Learning Objectives
The objective of this lesson is to learn about different types of failure mechanisms in beams by making and breaking sandwich panels from 6 different material combinations.
SELF-REFLECTION SHEET FOR SIPs
excellent example of a reflection sheet
TEST RESULTS from Wednesday 2/14:
Readings/Videos
I highly recommend that you also search on your own for other sources to learn more about the topics of shear stress, bending stress, and sandwich panels.
- What are SIPs? http://www.sips.org/about/what-are-sips
- Sandwich structured composites: https://en.wikipedia.org/wiki/Sandwich-structured_composite
Answer these questions (ie. hypothesize) before coming to class
- Which of the 6 panels will be the strongest?
- How do the panels with soft foam perform compared to the hard foam panels?
- How will the panels with sheet rock break (on top or on bottom)?
Activity
5 min: (Lecture) SIPs: What and Why
20min: Watch one real SIP panel bending test. Discuss failure mechanism.
30min: (Exercise) Fabricate 1 SIP specimen per team
Pick a number from 1-6 to assign panel assembly – shown below
Each team glues together the SIP for testing on Wednesday
Team |
Panel assemblies (Top/Middle/Bottom):
|
1 | P/S/P |
2 | P/H/P |
3 | HB/S/P |
4 | HB/H/HB |
5 | SR/S/P |
6 | P/H/SR |
P: plywood | |
HB: hardie board | |
SR: sheet rock | |
S: soft foam | |
H: hard foam |