ME 412 Class No. 17943 S. F. Felszeghy		Winter 2009
	STRENGTH OF MATERIALS LABORATORY II

Week	Date	Experiment
1	Jan. 9	Photoelasticity
2	Jan. 16	Photoelasticity
3	Jan. 23	Photoelasticity
4	Jan. 30	Photoelasticity
5	Feb. 6	Compressed Split-Ring
6	Feb. 13	Shear Center of Channel Beam
7	Feb. 20	Buckling of Columns
8	Feb. 27	Adhesive-Bonded Joints
9	Mar. 6	Fatigue
10	Mar. 13	Fatigue

References

CSULA Library Books
Budynas
Juvinall
Shigley
Timoshenko

Photoelastic Equipment & Materials, Measurements Group.

Photoelasticity, School of Mechanical & Production Engineering, Nanyang Technological University, Singapore.

Research in Automated Photoelasticity, Mechanical and Industrial Engineering, University of Toronto.

Role of Photoelasticity in Periodontal Therapy, UCLA.

Photoelasticity, Polytechnic University.

Photoelasticity, Encyclopedia Britannica.

The picture below comes from the University of Missouri - Rolla.

History of CR-39
Perhaps the most important single development in the history of plastic lenses came out of an experimental program being conducted during World War II at the Columbia Southern Chemical Company, now the Chemical Division of PPG Industries. They were involved in the quest for a plastic substitute for window glass, and formulated a series of just under 200 experimental polymers. It is the 39th of these materials which we, and the whole industry, use today as the basis for virtually all plastic ophthalmic lenses. The material, commonly referred to as CR-39 (the 39th Columbia Resin), is allyl diglycol carbonate. It has the product advantage of being thermosetting rather than thermoplastic, so will not soften and distort at elevated temperatures. It must, however, be cast rather than molded. It’s most unique property, and the one which makes it so well suited to ophthalmic application, is its scratch resistance. It is by far the most scratch resistant of the optical plastics.

Interactive Guide to Strain Gage Technology

Inelastic Buckling

LOCTITE WORLDWIDE DESIGN HANDBOOK, 2nd Edition (Discusses adhesives and joints.)

3M Scotch-Weld Epoxy Adhesive DP-460 (Data Sheet)

Rotating Beam Fatigue Test Machine