Method for determining theoretical value dispersion coefficient of crack forming life of aircraft structure

The invention discloses a method for determining a theoretical value dispersion coefficient of the crack forming life of an aircraft structure. The method comprises the following steps: establishing a crack propagation direction coordinate identification line; determining the position of a fracture analysis measurement point; calculating the crack propagation rate of the fracture analysis measurement point position; calculating a crack propagation life test value; calculating a crack formation life test value; calculating a crack formation life theoretical value; and calculating a crack formation life dispersion coefficient, namely the crack formation life dispersion coefficient of the aircraft structure. According to the technical scheme, the adopted theoretical analysis method is correct, the engineering concept is clear, and the steps are clear; the method can be used for determining the aircraft structure crack formation life dispersion coefficient, and can also be used for determining a test piece crack