INVESTIGATION OF FATIGUE FAILURE INITIATION AND PROPAGATION IN WIND-TURBINE-GRADE WOOD/EPOXY LAMINATE CONTAINING SEVERALVENEER JOINT STYLES

Award Information
Agency:
Department of Energy
Branch
n/a
Amount:
$484,138.00
Award Year:
1987
Program:
SBIR
Phase:
Phase II
Contract:
n/a
Agency Tracking Number:
3400
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
Gougeon Brothers, Inc.
P.o. Box X908, Bay City, MI, 48707
Hubzone Owned:
N
Minority Owned:
N
Woman Owned:
N
Duns:
n/a
Principal Investigator:
William D. Bertelsen
Principal Investigator
(517) 684-7286
Business Contact:
() -
Research Institution:
n/a
Abstract
FROM THE NASA/DOE MOD OA WIND ENERGY RESEARCH PROGRAM CAME THE FINDING THAT LAMINATED WOOD/EXPOSY COMPOSITE IS A LOW-COST CONSTRUCTION MATERIAL THAT MAY WITHSTAND THE LONGTERM SEVERE FATIGUE ENVIRONMENT OF THE ADVANCED WIND TURBINE BLADE. INCREASED ERRICIENCY AND RELIABILITY REQUIREMENTS PLACED ON THE NEXT GENERATION OF WIND MACHINES WILL CHALLENGE DESIGNERS, DEMANDING THEIR UNDERSTANDING OF THE MECHANISMS BY WHICH FAILURES ORIGINATE AND PROPAGATE IN SUCH COMPOSITES. PREVIOUS TESTING OR WOOD/EPOXY LAMINATES HAS SHOWN THAT THE JOINTS BETWEEN THE INDIVIDUAL VENEER SHEETS WITHIN THE LAMINATE ACT AS FAILURE INITIATION SITES WHICH LIMIT ITS LOAD-CARRYING CAPACITY. THE DETERIMENTAL EFFECT OF THESE JOINTS IS MOST FELT IN HIGH-CYCLE FATIGUE, WHICH IS OF KEY IMPORTANCE FOR RELIABLE, LONG LIFE WIND TURBINE COMPONENTS SUCH AS BLADES. THE STUDY OF HOW A MATERIAL BEHAVES UNDER REPEATED STRESS AROUND THE SITE OF A WELL-DEFINED, BUILT-IN DEFECT IS A TRADITIONAL METHOD IN MATERIALS SCIENCE FOR GAINING INSIGHT INTO FATIGUE-RELATED PROCESSES. THE PHASE I RESEARCH WILL ADVANCE THIS TECHNIQUETHROUGH IMPLEMENTATION OF A MOST HIGHLY INTEGRATED FATIGUE TEST MATRIX. THIS UNIQUE MATRIX WILL ALLOW ANALYSIS TO FOCUS SOLELY ON THE EFFECTS OF WELL-DEFINED SAMPLE DEFECTS IN THE FORM OF SEVERAL TECHNICALLY FEASIBLE VENEER SPLICE JOINT STYLES.

* information listed above is at the time of submission.

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