Residual life estimation of damaged structures exposed to high pressures and temperatures

• DOI: 10.1016/j.prostr.2023.07.123
• Publication Date: 2023-08-04T12:29:14Z
• Authors: Nikola Raičević; Aleksandar Grbović; Gordana Kastratović; Nenad Vidanović; Aleksandar Sedmak
• Keywords: Inconel; Service life; Position (finance)

This paper deals with the damage growth in High-Pressure Turbine (HPT) cooling holes of case assembly made Inconel 718. Several marks (cuts) were on into parent material during service due to non-skilled use Electrical Discharge Machining (EDM) workshop. After a certain time, returned workshop all EDM cracked. Since HPT is not repairable and only method for fixing this issue its replacement new or used one (which might be pretty expensive), it was decided numerical analysis estimate Paris coefficients 718, since number cycles crack from initial position known, based data obtained Firstly, finite element (FEM) conducted order simulate propagation match observed workshop, then multi-objective genetic algorithm – The standard response surface type - full second polynomials obtain required coefficients. objectives optimization length corresponding growth. Obtained residual life assembly.