Page 77 - Fundamental of Engineering Design
P. 77
Modulus of elasticity (E)
E is the tendency of an object to deform along an axis when opposing forces
are applied along that axis; it is defined as the ratio of tensile stress to tensile
strain. Elastic materials always spring back into shape when released.
E = σ
ε
If P is the total tensile load in a bar, A its cross- sectional area, and L its length
0
, then
E = σ = /
ε /
0
Where e is the extension of the length L . Thus, the expansion is given by
0
e = 0
P= total tensile load
A= cross-sectional Area 77
L = Length
0
