Objectif THE AIM OF THIS PROJECT IS TO OBTAIN HIGH CYCLE FATIGUE DATA WITH RELEVANT VARIABLE AMPLITUDE LOADING FOR MATERIALS USED IN WINDTURBINES IN ORDER TO OBTAIN DESIGN AND SAFETY CRITERIA. IN COOPERATION BETWEEN THE DLR, ECN, AND NLR BY SUBCONTRACT A THREE-YEARS RESEARCH PROGRAMME IS SETTLED FOR THE FATIGUE TESTING OF SEVERAL WINDTURBINE MATERIALS AND SUBSTRUCTURES. AT ECN AN EXPERIMENTAL PROGRAMME IS CARRIED OUT TO INVESTIGATE THE EFFECT OF PRE-LOADING (HIGH-LOW STEP TESTS) ON THE CONSTANT AMPLITUDE FATIGUE PERFORMANCE OF GLASSFIBRE/POLYESTER COUPONS FOR TWO STRESS RATIOS, I.E. R=0.1 AND R=-1. THE STIFFNESS DEGRADATION IS MONITORED ON-LINE. THE RESULTS SHOW CONTRARY TO THE EXPECTATION, NOT THE DETRIMENTAL EFFECT ON THE C.A. FATIGUE LIFE AT R=0.1 HOWEVER, AT R=-1, THE C.A. FATIGUE LIFE IS REDUCED IN THE HIGHER STRESS RANGE. THE PRELIMINARY RESULTS OF SOME TESTS CARRIED OUT WITH THE WISPER LOAD SEQUENCE INDICATE, THAT THE EXPERIMENTAL FATIGUE LIFE IS LARGER THAN PREDICTED BY MINER'S RULE. IN A SIMILAR MANNER THE NLR HAS STARTED NOW CONSTANT AND VARIABLE AMPLITUDE TESTING OF FILAMENT WOUNT GLASSFIBRE/POLYESTER IN COOPERATION WITH RISOE (DK) AND RUG (B). FIRST RESULTS ARE SHOWN ON MATERIAL WITH A +/- 10 DEGREE C. LAY-UP. TESTING WAS DONE AT A R-RATIO R=10. THE AIM OF THE DLR PROJECT IS TO OBTAIN FATIGUE DATA OF GLAS-EPOXY (GI-EP) MATERIAL FOR ROTORBLADES AND TO SHOW THE LIMITS OF THE CERTIFICATION ALLOWABLE. FOR THIS PURPOSE THE PROGRAMME IS CARRIED OUT DOUBLETRACKED. THE TESTS ARE CARRIED OUT ON SMALL SPECIMENS AND ON STRUCTURAL BLADE COMPONENTS. THE FATIGUE BEHAVIOUR UP TO 10/8 LOAD CYCLES IS INVESTIGATED WITH CONSTANT AMPLITUDE. ADDITIONALLY, LOAD SEQUENCE TESTS WITH IEA-STANDARD WISPER WILL TAKE PLACE. THIS INCLUDES TIME INTENSIVE TESTS. THEREFORE, A SIMULTANEOUSLY WORKING TRIPLE CLAMPING DEVICE (TCD) FOR SPECIMENS AND A TRIPLE TESTING RIG (TTR) FOR THREE BLADE COMPONENTS WERE DEVELOPED. THE E - N CURVE FOR THE GI-EP COUPON SPECIMENS HAS A STACKING SEQUENCE OF (+/_ 45 DEGREES C. G1 / 0 DEGREES C. G1,5) SYM AND A STRESS RATIO OF R=-1. AT THE SPAR BEAMS STRAINS, DEFLECTION AND TORSION ARE MONITORED BEFORE AND AFTER DYNAMIC LOADINGS. AS A FURTHER INSPECTION METHOD THE DAMPING BEHAVIOUR IS BEING INVESTIGATED. Champ scientifique engineering and technologyenvironmental engineeringenergy and fuelsrenewable energywind power Programme(s) FP1-ENNONUC 3C - Research and development programme (EEC) in the field of Non-Nuclear Energy, 1985-1988 Thème(s) Data not available Appel à propositions Data not available Régime de financement CSC - Cost-sharing contracts Coordinateur GERMAN AEROSPACE CENTRE Contribution de l’UE Aucune donnée Adresse Linder Höhe 51147 KOELN Allemagne Voir sur la carte Liens Site web Opens in new window Coût total Aucune donnée Participants (3) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire FA Allemagne Contribution de l’UE Aucune donnée Adresse München Voir sur la carte Coût total Aucune donnée NATIONAL AEROSPACE LAB. (NLR) Pays-Bas Contribution de l’UE Aucune donnée Adresse AMSTERDAM Voir sur la carte Coût total Aucune donnée Netherlands Energy Research Foundation Ecn Pays-Bas Contribution de l’UE Aucune donnée Adresse 1755 ZG Petten Voir sur la carte Coût total Aucune donnée