To determine the load-deformation curve of large bodywork components (in this case a vehicle door) a widened version of a Zwick testing machine with two load cells (the load components are totaled) and a semi-cylindrical bending tool is used. As the components do not fail symmetrically along the length of the bending tool, a bending moment arises relative to the test axis. This presents no difficulty from a measuring point of view as the two load cells employed are insensitive to moments. The upper test area is equipped with specimen grips and an extensometer for standard tensile tests on metals.