Beam Deflection and Stress Formula and Calculators
Structural Beam Deflection, Stress, Bending Equations and calculator for a Beam Fixed at Both Ends with Uniform Loading.
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General Stress at any Given Point
Stress at Critical Locations/Points
Maximum Stress (at fixed ends)
Stress is zero at:
x = 0.7887l
and
x = 0.2113l
The greatest negative stress (at center)
Deflection at any Point
Critical Deflections
Maximum Deflection (Center of Beam)
Where:
E = 
Modulus of Elasticity 
psi 
(N/m^{2)} 
I = 
Moment of Inertia 
in^{4} 
(m^{4)} 
W = 
Load 
lbs 
(N) 
s = 
Stress at the crosssection being evaluated 
Lbs/in^{2} 
(N/m^{2}) 
y = 
Deflection 
inches 
(m) 
x = 
Some distance as indicated 
inches 
(m) 
u = 
Some distance as indicated 
inches 
(m) 
a, b = 
Some distance as indicated 
inches 
(m) 
L = 
Some distance as indicated 
inches 
(m) 
= 
Some distance as indicated 
inches 
(m) 
Z = 
section modulus of the crosssection of the beam 


Z = 
I distance from neutral axis to extreme fiber
(edge) 


 Please note letter "" (lower case "L") is different than "I" (Moment of Inertia).
 Deflections apply only to constant cross sections along entire length.
References:
 Any Machinery's Handbook published since 1931 or,
 Machinery's Handbook, 21st Edition
 Machinery's Handbook, 23st Edition
 Machinery's Handbook, 27st Edition
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