SIPs

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

  1. Which of the 6 panels will be the strongest?
  2. How do the panels with soft foam perform compared to the hard foam panels?
  3. 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