The Young's modulus allows engineers[?] and other scientists to calculate the behavior of a material under load. For instance, it can be used to predict the amount a wire will extend under tension, or to predict the load at which a thin column will buckle[?] under compression. Some calculations also require the use of other material properties, such as the shear modulus[?], density or Poisson's ratio.
For many materials, Young's modulus is a constant over a range of strains. Such materials are called linear, and are said to obey Hooke's law. Examples of linear materials include steel, carbon fiber and glass. Rubber is a non-linear material.
Approximate Young's Moduli of Various Solids | |
Material | Young's modulus (E) in psi |
Soft cuticle of pregnant locust | 30 |
Rubber (small strain) | 1000 |
Shell membrane of egg | 1100 |
Human cartilage | 3500 |
Human tendon | 80,000 |
Wallboard | 200,000 |
Unreinforced plastics, polyethene, nylon | 200,000 |
Plywood | 1,000,000 |
Wood (along grain) | 1,000,000 |
Fresh bone | 3,000,000 |
Magnesium Metal | 6,000,000 |
Ordinary glasses | 10,000,000 |
Aluminum Alloys | 10,000,000 |
Brasses and Bronzes | 17,000,000 |
Iron and Steel | 30,000,000 |
Aluminum Oxide (sapphire) | 60,000,000 |
Diamond | 170,000,000 |
See also: Deformation, Stress, Strain
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