ANALYTICAL MODELING OF FATIGUE LIFE ON ROD END BEARING SYSTEM

Award Information
Agency:
Department of Defense
Amount:
$50,000.00
Program:
SBIR
Contract:
N/A
Solitcitation Year:
N/A
Solicitation Number:
N/A
Branch:
Air Force
Award Year:
1990
Phase:
Phase I
Agency Tracking Number:
13070
Solicitation Topic Code:
N/A
Small Business Information
Terra Tek Inc
420 Wakara Wy, Salt Lake City, UT, 84108
Hubzone Owned:
N
Woman Owned:
N
Socially and Economically Disadvantaged:
N
Duns:
N/A
Principal Investigator
 Dr Jian-juei Wang
 (801) 584-2459
Business Contact
Phone: () -
Research Institution
N/A
Abstract
CURRENTLY, AS REPORTED IN PROGRAM SOLICITATION 90.1 BY THE AIR FORCE, THE SPECTRUM OF BEARING AND BEARING LINER MATERIALS USED IN THE AIRCRAFT BEARING SYSTEMS BEHAVE IN AN UNEXPECTED WAY WHEN SUBJECTED TO CYCLIC LOADINGS. TO INVESTIGATE THE PROBLEM AND BETTER PREDICT THE FATIGUE LIFE OF THIS ROD AND BEARING SYSTEM, FUNDAMENTAL ANALYSES OF STRESS DISTRIBUTIONS, STRESS INTENSITY FACTORS, FATIGUE CHARACTERISTICS, AND WEAR AND FRACTURE ARE REQUIRED. AN ANALYTICAL MODEL TO PREDICT THE FATIGUE LIFE OF ROD END BEARING SYSTEM IS PROPOSED FGOR THE PHASE I WORK. SPECIFICALLY, THE STRESS FIELD FOR THE ASSUMED HERTZIAN LOADING AROUND AN ASPERITY IS CALCULATED, ALONG WITH A CORRECTION FACTOR TO ACCOUNT FOR THE THREE-DIMENSIONAL EFFECTS; THE MODE II (SHEARING MODE) STRESS INTENSITY FACTORS ARE THEN CALCULATED FROM TEH OBTAINED STRESS FIELD; THE FATIGUE LIFE IS FINALLY MODELED BASED ON THE CHARACTERISTICS OF CYCLIC LOADING AND FRACTURE GROWTH BY USING THE CALCULATED STRESS INTENSITY FACTORS. FEASIBILITY OF THIS MODEL WILL BE EXAMINED AND DEMONSTRATED FOR VARIOUS TYPES OF INITIAL MICRO-CRACKS, E.G. THE VERTICAL EDGE CRACK, THE INCLINED EDGE CRACK, THE INTERIOR HORIZONTAL CRACK, THE INTERIOR VERTICAL CRACK AND THE INTERIOR INCLINED CRACK.

* information listed above is at the time of submission.

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