Letter Codes for Strength Calculation
The symbol Description
α (alfa) Angle in general reviews
a The side (a,b,c .), distance commonly
A The reaction in the strength calculations
B The reaction, whereby generally two reactions A and B
C Rigidity as the deflection/length ratio to the support length 1:1000, 1:200...,
Bearing's dynamic carrying capacity
C0 Bearing's static carrying capacity
d Diameter of the rivet or screw, thickness of the web plate
D Outer diameter of a body, the diameter of the rivet base etc.
e The edge distance from the center of gravity axle, eccentricity
E The Young's modulus of elasticity 20600 kN/cm2 (21000 kN/cm2)
ε (epsilon) Elongation of the rod when squeezed or pulled
φ (fii) The Golden Ratio 1.618
f Deflection, initial crookedness
F KN force (= 100 kg) => F10 corresponding to a load of 1000 kg
Fn The buckling force to strength measuring
Fv Pre-tightening force of a screw when installing
g Uniformly distributed dead load
The size effect number to strength measuring
Acceleration of free fall 9,82 m/s2 when a falling body
G Modulus of shear deformation (sliding factor) 8000 kN/cm2
Material weight in kg/m
h Height of the spar web
Profiled steel's nominal height
Generally height
I The second moment of area
Ix The second moment of area to x - x axis
Iy The second moment of area to y - y axis
µ (myy) Friction coefficient commonly
L Load length, lengthwise the girder or length generally
Ln Buckling length to strength measuring
L0 Length of origin
M Moment of the power to measuring the structural element
Mt Bending moment to measuring the structural element
Mv Torque when measuring the structural element
n Safety factor, number of steps in ratio queu
N Normal force to strength measuring
p The surface pressure as the general concept in whole defining
ρ Density
π (pii) Factor 3.14159 as a circle's circumference to its diameter
P Concentrated load and power to strength and energy definitions
r Smaller radius, especially to fatiguing measurement
R Larger radius, especially to fatiguing measurement
s Material thickness to strength defining
σ Tension in general, compression or tension
σm (sigma) The yield limit in material to strength defining
σM The breaking strength in material - The ultimate tensile strength
σn The nominal stress, buckling stress when strength defining
σt Bending stress to strength defining
σtsall Permitted bending stress when strength defining
σT Endurance limit for pulsating when strength defining
σv Resistance to torsion
σW Reversed fatique strength
Endurance limit for reversed stress
t Time commonly
τ (tau) The shearing stress commonly to strength defining
v Poisson's ratio (0,3 to steel) to strength defining
Wx Bending resistance to x - x axis
Wy Bending resistance to y - y axis
= ; # Equivalent ; not equivalent
=> This results in
16.7.2015*08:40 (888 - 31)
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