Understanding Different Factors Affecting Supersonic Particle Deposition
(SPD) repaired Al 7075-T651 Plate for Structural Restoration
Saravanan R Arunachalam and Scott Fawaz
The Supersonic Particle Deposition (SPD) process has been developed substantially over the past decade and is currently used in a wide variety of applications, particularly geometric restoration. However, the SPD repair for structural applications is still under development and requires extensive testing and qualification. Further, a fundamental understanding of the driving force and micro-mechanism involved in the failure mechanism, environmental assisted cracking (EAC) is still not matured, and, not completely understood in the SPD coating. Thus, this project focuses on the development of experimental data for SPD repaired Al 7075-T651 0.25” plate and understanding the failure modes and mechanism involved. To study the structural behavior of the SPD coated 7075 Al, both static and fatigue performance were evaluated in ambient and humid environments. The study involves simulating a 20% thickness loss by milling Al 7075 master plates (9.1” x 8.75”) followed by depositing Al 7075 spray atomized powder using the SPD process. The following figure shows a schematic of a high pressure SPD process similar to the one used in our study.