Simulating and validating propagation of cracks in metal part of turboshaft engine, comprises performing digital simulation and validation by comparing characteristics of cracks in real part with characteristics of cracks in virtual part

摘要

The method comprises performing digital simulation by generating a virtual part comprising a structural defect when the part is subjected to mechanical and/or thermal constraints, simulating the propagation of the crack in the part subjected to the constraints and determining characteristics of the cracks appeared in the virtual part during simulation and/or a lifetime of the virtual part, and performing validation by carrying out coating and selective metal powder fusion on a real part comprising a structural defect, and subjecting the real part to mechanical and/or thermal constraints. The method comprises performing digital simulation by generating a virtual part comprising a structural defect such as crack to be propagated when the part is subjected to mechanical and/or thermal constraints, simulating the propagation of the crack in the part subjected to the constraints and determining characteristics of the cracks appeared in the virtual part during simulation and/or a lifetime of the virtual part, and performing validation by carrying out coating and selective metal powder fusion on a real part comprising a structural defect whose geometry is similar to the structural defect of the virtual part, subjecting the real part to mechanical and/or thermal constraints, determining the characteristics of the cracks appeared in the real part and/or the lifetime of the real part and comparing the characteristics of the cracks appeared in the real part with the characteristics of the cracks appeared in the virtual part and/or with the lifetime of the virtual part. The real part is realized successive deposition of metal powder coating and by selective fusion of the powder coating using a laser beam (11) or an electron beam. A zone of the powder coating is not molten to create a structural defect of given geometry. The realization of the real part comprises depositing a first part of the powder coating on a support (6) and fusing the powder coating in a definite zone by sweeping of the laser beam or the electron beam in the zone, depositing of a second part of the powder coating and fusing the powder layer in a part of the zone, and depositing of a third part of the powder coating and fusing the powder coating in the zone as the powder coating of an upper part of the second part, where the structural defect is formed in the real part by a cavity filled with powder that is output from of a lower part of the second part. Two successive sweepings of the same zone are carried out by the laser beam or the electron beam at the time of the realization of the real part. The real part is subjected with two tractive efforts of different intensities in a cyclic manner to generate and propagate cracks.