Callister - An introduction - 8th edition

Summary • 187
6.15 s T F True stress 170
A i
6.16 T ln l i
True strain 170
l 0
6.19
s T K n T
True stress and true strain (plastic
region to point of necking)
171
6.20a
6.20b
TS1MPa2 3.45 HB
TS1psi2 500 HB
Tensile strength from Brinell hardness 179
6.24 s w s y
Safe (working) stress 183
N
List of Symbols
Symbol
A 0
A f
A i
E
F
HB
K
l 0
l f
l i
N
n
TS
x , y
z
y
Meaning
Specimen cross-sectional area prior load application
Specimen cross-sectional area at the point of fracture
Instantaneous specimen cross-sectional area during load
application
Modulus of elasticity (tension and compression)
Applied force
Brinell hardness
Material constant
Specimen length prior to load application
Specimen fracture length
Instantaneous specimen length during load application
Factor of safety
Strain-hardening exponent
Tensile strength
Strain values perpendicular to the direction of load application
(i.e., the transverse direction)
Strain value in the direction of load application (i.e., the
longitudinal direction)
Yield strength
Processing/Structure/Properties/
Performance Summary
In this chapter we defined and explained the types of deformation that metal alloys
experience (elastic and plastic), as well as the associated properties (modulus
of elasticity, yield strength, hardness, etc.). In order to improve the mechanical characteristics
of metal alloys [e.g., steel (Chapter 10)], it is first necessary to understand
what these properties represent. The following diagram illustrates this relationship
for these materials.
Iron–Carbon
(Steel) Alloys
(Processing)
Definitions of mechanical
Mechanical properties of
properties
iron–carbon alloys
(Chapter 6) (Chapter 10)