Stave studies 6152013 FranoisXavier Nuiry Wolfgang Klempt Fernando

Stave studies 6/15/2013 François-Xavier Nuiry Wolfgang Klempt Fernando Duarte Ramos Miguel Angel Villarejo 1

Overview • Composite Design Stave prototypes http: //www. compositedesign. ch/introduction. FR. html 2

Stave studies Reception of 3 new staves from Composite Design: Stave 1 layup: -T 800 skin, 3 plies [0°, 90°, 0°] (~0. 095 mm thick) -Rohacell core 51 kg/m 3 (Machined) -T 800 skin, 3 plies [0°, 90°, 0°] (~0. 095 mm thick) Thickness: ~1. 77 mm Length: ~280. 2 mm Width: ~25. 85 mm Mass: 3. 173 g Stave 2 layup: -T 800 skin, 3 plies [0°, 90°, 0°] (~0. 095 mm thick) -Nida Nomex C 2 3. 2 29, density 29 kg/m 3 -T 800 skin, 3 plies [0°, 90°, 0°] (~0. 095 mm thick) Thickness: ~1. 68 mm Length: ~280. 2 mm Width: ~ 25. 9 mm Mass: 3. 448 g Stave 3 (same as stave 2): Thickness: ~ 1. 71 mm Width: ~26 mm Mass: 3. 505 g Length: ~280. 2 mm 3

Stave studies Next steps Composite design staves Material properties T 800 skin, 3 plies [0°, 90°, 0°] (~0. 095 mm thick) Deduced mass for 2 skins ~ 3. 173 -0. 56=2. 61 g mp, ex, 1, 161000 mp, ey, 1, 8600 mp, ez, 1, 8600 mp, gxy, 1, 4870 mp, gyz, 1, 4870 mp, gxz, 1, 4870 Source: ESACOMP mp, prxy, 1, 0. 286 mp, pryz, 1, 0. 3 mp, prxz, 1, 0. 286 !mp, alpx, 1, -7. 65 E-007 !mp, alpy, 1, 15 E-006 !mp, alpz, 1, 15 E-006 mp, dens, 1, 1. 570 E-6 Rohacell core 51 kg/m 3 Masse in one stave~ 0. 56 g E=70 MPa Coming from rohacell datasheet Nida Nomex C 2 3. 2 29, density 29 kg/m 3 Loading case for transverse shear modulus calculation: Gxy Gyz Glue: DP 490 (3 M) 150 g/m 2 2. 18 g / stave! Should be 3. 5 -0. 32 -2. 61= 0. 57 g Masse in one stave: ~ 0. 32 g MP, EX, 2, 0. 0001 mp, ey, 2, 0. 0001 Coming from ESACOMP mp, ez, 2, 48. 26 mp, gxy, 2, 0. 00001 mp, gyz, 2, 11 mp, gxz, 2, 15 mp, prxy, 2, 0. 5 Coming from mp, pryz, 2, 0 Composite design mp, prxz, 2, 0 mp, dens, 2, 0. 029 E-6 4

Stave Measure and calculation of the bending stiffness Test performed: 3 points bending test Standard used: ASTM D 790 -02 Configuration: Loading nose and supports radius: 5 mm Support span : 180 mm and 260 mm Loading nose speed: 30, and 62. 6 mm/min Test stopped when 1. 5 N are reached Test to be cross-checked with the EN-MME Lab (Mr. Kurt Artoos). 5

Composite Design Staves: Full sandwich Measure of the flexural stiffness FEM simulations: (Total thickness = 1. 85 mm) 3 points bending test Bow due to both longitudinal elastic modulus (Equivalent) and transversal shear modulus (Rohacell) Analytical calculation Stiffness=8. 7 N/mm For a 160 mm span Composite design staves 1 Span (mm) Flexural stiffness N/mm Bending stiffness (EI) N. mm^2 2 3 Full sandwich Full sandwich T 800 (TPT) T 800 (TPT) Rohacell Nida nomex 180 260 2, 12 0, 781 2. 79 E+05 2. 98 E+05 2, 17 0, 776 2, 24 0, 790 6

Composite Design Staves: Full sandwich Calculation of the flexural stiffness Composite design staves 1 2 3 Geometry Full sandwich Full sandwich Skin Mat T 800 (TPT) T 800 (TPT) Core Mat Rohacell Nida nomex BC UX=0 on one support yes yes yes Lesize 0, 6 0, 6 Stave width (mm) 25, 85 25, 9 26 26 Skin thickness (mm) 0, 09 0, 09 Core thickness (mm) 1, 59 1, 53 Span (mm) 180 260 Displacement (mm) 0, 6 0, 6 Core E modulus Mpa 70 70 48, 26 Core G modulus Mpa Reaction force in the center (N) Flexural stiffness (N/mm) Bending stiffness (EI) N. mm^2 26, 92 1, 619 0, 5666 1, 3545 0, 48997 1, 407 0, 509 2, 70 0, 94 2, 26 0, 82 2, 35 0, 85 3, 64 E+05 7

Composite Design Staves: Full sandwich Calculation of the flexural stiffness 3 Stave flexural stiffness vs span (Rohacell core) Flexural stiffness (N/mm) 2. 5 2 Measured Flexural stiffness (N/mm) 1. 5 Calculated Flexural stiffness (N/mm) (Er=70 MPa) Calculated Flexural stiffness (N/mm) (Er=20 MPa) 1 0. 5 0 150 170 190 210 230 Span (mm) 250 270 290 8

Composite Design Staves: Full sandwich Calculation of the flexural stiffness 2. 5 Stave flexural stiffness vs span (Nida core) Flexural stiffness (N/mm) 2 1. 5 Measured Flexural stiffness (N/mm) Calculated Flexural stiffness (N/mm) (En=48. 26 MPa) 1 0. 5 0 150 170 190 210 230 Span (mm) 250 270 290 9

Staves Comparison of the measured flexural stiffness Stave Skin Core Flexural stiffness (N/mm) Masse, g (280 mm long stave) Bending stiffness N. mm 2 Natural frequency estimate (Hz) (280 mm long stave clamped on both sides) M 55 J Rohacell 180 mm 1. 78 N/mm 1. 48 g 2. 39 * 105 138 Hz PH/DT sandwich prototype M 55 J Rohacell 180 mm 6. 95 N/mm 3. 74 g 16. 3 * 105 314 Hz CD Stave 1 T 800 Rohacell 180 mm 2. 12 N/mm 3. 173 g 2. 79 * 105 134 Hz CD Stave 2 T 800 Nida Nomex 180 mm 2. 17 N/mm 3. 448 g tbd CD Stave 3 T 800 Nida Nomex 180 mm 2. 24 N/mm 3. 505 g tbd PH/DT cross bracing prototype Stave 8 Span (mm) 10

Staves Nida modelisation 11

Short – Mid term strategy Discussions Staves: next steps: Going on calculation / measurement comparisons: -Stave flexural and torsional measurements with Mr. Kurt Artoos? -Study of new designs (filament winding, C-Si foams…) -Order of different prepregs 12