Method for measuring large-strain compression hardening curve of metal hyperbolic curve sample

The invention discloses a method for measuring a large-strain compression hardening curve of a metal hyperbolic curve sample. The invention belongs to the technical field of metal material mechanicalproperty testing. According to the method, a variable quantity of the radius of a minimum section of a hyperbolic curve sample in the compression process and a borne load are measured, and then a correction formula is utilized to acquire a corrected stress-strain curve. A corrected simulated load displacement curve and a corrected test load displacement curve are well overlapped, and a maximum error rate does not exceed 5%. According to the method, errors caused by drum shapes due to friction when existing compression tests are large in strain are avoided, an accurate stress-strain curve can be obtained, and the method has important significance in testing the mechanical properties of metal materials. 本发明公开的是一种金属双曲线试样的大应变压缩硬化曲线的测量方法,属于金属材料力学性能测试技术领域，本发明方法通过测量双曲线试样在压缩过程中最小截面处半径的变化量与所承受的载荷再通过修正公式获得修正后的的应力应变曲线。本发明获得修