Method and test component for rotatable disc parts

Details Method and test component for rotatable disc parts Method and test component for rotatable disc parts

2008-07-15

2008-07-15

Frejd, Russell (Department: 2128)

Data processing: measuring, calibrating, or testing

Testing system

Of mechanical system

C703S001000, C703S002000, C703S007000, C702S042000, C702S179000

Reexamination Certificate

active

11220578

ABSTRACT:
Rotatable discs combined with turbine blades in engines must be tested for critical life analysis. Thus, consideration must be made as to life expectancy for such components as a result of tensile circumferential hoops as generated by the weight of blades under rotation as well as compressive axial stress as a result of thermal gradients during initial warm up. Previous testing arrangements have considered tensile circumferential hoop stress but not compressive axial stress combinations such as “Von Mises” stress. By provision of bend structures13, 223a bending moment is created about a base2, 22formed in a test component1, 21such that a bending moment force4, 24creates a bending moment in the test component1, 21. This bending moment results in a compressive axial stress reminiscent of that in a practical turbine engine disc as a result of initial thermal gradients. In such circumstances a more realistic testing of the component1, 21representative of a practical disc/blade combination is achieved.

REFERENCES:
patent: 6102664 (2000-08-01), Nguyen
patent: 6119818 (2000-09-01), Krumbeck
patent: 1 308 867 AB (1986-03-01), None
Cohen et al., R. Static Simulation for Deflections of a Compressor Disk by Gyroscopic Forces, Journal of the Society for Experimental Stress Analysis, SESA Spring Meeting, Apr. 1962, pp. 97-101.

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