This content is not included in
your SAE MOBILUS subscription, or you are not logged in.
Accelerated Fatigue Testing
Annotation ability available
Sector:
Language:
English
Abstract
The people reports data on block program fatigue testing of a simple cantilever specimen with a stress concentration, the specimen being made of SAE 1530 steel. The various programs investigated were based on a normal distribution with a crest factor of 4 and were aimed at accelerating fatigue testing.
From tests on programs with 4,8, and 16 stress levels, it was concluded that at least 8 stress loads were required to stimulate accurately the normal distribution. Tests in which various stress levels were omitted showed that stress levels S/σ< 1.75 contributed nothing to fatigue damage, and consequently they could be omitted from the program, resulting in a saving of 87% in testing time. Stress level in range 1.75 S/σ<=4 had a damaging effect, and even the one of S/σ=4 in each full program of 4000 cycles caused significant damage. This indicates the great importance of the choice of crest factor.
Authors
Citation
Carse, A. and Crossland, B., "Accelerated Fatigue Testing," SAE Technical Paper 720266, 1972, https://doi.org/10.4271/720266.Also In
References
- Gassner E. “Effects of Variable Load and Cumulative Damage on Fatigue in Vehicle and Aeroplane Structures.” Proc. of International Conference on Fatigue of Metals London Inst. of Mech. Eng. 1956 304
- Gassner E. Schutz W. “The Significance of Constant Load Amplitude Tests for the Fatigue Evaluation of Aircraft Structures.” Proc. of Conference on Full-scale Fatigue Testing of Aircraft Structures Plantema F. J. Schijve J. London Pergamon Press 1961
- Gassner E. “Performance Fatigue Testing with Respect to Aircraft Design.” Proc. of International Conference on Fatigue of Aircraft Structures 1956 128
- Haas T. “Loading Statistics as a Basis of Structural and Mechanical Designs.” The Engineers' Digest 23 1962
- Schijve J. “The Endurance under Program Fatigue Testing.” Proc. of Conference on Full-scale Fatigue Testing of Aircraft Structures Plantema F. J. Schijve J. London Pergamon Press 1961
- Naumann E. C. et al. “Axial Load Fatigue Tests of 2024-T3 and 7075-T6 Aluminum Alloy Sheet Specimens under Constant Variable Amplitude Loads.” NASA Technical Note D-212 1959
- Naumann E. C. Scholt R. L. “Axial Load Fatigue Tests using Loading Schedules based on Maneuver-Load Statistics.” NASA Technical Note D-1253 1962
- Carse A. M. Crossland B. “Programmed Fatigue Testing of Small Cantilever Specimens.”
- Carse A. M. “An Investigation into Testing Procedures simulating the Effect of Fatigue on Small Steel Specimens subjected to Random Loading.” University of Belfast 1970
- Naumann E. C. “Evaluation of the Influence of Load Randomization and of Ground-air-ground Cycles on Fatigue Life.” NASA Technical Note D-1584 1964
- Conover J. C. Jaeckal H. R. Kippola W. J. “Simulation of Field Loading on Fatigue Testing.” SAE Transactions 75 1967