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Uniformly Heated Rectangular Plate Stress Calculator and Equations

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Eq. 1

σ x 1 = E 1 / ( 1 μ 2 ) [ ϵ x + μ ϵ y ( 1 + μ ) α 1 ( T 1 T 0 ) ]

Eq. 2

σ y 1 = E 1 / ( 1 μ 2 ) [ ϵ y + μ ϵ x ( 1 + μ ) α 1 ( T 1 T 0 ) ]

Eq. 3

σ 2 = E 2 [ ϵ x α 2 ( T 2 T 0 ) ]

Eq. 4

σ 3 = E 3 [ ϵ y α 3 ( T 3 T 0 ) ]

Eq. 5

Σ F x = σ x 1 A x 1 + σ 2 A 2 = 0

Eq. 6

Σ F y = σ y 1 A y 1 + σ 3 A 3 = 0

Eq. 7

A x 1 = b t

Eq. 8

A 2 = 2 w t 2

Eq. 9

A y 1 = a t

Eq. 10

A 3 = 2 v t 3

Equations 5 and 6 can be solved simultaneously for Ex and Ey. Substituting back into equations 1,2,3, and 4, the stress at the edge of the members can be obtained.

Partially Restrained Square Plate
Figure 1 - Partially Restrained Rectangle Plate

Where

E1 = modulus of elasticity plate 1
E2 = modulus of elasticity frame plate 2
E3 = modulus of elasticity frame plate 3
α1 = coefficient of thermal expansion plate 1
α2 = coefficient of expansion frame plate 2
α3 = coefficient of expansion frame plate 3
εx = strain along x coordinate
εy = strain along y coordinate
T0 = reference temperature
T1 = temperature center plate
T2 = temperature frame plate 2
T3 = temperature frame plate 3
µ = Poisson's ratio
σx1 = stress
σx2 = stress
a = width
b = height
w = width of plate frame
v = width of plate frame
t1 = thickness plate 1
t2 = thickness plate 2
t3 = thickness plate 3

  • Bell Helicopter Structural Design Manual, 1977

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