User:Eas4200c.f08.aero6.behnke/nothing

The following information is from the EAS4200c lectures beginning on August 25, 2008 to September 5, 2008.

Leactures 1-4: 8/25/2008 - 9/1/2008 For this class we will be submitting homework through Wikiversity. The homework assignments will include lecture summaries, assigned homework problems, and extra group contributions. The advantage to submitting assignments this way is that the knowledge can be shared.

Lecture 5: 9/3/2008 When designing aircraft, we want it to be lightweight, and have high stiffness and strength. Stiffness can be defined as the resistance of a body to deformation. It is mathematically defined as (insert eqn here sigma = E*epsilon)

where E is Younge's Modulus, sigma is stress, and epsilon is strain. A large value of E corresponds to high stiffness. For brittle materials the stress vs. strain curve is similar to that of figure 1. For metals, the stress vs. strain curve is similar to that of figure 2.