Standard, DNVGL-ST-0376 – Edition December 2015 Page 5
DNV GL AS
Contents
2.6.2 Intermediate level test results as design values in structural
verification..................................................................................35
2.6.3 Intermediate level testing for supplementing full scale blade testing ... 36
2.6.4 Requirements for test specimens ...................................................36
2.6.5 Test loads and boundary conditions ................................................37
2.6.6 Accompanying analyses ................................................................37
Sec.3 Materials ..................................................................................................... 38
3.1 General.................................................................................................38
3.2 Specifications and qualification requirements ......................................38
3.2.1 Material specifications and qualification requirements........................38
3.2.2 Generic manufacturing process description ......................................39
3.3 Material requirements ..........................................................................39
3.3.1 General ......................................................................................39
3.3.2 Fibre reinforcements ....................................................................39
3.3.3 Resin matrices.............................................................................40
3.3.4 Pre-impregnated semi-finished products .........................................40
3.3.5 Fibre-reinforced plastic (FRP) laminates ..........................................40
3.3.6 Sandwich core materials and sandwich constructions ........................41
3.3.7 Adhesives ...................................................................................42
3.3.8 Surface finish materials and sealants ..............................................42
3.3.9 Metals ........................................................................................43
3.3.10 Resistance of structural materials against environmental influences ....43
3.4 Material qualification and testing .........................................................43
3.4.1 General ......................................................................................43
3.4.2 Resin matrices.............................................................................44
3.4.3 Fibre-reinforced plastic (FRP) laminate testing .................................44
3.4.4 Sandwich testing .........................................................................46
3.4.5 Adhesive joints testing..................................................................46
3.4.6 Surface finish materials and sealants ..............................................47
3.5 Design values .......................................................................................47
3.5.1 Derivation of characteristic material values......................................47
3.5.2 Normalization with regard to fibre volume content............................48
3.5.3 Fatigue tests ...............................................................................49
3.5.4 Design values derived from testing.................................................49
3.5.5 Simplified design values................................................................50
3.5.6 Influence of manufacturing effects .................................................50
3.6 Material requirements for manufacturing .............................................51
Sec.4 Full scale blade testing................................................................................ 52
4.1 General.................................................................................................52
4.2 Test blade requirements.......................................................................52
4.2.1 General ......................................................................................52
4.2.2 Test blade manufacturing..............................................................52
4.2.3 Damage and repairs .....................................................................53
4.2.4 Variations in materials, design, or manufacturing methods of
the blade ....................................................................................53
4.3 Blade test specification requirements ..................................................54
4.4 Test laboratory requirements and test witnessing ...............................55
4.5 Test sequence ......................................................................................56
4.6 Areas to be tested ................................................................................56
4.7 Mass properties measurement .............................................................57
4.8 Modal tests...........................................................................................57
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