A new vibration-based multiaxial fatigue testing methodology for assessing high-cycle turbine engine material fatigue strength at various stress ratios is presented. The idea is to accumulate fatigue energy on a base-excited plate specimen at high-frequency resonant modes and to complete a fatigue test in a much more efficient way at very low cost. The methodology consists of (1) a topological design procedure, incorporating a finite element model, to characterize the shape of the specimens for ensuring the required stress state/pattern, (2) a vibration feedback empirical procedure for achieving the high-cycle fatigue experiments with variable-amplitude loading, and finally (3) a yielding procedure for achieving various uniaxial stress ratios. The performance of the methodology is demonstrated by the experimental results from mild steel, 6061-T6 aluminum, and Ti-6Al-4V plate specimens subjected to fully reversed bending for both uniaxial and biaxial stress states.

Issue Section:
Gas Turbines: Structures and Dynamics
Keywords:
fatigue testing, internal stresses, gas turbines, finite element analysis
Topics:
Cycles, Fatigue, Fatigue testing, Stress, Vibration, Finite element model
1.
Goodman, J., 1899, Mechanics Applied to Engineering, Longmans, Green, and Co., London.
2.
Nicholas
,
T.
, and
Zuiker
,
J. R.
,
1996
, “
On the Use of the Goodman Diagram for High Cycle Fatigue Design
,”
Int. J. Fract.
,
80
, pp.
219
–
235
.
3.
Nicholas, T., and Maxwell, D. C., 2002, “Mean Stress Effects on the High Cycle Fatigue Limit Stress in Ti-6Al-4V,” Fatigue and Fracture Mechanics: Vol. 33, ASTM STP 1417, Reuter, W. G., and Piascik, R. S., eds., American Society for Testing and Materials, West Conshohocken, PA, pp. 476–492.
4.
Shen, M.-H. H., Seidt, J., George, T., Cross, C., Whaley, P. W., and Nicholas, T., 2001, “Development of A Novel Method for Evaluating Material Behavior under Turbine Engine Operating Conditions, Part I: Design of Accelerated HCF Testing Procedures,” 6th National Turbine Engine High Cycle Fatigue Conference, Jacksonville, FL, March 5-8.
5.
Shen, M.-H. H., George, T., Seidt, J., Nicholas, T., and Cross, C., 2001, “Development of A Novel Method for Evaluating Material Behavior under Turbine Engine Operating Conditions, Part II: An Empirical Vibration-Based Fatigue Assessment Framework,” 6th National Turbine Engine High Cycle Fatigue Conference, Jacksonville, FL, March 5-8.
6.
Seidt, J., 2001, “Development of a Novel Vibration Based High Cycle Fatigue Test Method,” M.S. thesis, The Ohio State University, Columbus, OH.
7.
Maxwell, D. C., and Nicholas, T., 1999, “A Rapid Method for Generation of a Haigh Diagram for High Cycle Fatigue,” Fatigue and Fracture Mechanics: Vol. 29, ASTM STP 1321, T. L. Panontin, and S. D. Sheppard, eds., American Society for Testing and Materials, West Conshohocken, PA, pp. 626–641.
8.
Morrissey
,
R. J.
,
Golden
,
P.
, and
Nicholas
,
T.
, “
The Effects of Stress Transients on the HCF Endurance Limit
,”
Int. J. Fatigue
,
25
(
9–11
), pp.
1125
–
1133
.
Copyright © 2006
 by ASME
You do not currently have access to this content.