Issue 33

R. Sepe et alii, Frattura ed Integrità Strutturale, 33 (2015) 451-462; DOI: 10.3221/IGF-ESIS.33.50 455 Figure 5 : Position of sheets and PCM pipes in the roof. Materials The structure of the roof is mainly made of five different materials. • Sections ("C" or "double T"), made in Al 6061 T6 aluminium alloy; • Sheets, made in Al 2024 T3 aluminium alloy; • Plates, made in Al 7075-T651 aluminium alloy; • Elements of constraint (hinges and pendulums), made in Al 2024 T351 aluminium alloy; • Connection panel sides, made of fiberglass. The mechanical properties of metallic materials are listed in Tab. 2. Material Density [kg/m 3 ] E [MPa]  σ y (R 0.2%) [MPa] σ u [MPa] Al 6061 T6 2700 70000 0.33 240 260 Al 2024 T3 2700 70000 0.33 290 435 Al 7075 T651 2700 70000 0.33 360 400 Al 2024 T351 2700 70000 0.33 290 440 Fiberglass 1600 35000 0.33 40 60 Table 2 : Mechanical properties of materials. In Tab. 3 are reported the masses of structure, PCM pipes and insulating panels. Component Mass [kg] Plates and frames 36 Sheets 94 Pipes 270 PCM 440 Insulating panels 85 Table 3 : Mass of the components of the roof module.