Anew analytical method was developed and reported here, which accepting the thickness change along the boundary of model and the coordinate values of photoelastic isochromatic fringe as the only parameters inputted to the personal computer, the Laplace's equation ∇∇2 (σ1+σ2) =0, and Poisson's equation ∇∇
2σ
y=∂∂
2 (σ
1+σ
2) /∂xx
2, ∇∇
2τ
xy=∂∂
2 (σ
1+σ
2) /∂
x∂
y, are changed into the finite difference equations, and σ
x, σ
v, τ
xy, σ
1, σ
2, and the direction of the principal stress θ
1, θ
2, are systematically solved by the iteration method. As an analytical example, the stress allalysis of a semi-infinite plate compressed by a square aluminum plate was carried out. Furthermore, a high precision comparator was used to measure the thickness change of the model. The boundary condition to determine the distribution of σ
y is approXimated equal to the principal stress σ
2, for the τ
xy the boundary condition is assumed to be 0.
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