Stave studies 11/18/2013 - PowerPoint Presentation

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Stave studies 11/18/2013 - PPT Presentation

FrançoisXavier Nuiry Wolfgang Klempt Fernando Duarte Ramos Miguel Angel Villarejo 1 Stave studies 2 Reception of 3 new staves from Composite Design Stave 1 layup T800 skin 3 plies 0 90 0 0095mm thick ID: 797501

t800 stave sandwich nida stave t800 nida sandwich skin full stiffness nomex design staves tpt glue rohacell composite thick

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Slide1

Stave studies

11/18/2013François-Xavier NuiryWolfgang KlemptFernando Duarte RamosMiguel Angel Villarejo

Slide2

Stave studies2

Reception of 3 new staves from Composite Design:



Stave 1 layup:

-T800 skin, 3 plies [0°, 90°, 0°] (~0.095mm thick)

Rohacell

core 51kg/m

(Machined)

-T800 skin, 3 plies [0°, 90°, 0°] (~0.095mm thick)Thickness: ~1.77mm Length: ~280.2mm Width: ~25.85mm Mass: 3.173gStave 2 layup: -T800 skin, 3 plies [0°, 90°, 0°] (~0.095mm thick) -Nida Nomex C2 3.2 29, density 29kg/m3 -T800 skin, 3 plies [0°, 90°, 0°] (~0.095mm thick)Thickness: ~1.68mm Length: ~280.2mm Width: ~ 25.9mm Mass: 3.448gStave 3 (same as stave 2):Thickness: ~ 1.71mm Length: ~280.2mm Width: ~26mm Mass: 3.505g

Slide3

AddendumStave studies3

Composite design staves

Material properties

Glue: DP490 (3M)

150g/m

2.18g / stave!

Should be 3.5-0.32-1.31=

1.87g

Rohacell

core 51kg/m3Masse in one stave~ 0.56gE=70 MPaNida Nomex C2 3.2 29, density 29kg/m3Masse in one stave: ~ 0.32gMP,EX,2,0.0001mp,ey,2,0.0001mp,ez,2,48.26mp,gxy,2,0.00001mp,gyz,2,11mp,gxz,2,15mp,prxy,2,0.5mp,pryz,2,0mp,prxz,2,0 mp,dens,2,0.029E-6T800 skin, 3 plies [0°, 90°, 0°] (~0.095mm thick)Mass for 2 skins ~ (30g/m

2) 1.31gmp,ex,1,161000

mp,ey,1,8600mp,ez,1,8600mp,gxy,1,4870mp,gyz,1,4870mp,gxz,1,4870

mp,prxy,1,0.286

mp,pryz,1,0.3

mp,prxz,1,0.286

!mp,alpx,1,-7.65E-007

!mp,alpy,1,15E-006

!mp,alpz,1,15E-006

mp,dens,1,1.570E-6

Source: ESACOMP

Coming from ESACOMP

Coming from

Composite design

Coming from

rohacell

datasheet

Loading case for transverse shear modulus calculation:

Gxy

Gyz

Glue: DP490 (3M)

150g/m

2.18g / stave!

Should be 3.173-0.56-1.31=

1.3g

Slide4

AddendumStave studies4

Composite design staves

Mass

Stave 1

Stave 2

Stave 3

Skin

T800

1.31g

T800

1.31g

T8001.31gCoreRohacell0.56gNida0.32gNida0.32gGlue1.3g1.87g1.87gTotal mass3.17g3.5g3.5g

Slide5

Composite Design Staves: Full sandwichCalculation of the bending stiffness E*I

Two options:

2- E*I calculated from the beam bow formula

1- E*I calculated from the beam theory

Can be approximated:

Slide6

Composite Design Staves: Full sandwichANSYS Calculation of the flexural stiffness

Composite design staves

Geometry

Full sandwich

Skin Mat

T800 (TPT)

Core Mat

Rohacell

Nida nomex

Span (mm)

180

260

180

260

180

260

180

260

Displacement (mm)

0.6

Core E modulus Mpa

48.26

Core G modulus Mpa

26.92

7.69

15.00

Reaction force in the center (N)

1.619

0.5666

1.2904

0.50132

1.3545

0.48997

1.407

0.509

Flexural stiffness (N/mm)

2.70

0.94

2.15

0.84

2.26

0.82

2.35

0.85

Bending stiffness (EI)

N.mm^2 (Bow formula)

3.66E+05

3.65E+05

3.68E+05

3.65E+05

3.22E+05

3.24E+05

3.36E+05

3.38E+05

Bending

stiffness (EI)

N.mm^2 (beam theory)

3.52E+05

3.16E+05

3.30E+05

MEASURMENTS

Flexural stiffness N/mm

2.12

0.781

2.12

0.781

2.17

0.776

2.24

0.79

Bending stiffness (EI) N.mm^2

3.61E+05

3.37E+05

3.13E+05

3.09E+05

3.24E+05

3.15E+05

Slide7

StavesComparison of the measured flexural stiffness

Stave

Skin

Core

Span (mm)

Flexural stiffness (N/mm)

Masse, g (280mm long stave)

Bending stiffness

N.mm

Natural frequency estimate (Hz)(280mm long stave clamped on both sides)PH/DT cross bracing prototypeStave 8M55JRohacell180 mm1.78 N/mm1.48 g2.39 * 105138 HzPH/DT sandwich prototypeM55JRohacell180 mm6.95 N/mm3.74 g16.3 * 105314 HzCD Stave 1T800

Rohacell180 mm

2.12 N/mm3.173 g

3.61 * 10

152 Hz

CD Stave 2

T800

Nida

Nomex

180 mm

2.17 N/mm

3.448 g

3.13 * 10

140 Hz

CD Stave 3

T800

Nida

Nomex

180 mm

2.24 N/mm

3.505 g

3.24 * 10

142 Hz

Slide8

Short – Mid term strategyDiscussions with Composit Design

Staves manufacturing process:

Nida

Staves

Glue application on skins (150g/m2)

Impregnation of the

nida

on the skin

Re-application of glue (150g/m2) on skinsRealisation of the sandwichCure at room temperature under 0.2BarAlternatives:-Impregnation of nida on a table and impregnation of the skin and then gluing (better control of the glue quantity)-Glue sheets 150g/m2 (~ 110 micron) thick with micro holes (cure at 120C)-CD could also tests other glue films (e.g: Staystick…)-Direct polymerisation of the prepreg on the nida (not so good for Alum nida, but OK for Nomex). Here a specific glue is necessary.What is not possible:Just an impregnation of the nida and direct gluing on skins. It would not stick according to them.For space applications, skins are always polymerised before realising the sandwich.

Rohacell StaveGlue application

on skins (150g/m2)Realisation of the sandwich

Cure at room temperature under 0.2Bar