Mechanical Engineering

Symbol Definition Remarks

E

Modulus of elasticity; Young’s modulus;

E

=

s

/

e

Hooke’s law;

T

and

e

effects small

G

Shear modulus of elasticity;

T

and

e

effects small

v

Poisson’s ratio;

T

and

ep

effects small

s

Proportional limit; at onset of noticeable yielding (or at onset of nonlinear elastic behavior)

Flow property; inaccurate;

T

and

e

effects large

s

0.2% offset yield strength (but yielding can occur at

s

<

s

if

s

<

s

) Flow property; accurate;

T

and

e

effects large

s

True fracture strength; Fracture property;

T

and

e

effects medium

e

True fracture ductility; Max.