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Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 2 Requirements from Design Resin System Main mechanical properties: E:3200MPa G:1203MPa αt: /K Others properties Typical Maximum Moisture on composite Mm = 1% at 53%RH T= 20°C, It correspond to Mm=6.5% of resin at RH=100%, in our composite actually we have 0.2% Mm. ad 53%RH Moisture expansion coefficient: for T700/with resin, Layup 0/90 Moisture expansion coefficient: for HM65/with resin, Layup 0/90 Diffusivity D=1.335e-8 at T=273K Diffusivity D=3.330e-9 at T=293K The resin system must by UV stable.
Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 3 Fibres Toray T700 Number of filaments:12000 Tensile Strength:4900 MPa Tensile Modulus:230 GPa Elongation:2.1 % CTE: /K Mass per unit Length:800 (g/1000m) Density:1.80 g/cm3 Electric Resistivity:1,7 13-3Ω.cm Thermal conductivity:20 W7mK Mitshubishi K63712 (HM65) Number of filaments:12000 Tensile Strength:2600 MPa Tensile Modulus:640 GPa Elongation:0.4 % CTE: /K Mass per unit Length:2000 (g/1000m) Density:2.12 g/cm3 Electric Resistivity: Ω.cm Thermal conductivity:140 W/mK
Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 4 Honeycomb materials The sandwich core is a standard aluminium alloy honeycomb. The honeycomb is anodised for corrosion protection and Glass fibre will be used as interface layer beetween CFRP an honeycomb. The cells are vented in order to achieve a uniform atmosphere within the sandwich. For adhesive bonding of the facing and the core an epoxy resin is used. Hexcel Alumunim honeycomb CR-PAA-3/ Material AA5052 Density49,66 kg/m3 Young Modulus70 GPa CTE: /K Thermal conductivity:150 W/mK
Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 5 General Prepreg Properties FABRIC T700 : 12K–2x2T Resin TBD Fibre TORAY T700S 12K 40% of resin (mass) Mass 285 g/m² (dry fiber) Width 1 m (TBC with supplier) E1:59GPa E2:59GPa G12:3,200GPa αt1:4.6*10-61/K αt2:4.6*10-61/K UD : HM K Fibre MITSUBISHI K63712 Resin TBD 31% of resin Mass 312 g/m² Widht 0,6 m (TBC with supplier) E1av:335GPa E2:5.6GPa G12:3.200MPa αt1:-0.85*10-6 1/K αt2:26*10-61/K UD T700 : Resin TBD Fibre TORAY T700S 12K 36% of resin Mass 325 g/m² (dry fiber) Width 1 m (TBC with supplier) E1: GPa E2:8,7GPa G12:3,20 GPa αt1:0,38*e-61/K αt2:38*e-61/K
Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 6 General Layup In the specific dravings will be drowned the lamination direction and the layup type. Surface Film properties The surface film must be compatible with the resin system for 30 years time life. It must offer a good UV protection and must be compatible with a direct application of polyurethane paint.
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Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 19 ► Backup stucture
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Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 50 Technical and Design Topics: Hexapod System (2 of 2)- SOL.C
Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 51 Technical and Design Topics: Hexapod System - SOL.B
Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 52 Baseline Planning T0 - Signature of the contract. T1 - Very preliminary froze design (including only a scheme for mechanical design, a diagram for control and a description): T0 + 3 weeks. T2 - PDR: T0 + 6 weeks. T3 - PPDR: T2 + 4 weeks. T4 - Prototype: T weeks (assuming a prototype not fully representative of the production antenna but with some hardware changes to the existing prototype). T5 - First production antenna: End of July 2007 (is it affected with respect to the tests on the prototype)