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Space shuttle main engine high pressure fuel turbopump turbine blade cracking
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lee, Henry |
| Copyright Year | 1988 |
| Description | The analytical results from two-dimensional (2D) and three-dimensional (3D) finite element model investigations into the cracking of Space Shuttle Main Engine (SSME) High Pressure Fuel Turbopump (HPFTP) first- and second-stage turbine blades are presented. Specifically, the initiation causes for transverse cracks on the pressure side of the firststage blade fir tree lobes and face/corner cracks on the downstream fir tree face of the second-state blade are evaluated. Because the blade material, MAR-M-246 Hf (DS), is highly susceptible to hydrogen embrittlement in the -100 F to 400 F thermal environment, a steady-state condition (full power level = 109 percent) rather than a start-up or shut-down transient was considered to be the most likely candidate for generating a high-strain state in the fir tree areas. Results of the analyses yielded strain levels on both first- and second-stage blade fir tree regions that are of a magnitude to cause hydrogen assisted low cycle fatigue cracking. Also evident from the analysis is that a positive margin against fir tree cracking exists for the planned design modifications, which include shot peening for both first- and second-stage blade fir tree areas. |
| File Size | 9824302 |
| Page Count | 57 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19890015064 |
| Archival Resource Key | ark:/13960/t2m66dd70 |
| Language | English |
| Publisher Date | 1988-05-01 |
| Access Restriction | Open |
| Subject Keyword | Spacecraft Propulsion And Power Fatigue Life Fracture Mechanics Turbine Blades Two Dimensional Models Shot Peening Computerized Simulation Engine Parts Fuel Pumps Finite Element Method Cracks Turbine Pumps Friction Fatigue Materials Space Shuttle Main Engine Strain Distribution Cracking Fracturing Three Dimensional Models Hydrogen Embrittlement Crack Initiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Technical Report |
