Evaluation method for rough tensile fracture rate of tire cord steel wire rod

The invention discloses a tire cord steel wire rod rough tensile fracture rate evaluation method which specifically comprises the following steps: calculating the carbon equivalent of a tire cord steel wire rod, and grading the wire rod; performing multiple groups of unidirectional torsion tests on the wire rod to obtain the actual number of torsion turns of the wire rod; re-sampling the wire rod, and carrying out multiple groups of repeated bending tests to obtain the actual repeated bending times of the wire rod; and according to the grading of the wire rod, the torsion test result and the repeated bending test result, calculating the coarse tensile failure parameter of the wire rod, and evaluating the coarse tensile failure rate of the wire rod according to the coarse tensile failure parameter. The method has the beneficial effects that the relationship between the internal structure of the wire rod and the coarse tensile failure is quantified by comprehensively considering the steel type, the torsion and