ME 412 Class No. 14937 S. F. Felszeghy		Spring 2009
	STRENGTH OF MATERIALS LABORATORY II

Week	Date	Experiment
1	Apr. 2	Photoelasticity (Demo only)
2	Apr. 9	Photoelasticity
3	Apr. 16	Photoelasticity
4	Apr. 23	Photoelasticity
5	Apr. 30	Compressed Split-Ring
6	May 7	Shear Center of Channel Beam
7	May 14	Buckling of Columns
8	May 21	Adhesive-Bonded Joints
9	May 28	Fatigue
10	Jun. 4	Fatigue

References

• Information for Laboratory Report Preparation
  Standard Mechanical Engineering Laboratory Report Manual
  Report Cover and Check List for Content
  
  
• CSULA Library Books
  Budynas
  Juvinall
  Shigley
  Timoshenko
  
  
• PhotoStress Knowledge Base, Vishay Micro-Measurements.
  
• Photoelasticity, School of Mechanical & Aerospace Engineering, Nanyang Technological University, Singapore.
  
• Research in Automated Photoelasticity, Mechanical and Industrial Engineering, University of Toronto.
  
• Role of Biomechanics in Periodontal Therapy, UCLA.
  
• Photoelasticity, Encyclopedia Britannica.
  
• The picture below came from the University of Missouri - Rolla (now Missouri University of Science and Technology).
  

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.

Strain Gage Knowledge Base, by Vishay Micro-Measurements

Inelastic Buckling

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

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

Rotating Beam Fatigue Test Machine