Accession Number:

ADA063300

Title:

Three-Dimensional Photoelastic Stress Analysis of the Dovetail Region of the TF-30 Turbine Engine's Third-Stage Fan.

Descriptive Note:

Final rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

• Parks,V. J.
• Sanford,R. J.

Report Date:

1978-12-29

Pagination or Media Count:

32.0

Abstract:

Three-dimensional photoelastic analysis of the diskblade dovetail region of the TF-30 turbine engines third-stage fan indicates peak stresses in the disk and blade fillets that are an order of magnitude greater than the average stress in the neck of the disk lug. Maximum stress concentrations found in the fillets of the disk lugs for representative loads are 9.6 for centrifugal load 12.6 for centrifugal load with 12 circumferential component and 10.6 for centrifugal load with an 18 antiplane component. The addition of circumferential or antiplane bending components to the centrifugal load increased the peak stress and shifted it toward the region of the fillet where fractures have been observed. The analysis gives quantitative indication of the significance of bending in the failure of disk lugs. Author

Descriptors:

• *TURBOFAN ENGINES
• *STRESS ANALYSIS
• *PHOTOELASTICITY
• LOADS(FORCES)
• BENDING
• THREE DIMENSIONAL
• FANS
• DISKS
• FAILURE(MECHANICS)
• STAGING
• STRESS CONCENTRATION
• LUGS

Subject Categories:

• Mechanics
• Jet and Gas Turbine Engines

Distribution Statement:

APPROVED FOR PUBLIC RELEASE