Related Resources: calculators
Flat Rectangular Plate Loading 2/3 of Plate from Fixed Edge Stress and Deflection Equation an
Flat Rectangular Plate; one edge fixed, opposite edge free, remaining edges simply supported loading 2/3 of plate from fixed edge Stress and Deflection Equation and Calculator.
Per. Roarks Formulas for Stress and Strain Formulas for flat plates with straight boundaries and constant thickness
Rectangular plate; one edge fixed, opposite edge free, remaining edges simply supported loading 2/3 of plate from fixed edge.
Rectangular plate; one edge fixed,
opposite edge free, remaining edges simply supported. 
Uniform loading
over 2/3 of plate from fixed edge. 
Stress Maximum at center of fixed edge:
and  R = γqb 
Symbols used:
q = Applied Load or Force to Flat Area of Plate (N/m^{2}, lbs/^{2})
v = Poisson’s ratio (assumed to be 0.2)
t = plate thickness, (m, in)
a = plate length, (m, in)
b = plate width, (m, in)
σ = stress, (N/m^{2}, lbs/in^{2})
R = Reaction force per unit length (N/m, lbs/in) normal to the plate surface exerted by the boundary support on the edge of the plate.
β = Constant From Table A
γ = Constant From Table A
Table A
a/b

0.25

0.50

0.75

1.0

1.5

2.0

3.0

β

0.044

0.161

0.298

0.454

0.730

0.932

1.158

γ

0.183

0.348

0.466

0.551

0.645

0.681

0.689

Reference:
Roarks Formulas for Stress and Strain, 7th Edition