# StructX > Resources > Stress and Strain > Shear Centers

## Assumptions and Limitations

The shear centre is a point where a shear force can act without producing any twist in the section under consideration. StructX has provided formulas for calculating the shear center of commonly encountered sections. Several assumptions have been made.

- Materials are considered to be homogeneous, isotropic and linear-elastic.
- Forces are evenly distributed over the cross-section and act through the centroid.
- Cross-sections are perpendicular to the longitudinal axis of the member.
- Plane sections before deformation remain plane after deformation.
- Stress and strain are linearly related and strains are small.