SBIR/STTR Research Award
FATIGUE LIFE PREDICTION BASED ON THREE-DIMENSIONAL STRESS ANALYSIS
Award amount
$453,800Program and phase
SBIR · Phase IIAward year
1989Award details
- Awarding agency
- Department of Defense
- Branch
- Navy
- Recipient company
- Terra Tek Inc.
- Proposal award date
- Not reported
- Contract end date
- Not reported
- UEI
- Not reported
- Solicitation number
- Not reported
- Topic code
- Not reported
Research abstract
THE NAVY IS DEVELOPING METHODS TO DETERMINE THE SIZE AND TYPE OF DEFECTS IN HELICOPTER GEARBOXES. WITH THIS KNOWLEDGE A BETTER UNDERSTANDING OF THE FATIGUE-CRACK PROPAGATION CHARACTERISTICS OF THE GEARS AND BEARINGS WILL BE POSSIBLE AND ENHANCE THE ACCURACY IN PREDICTING THE FATIGUE LIFE. THE PURPOSE OF THIS PROPOSAL IS TO UNDERTAKE THIS STEP BY INVESTIGATING THE THREE-DIMENSIONAL STRESS DISTRIBUTION AND THE INFLUENCE OF THE THREE-DIMENSIONAL EFFECTS ON THE STRESS INTENSITY FACTORS ON THE FATIGUE LIFE OF GEARS AND BEARINGS. PROBABILISTIC FRACTURE MECHANICS IS TO BE APPLIED IN THE COUPLING OF THE STATISTIC DISTRIBUTION OF SIZE AND TYPE OF THE DEFECTS AND THE FATIGUE-CRACK PROPAGATION CHARACTERISTICS. EVENTUALLY, A COMPLETE COMPUTER MODEL FOR IMPROVED PREDICTION OF THE FATIGUE LIFE OF THE GEARBOXES WILL BE DEVELOPED IN PHASE II.
Technology keywords
Not reported