Verification of Life Prediction Methods for Aging Aircraft Structures

1997 ◽  
Author(s):  
J. H. Elsner ◽  
K. L. Boyd ◽  
J. A. Harter
Keyword(s):  
Life Prediction ◽  
Prediction Methods ◽  
Aircraft Structures ◽  
Aging Aircraft

scholarly journals Design of experiments for verification of computational life prediction methods

2019 ◽  
Vol 18 (3) ◽  
pp. 143-154
Author(s):  
O. V. Samsonova ◽  
K. V. Fetisov ◽  
I. V. Karpman ◽  
I. V. Burtseva
Keyword(s):  
Life Prediction ◽  
Low Cycle Fatigue ◽  
Turbine Engines ◽  
Prediction Methods ◽  
Gas Turbine Engines ◽  
Loading Conditions ◽  
Load History ◽  
Strain Behavior ◽  
Before And After ◽  
Two Stages

The failure of heavily loaded rotating parts of aviation gas turbine engines may bring about dangerous consequences. The life of such parts is limited with the use of computational and experimental methods. Computational life prediction methods that are used without carrying out life-cycle tests of engine parts or assemblies should be substantiated experimentally. The best option for verifying the computational methods is to use the results of cyclic tests of model disks. These tests make it possible to reproduce loading conditions and surface conditions that correspond to those of real disks, and the data on the load history and material properties make it possible to simulate stress-strain behavior of disks under test conditions by calculation. This paper shows the process of planning such tests. It is assumed that the tests will be carried out in two stages - before and after the initiation of a low-cycle fatigue crack. A number of criteria are formulated that the geometry of model disks and their loading conditions are to satisfy. Based on these criteria, model disks were designed and the conditions for their testing were selected.

Validation of Inelastic Analysis by Full-Scale Component Testing

1987 ◽  
Vol 109 (1) ◽  
pp. 42-49 ◽  
Author(s):  
D. S. Griffin ◽  
A. K. Dhalla ◽  
W. S. Woodward
Keyword(s):  
Life Prediction ◽  
Elevated Temperatures ◽  
Full Scale ◽  
Prediction Methods ◽  
Material Models ◽  
Component Testing ◽  
Inelastic Analysis ◽  
Creep Buckling ◽  
Design Requirements ◽  
Thermal Striping

This paper compares theoretical and experimental results for full-scale, prototypical components tested at elevated-temperatures to provide validation for inelastic analysis methods, material models, and design limits. Results are discussed for piping elbow plastic and creep buckling, creep ratcheting, and creep relaxation; nozzle creep ratcheting and weld cracking; and thermal striping fatigue. Comparisons between theory and test confirm the adequacy of components to meet design requirements, but identify specific areas where life prediction methods could be made more precise.

Life Prediction Techniques for Variable Amplitude Multiaxial Fatigue—Part 2: Comparison With Experimental Results

1996 ◽  
Vol 118 (3) ◽  
pp. 371-374 ◽  
Author(s):  
C. H. Wang ◽  
M. W. Brown
Keyword(s):  
Fatigue Test ◽  
Life Prediction ◽  
Room Temperature ◽  
Multiaxial Fatigue ◽  
Experimental Results ◽  
Prediction Methods ◽  
Variable Amplitude ◽  
Prediction Techniques ◽  
Tubular Specimens ◽  
Random Fatigue

An extensive multiaxial random fatigue test programme was conducted at room temperature using tubular specimens. Experiments were performed under combined tension/torsion and triaxial loading, covering proportional and nonproportional variable amplitude loading cases. The two proposed life prediction methods discussed in Part 1 are evaluated using the experimental results, demonstrating that these two methods provide satisfactory predictions.

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