• Review Points
• Homework preview (3.1.1, 3.1.2)
• Glossary of Variables (see TOC)
• Sample Quizzes (see Course Sampler from TOC)

Topics

Mechanics of Materials

• The response of materials to load.
• Force-deformation relationships.
• The key to understanding the physical world

Richard Feynman's Observation

Attempting to distill humankind's knowledge of the physical world to its barest essence, Nobel laureate Richard Feynman once posed the following question: If all scientific knowledge were lost in a cataclysm, what single statement would best preserve the most information to the next generations of creatures? How could we best pass on our understanding of the world? He offered the following answer [J. Gleik, Genius, 1993, p. 37]:

All things are made of atoms--little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another.

Neutral	Tension	Compression

Materials Testing

• Measuring relationships of force and displacement intensity

  
  VT

• Material failure

  
  VT

A deep, intuitive appreciation for the inherent cussedness of materials and structures is one of the most valuable accomplishments an engineer can accomplish.

--J.E. Gordon
Structures, 1978, p. 63

Key Terms

• Linear Elastic
• Modulus of elasticity
• Strain
• Normal Strain
• Shear Strain
• Racking
• Stress
• Normal Stress
• Shear Stress
• Elastic Limit
• Ductility
• Brittle
• Yield stress
• Yield strain