- Flexural strength of the skins
5
Q
What property dominates the local compression strength of a s/w panel?
A
- Through-thickness compression strength of the core
6
Q
What are the 4 stability failure modes of s/w panels? Which is the most concerning to designers and why?
A
- Euler buckling
- Shear crimping
- Face wrinkling
- Intracell buckling
- Skin wrinkling because the aim is to have skins as thin as possible
7
Q
What leads to shear crimping?
A
Low core shear modulus
