A thin rectangular sheet with a central hole subject to tensile loading.

**Problem Type:**

Plane problem of stress analysis (plane stress formulation).

**Geometry:**

Plate thickness 5 mm

**Given:**

Young's modulus *E* = 207000 N/mm^{2};

Poisson's ratio ν = 0.3.

The uniform tensile loading (40 N/mm^{2}) is applied to the bottom edge of the
structure.

**Problem:**

Determine the concentration factor due to presence of the central opening.

**Solution:**

Due to mirror symmetry one quarter of the structure is presented, and internal boundaries are
restrained in *X* and *Y* directions respectively.

The concentration factor may be obtained from the loading stress (40 N/mm^{2}) and
the maximum computed stress (146 N/mm^{2}) as

*k* = 146 / 40 = 3.65.

See the *Stres1.pbm* problem in the Examples folder.