JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011 - 58

bi-angle NCF
Fabrications

AR2527 out-gassing data
Tab. 4: Dry vs. wet mechanical properties

Tab. 3: Outgassing properties

Tab. 2: Fabrication bagging method and cure cyle

Laminate Physical Properties

Tab. 5: Cured laminate physical properties

Lay-up

Unitape: 8-plies (0deg), face up parallel

Biaxial-NCF: [±12.5]16T

Laminate properties Thickness/ply (mils) Fibre volume (laminate weight loss)

Bagging procedure

Tool/Teflon/non-porous peel ply/prepreg stack/ touch edge bleed/non-porous peel ply/1-ply 7781/Teflon/caul plate/ airweave/vacuum bag. 1A) Apply full vacuum 1B) Apply pressure, at 45 psi. Vent at 22 Psi. 1C) Start heat at 5F/min. Increase temperature to 275F(135°C) and hold for 2 hours. Remove at or below 140F(60°C).

Autoclave cure

AR2527-Unitape vs. AR2527- Biaxial NCF Mechanical Property Comparison
Requirement limits 1% AR 2527laminate Mechanical properties 0.367% Test method Unitape: 34700 (24k)AR2527-190/ 35-24" 0-direction, DRT ASTMD-5766 55.49 ksi

Tab. 6: Standard unitape prepreg vs. biaxial-ncf mechanical properties

Unitape: 34-700 (24k)-AR2527-190/35 7.03 mil/ply 63.55%

Biaxial-NCF: CPLY-BX77.5-150C3-12KHS-AR2527-161/35 5.89 mils/ply 56.18%

Tg (º C), by DMA (storage mod., loss mod., tan delta)

146.29°C, 143.37°C, 152.37°C

NA

Property

Test method

Total mass loss (% TML)

ASTM E595-07

Biaxial-NCF: CPLY-BX77.5150-C3-12KHSAR2527-161/3 5 [±12.5]16T; Dir, DRT 117 ksi

Collected volatile condensable materials (% CVCM) Water vapour regain (% WVR)

Test direction 0.1% 0.003% Open-hole tension, ult. ksi [16-plies (+45/0/45/90)2S], (1.5"X12") Report 0.099% Open-hole compression, ult. ksi [8 plies (+45/0/45/90)S], (1.5"X12") Compression after impact (CAI), 1500 in-lb/insion, ult. ksi [8 plies (+45/0/45/90)S], (1.5"X12") Tensile strength, kpsi ASTMD 3039 Type I ASTMD 3039 Type I ASTMD 695 modified ASTMD 695 modified ASTMD 790 ASTMD 790 ASTMD 2344 ASTMD 2344 ASTMD-6484

ASTM E595-07

58

ASTM E595-07

37.214 ksi

44.1 ksi

AR2527 hot wet properties:

Specimens placed in chamber #2043 for moisture conditioning at 70°C and 85% R.H. for 27 days with 0.76% moisture weight gain.

jec composites magazine / No68 October 2011
Mechanical properties Test method Unitape: 34700 (24k)AR2527-190/ 35-24" 0-direction, DRT Test direction Tensile strength, kpsi ASTMD 3039 Type I 262.62 Tensile modulus, Mpsi ASTMD 3039 Type I 25.256 Compression strength (tabbed), kpsi ASTMD 695 modified 220.97 Compression modulus (straight), Mpsi ASTMD 695 modified 27.7

53.9 ksi

262.62 25.256 220.97

214 16.1 169.148

Unitape: 34700 (24k)AR2527-190/3 5-24" 0-direction, WRT

Tensile mod., Mpsi Compression strength (tabbed), kpsi Compression modulus (straight), Mpsi Flexural strength (3-pt, S/D 40/1), kpsi Flexural modulus (3-pt, S/D 40/1), Mpsi Short beam shear, (4:1), kpsi Short beam shear, (5:1), kpsi

27.7 264.08 16.36 13.32 13.39

16.15 172.38 14.29 14.66 13.33

339.934

21.63

102.66 (edge delamination)

20.21

We are very grateful to Dr. Nettles of the NASA- Marshall Space Centre in Huntsville, Alabama for developing some of the mechanical data stated in this article. n More information: fsami@aldila.com
JEC COMPOSITES MAGAZINE - Issue #68 Special JEC Asia - October 2011

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