All-crack remanufacturability evaluation for blade with surface crack

Remanufacturing repair has been applied as a promising technology to extend the fatigue life of damaged components. For the compressor blade with shallow surface crack, crack can be directly repaired by crack arrest and healing technology. However, for the blade with macrosurface crack, a surface notch will be generated by crack grinding process and then repaired by laser cladding technology. Therefore, there are essential differences in the remanufacturability evaluation methods for blade with shallow cracks or macrocracks. In this study, the remanufacturability evaluation methods that can be suitable for the blade with any depth surface crack are studied. Firstly, remanufacturability evaluation for shallow crack is introduced based on fracture mechanics. Secondly, remanufacturability evaluation based on surface notch is established for the blade with macrocrack. It consists of preliminary remanufacturability evaluation, remanufacturability evaluation based on residual fatigue life and remanufacturability evaluation based on fatigue damage. Finally, combined with the remanufacturability evaluation for shallow crack and macrocrack, all-crack remanufacturability evaluation is proposed that suitable for the blade with any depth surface cracks. With the assistance of all-crack remanufacturability evaluation, the potential fatigue performance of cracked blades can be reused furthest and reduce the waste of resources as much as possible.