Strain measuring device for small relative strain, has strain gauge and part under test arranged on axis of symmetry through C-frame, and gap providing overload protection

摘要

The measuring device comprises a symmetrical structure with a part under test (1) and strain gauge (8) arranged on the axis of symmetry through the C-frame of the measuring device. The C-frame, threaded spindles (3,5) and measuring heads (4,6) are made of materials having similar linear temperature expansion coefficients. Overload protection (9) is provided in the form of a gap that closes with increasing measurement force.