This paper summarizes recent enhancements to a probabilistic damage tolerance software code, DARWINTM, that can be used for design certification of aircraft jet engine titanium disks/rotors that may contain melt-related anomalies. Evaluations of DARWINTM by engine manufacturers are also discussed, including comparisons with existing codes for accuracy and time efficiency. In addition, relevant test results, including various fatigue tests on material containing melt-related anomalies, are summarized.

Issue Section:
Technical Papers
Keywords:
aerospace engines, gas turbines, rotors, probability, aerospace computing, fatigue testing
Topics:
Aircraft, Design, Disks, Fracture mechanics, Rotors, Probability, Fracture (Materials), Fatigue testing, Risk, Titanium, Engines, Turbines
1.
Leverant, G. R. et al., 1997, “A Probabilistic Approach to Aircraft Turbine Rotor Material Design,” ASME Paper No. 97-GT-22.
2.
Enright, M. P., and Wu, Y.-T., 2000, “Probabilistic Fatigue Life Sensitivity Analysis of Titanium Rotors,” Proceedings, 41st Structures, Structural Dynamics, and Materials Conference, Atlanta GA, Apr. 3–6.
3.
Millwater, H. R. et al., 2000, “A Probabilistically-Based Damage Tolerance Analysis Computer Program for Hard Alpha Anomalies in Titanium Rotors,” ASME Paper No. 2000-GT-0421.
4.
Leverant, G. R. et al., 2000, “Turbine Rotor Material Design,” Federal Aviation Administration Report DOT/FAA/AR-00/64.
5.
Wu, Y.-T., Millwater, H. R., and Enright, M. P., 2000, “Efficient and Accurate Methods for Probabilistic Analysis of Titanium Rotors,” Proceedings, 8th ASCE Specialty Conference on Probabilistic Mechanics and Structural Reliability, South Bend, IN, July 24–26, CD-ROM Proceedings Paper PMC2000-221.
6.
Wu, Y.-T., Enright, M. P., Millwater, H. R., Chell, G. G., Kuhlman, C. J., and Leverant, G. R., 2000, “Probabilistic Methods for Design Assessment of Reliability With Inspection (DARWIN™),” Proceedings, 41st Structures, Structural Dynamics, and Materials Conference, Atlanta GA, Apr. 3–6.
7.
Millwater, H. R., Enright, M. P., Fitch, S., 2002, “A Convergent Probabilistic Technique for Risk Assessment of Gas Turbine Disks Subject to Metallurgical Defects,” 43rd Structures, Structural Dynamics, and Materials Conference, Denver, CO, Apr. 22–25.
8.
Li
,
S.
,
Mear
,
M. E.
, and
Xiao
,
L.
,
1998
, “
Symmetric Weak-Form Integral Equation Method for Three-Dimensional Fracture Analysis
,”
Comput. Methods Appl. Mech. Eng.
,
151
, pp.
435
–
459
.
9.
Subteam to the Aerospace Industries Association Rotor Integrity Subcommittee, 1997, “The Development of Anomaly Distributions for Aircraft Engine Titanium Disk Alloys,” 38th AIAA/ASME/ASCE/AHS/ASC SDM Conference, pp. 2543–2553.
10.
McClung, R. C., Lawless, B. H., Gorelik, M., Date, C., Gill, Y., and Piascik, R. S., 1999, “Fatigue Crack Growth of Titanium Rotor Alloys in Vacuum and Air,” Fatigue Behavior of Titanium Alloys, R. R. Boyer, D. Eylon, and G. Lutjering, eds., The Minerals, Metals, and Materials Society, pp. 211–218.
11.
McKeighan, P. C., Nicholls, A. E., Perocchi, L. C., and McClung, R. C., 2001, “Sensing Crack Nucleation and Growth in Hard Alpha Defects Embedded in Ti-6Al-4V Alloy,” Nontraditional Methods of Sensing Stress, Strain and Damage in Materials and Structures: Second Volume, ASTM STP 1323, G. F. Lucas, P. C. McKeighan, and J. S. Ransom, eds., American Society for Testing and Materials, pp. 15–35.
12.
Brooksbank
,
D.
, and
Andrews
,
K. W.
,
1972
, “
Stress Fields Around Inclusions and Their Relation to Mechanical Properties
,”
Journal of the Iron and Steel Institute
,
210
, pp.
246
–
255
.
Copyright © 2004
 by ASME
You do not currently have access to this content.