FATIGUE EFFECTS OF THERMOPLASTIC HELICOPTER COMPONENTS WITH EMBEDDED DELAMINATIONS

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$48,670.00
Award Year:
1990
Program:
SBIR
Phase:
Phase I
Contract:
n/a
Award Id:
12952
Agency Tracking Number:
12952
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
10016 S 51st St, Phoenix, AZ, 85044
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
Dr Gershon Yaniv
(602) 893-7533
Business Contact:
() -
Research Institution:
n/a
Abstract
THE USE OF THERMOPLASTIC MATERIALS IN ROTOR COMPONENTS MAY SIGNIFICANTLY REDUCE THE PROBLEM OF DELAMINATIONS AND INCREASE FATIGUE LIFE. HOWEVER, LITTLE IS KNOWN OF THE EFFECT THAT MANUFACTURING FLAWS, IMPURITIES, AND VOIDS HAVE ON ROTOR THERMOPLASTIC COMPONENTS STRENGTH AND STIFFNESS AFTER AN EXTENDED NUMBER OF FLIGHT HOURS. TWO MAIN OBJECTIVES ARE PROPOSED: (1) IDENTIFICATION OF CANDIDATE ROTOR COMPONENTS MOST LIKELY TO BENEFIT BY BEING FABRICATED FROM THERMOPLASTIC COMPOSITE MATERIALS, AND (2) GENERATION OF AN EXPERIMENTAL DATA BASE OF FATIGUE EFFECTS ON THERMOPLASTIC SPECIMENS WITH AND WITHOUT MANUFACTURING DEFECTS. A LITERATURE SURVEY WILL BE CONDUCTED TO FOCUS ON PROBLEMS SUCH AS LOCATIONS OF CRITICAL DELAMINATION AND IDENTIFICATION OF THE CANDIDATE COMPONENTS, CONVENIENCE OF FABRICATION OF CRITICAL ROTOR COMPONENTS WITH THERMOPLASTICS, AND BONDING/JOINING THEM WITH THE REST OF THE ROTOR PARTS. THE EXPERIMENTAL DATA BASE WILL BE GENERATED BY TESTING COUPONS. TO SIMULATE MANUFACTURING DEFECTS UPILEX-S(R) DISKS WILL BE EMBEDDED IN THE COUPONS. TENSION/TENSION FATIGUE S-N CURVES WILL BE CREATED FOR THREE THERMOPLASTIC MATERIALS WITH AND WITHOUT EMBEDDED DISKS TO DETERMINE THE RANGE OF THE CRITICAL DELAMINATION SIZE.

* information listed above is at the time of submission.

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