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Design of Weldments
List of Symbols and Definitions
58
Engineering
Undergraduate 3
08/30/2011

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Term

α

Definition
angular acceleration (radians/sec/sec); included angle of beam curvature (degrees); form factor
Term
Δ
Definition
perpendicular deflection (in.), bending (Δb) or shear (Δs)
Term

ε

Definition
unit strain, elongation or contraction (in./in.)
Term

 

εs

Definition
unit shear strain (in./in.)
Term

ν

Definition
Poisson's ratio (steel = .3 usually)
Term

ω

Definition
leg size of fillet weld (in.); rate of angular motion about an axis (radians/sec)
Term

φ

Definition
unit angular twist (radians/linear inch)
Term
Σ
Definition
sum
Term

σ

Definition
normal stress, tensile or compressive (psi); strength (psi)
Term

τ

Definition
shear stress (psi); shear strength (psi)
Term

θ

Definition
angle of twist (radians; 1 radian = 57.3 degrees); angle of rotation (radians); any specified angle
Term
a
Definition
area of section beyond plane where stress is desired or appplied (in.2); length of plate (in.); acceleration or deceleration (ft/min, ft/sec)
Term
b
Definition
width of section (in.); distance of area's center of gravity to referance axis (in.)
Term
c
Definition
distance from neutral axis to extreme fiber (in.)
Term
d
Definition
depth of section (in.); moment arm of force (in.); distance (in.)
Term
e
Definition
eccentrictiy of applied load (in.); total axial strain (in.); moment oarm of force (in.); effective width (in.)
Term
f
Definition
force per linear inch of weld (lbs/in.); horizontal shear force (lbs/in.); (vectorial) resultant force (lbs/in.):  allowable strength of weld (lbs/in.)
Term
g
Definition
acceleration of gravity (386.4"/ sec2)
Term
h
Definition
height; height of fall
Term
k
Definition
any specified constant or amplification factor
Term
m
Definition
mass
Term
n
Definition
distance of section's neutral axis from reference axis (in.); number of units in series
Term
p
Definition
internal pressure (psi)
Term
r
Definition
radius (in.); radius of gyration
Term
s
Definition
length of curved beam segment (in.)
Term
t
Definition
thickness of section (in.); time (min.); time interval (sec)
Term
u
Definition
material's tensile modulus of resilience (in.-lb/in.3)
Term
uu
Definition
material's ultimate energy resistance (in.-lb/in.3)
Term
w
Definition
uniformly distributed load (lbs/linear inch)
Term
x
Definition
length of moment arm (curved beams)
Term
y
Definition
distance of area's center of gravity to neutral axis of entire section (in.)
Term
A
Definition
area (in.2); total area of cross-section
Term
E
Definition
modulus of elasticity, tension (psi)
Term
Es
Definition
modulus of elasticity in shear (psi)
Term
Et
Definition
tangential modulus of elasticity (psi)
Term
Ek
Definition
kinetic energy
Term
Ep
Definition
potential energy
Term
F
Definition
total force (lbs); radial force (lbs)
Term
I
Definition
moment of inertia (in.4)
Term
J
Definition
polar moment of inertia (in.4)
Term
K
Definition
ratio of minimum to maximum load (fatigue); any specified constant
Term
L
Definition
length of member (in. or ft.); span between supports (in.)
Term
Le
Definition
effective length of column
Term
M
Definition
bending moment (in.-lbs)
Term
Mo
Definition
applied bending moment (in.-lbs)
Term
N
Definition
number of service cycles
Term
P
Definition
concentrated load (lbs)
Term
Q
Definition
shear center
Term
R
Definition
reaction (lbs); torsional resistance of member (in.4)
Term
S
Definition
section modulus (in.3) = I/c
Term
T
Definition
torque or twisting moment (in.-lbs)
Term
U
Definition
stored energy
Term
V
Definition
vertical shear load (lbs); shear reaction; velocity; volume
Term
W
Definition
total load (lbs); weight (lbs); total width (in.)
Term
C.G.
Definition
center of gravity
Term
HP
Definition
horsepower
Term
N.A.
Definition
neutral axis
Term
RPM
Definition
revolutions per minute
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