Method of and apparatus for measuring stiffness

摘要

In a testing machine a test piece and a reference piece having a known spring constant are superposed with fulcrums interposed between the opposite ends thus establishing a mirror image relationship. A load is applied to the center of the assembly by means of an elastic ring thereby creating a definite relative displacement between the test piece and the reference piece and the relative displacement is measured to determine the bending stiffness of the test piece. According to modified embodiments the torsional stiffness and tension can be measured.