Description: through 3D FEM to study with limited thickness of plate hole hole edge of the stress field, identify the stress concentration factor with the plate thickness, the radius hole of the relationship between also analyzed the edge of the hole three-dimensional and three-dimensional stress extent constrained the size of the area. The results showed : Stress from the restrictive factor in the board faced the greatest, and the surface of 0, the three-dimensional effect of the length of the regional thickness of about half of the stress concentration factor along the thickness of the distribution is uneven, and the location of its maximum thickness and the limited thickness of the slab surface stress concentration factor and the maximum value is greater than or plane stress level plane strain, the
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