Issue 29

M. Romano et alii, Frattura ed Integrità Strutturale, 29 (2014) 385-398; DOI: 10.3221/IGF-ESIS.29.34 389 -0.5 0 0.5 1 1.5 2 -50 0 50 100 150 200 0 60 120 180 240 300 360 420 480 540 600 Autoclavpressure and vacuum in bar (relativ) Temperature in °C Time in min Temperature in °C Temperature in °C Autoclavpressure in bar Vacuum in bar Figure 1 : Left: Scheme of the layup used in the processing: 1 sealant tape, 2 vacuum connector, 3 release film, 4 peel ply, 5 composite layup, 6 peel ply, 7 perforated foil, 8 bleeder, 9 vacuum bag. Right: Autoclave curing cycle for test panel processing in terms of temperature T in °C, relative pressure p in bar, and relative vacuum in bar over the process time t in min. approx. 210 150 100 approx. 160 Determination of fiber volume content Test panel Specimen Figure 2 : Schematic cutting lines for test panels and fibre volume content specimens (left) and exemplary specimens for basalt fibre reinforced material before and after the thermal treatment according to DIN EN ISO 1172 [15], [23] (right). Type of test panel Stacking sequence Number of Layers Carbon   C 18 0 / 90 18 Glass   G 18 0 / 90 18 Basalt   B 18 0 / 90 18 C+G+B       C G B 4 4 8 0 / 90 / 0 / 90 / 0 / 90     16 C+G+Hex+B           C G B B 4 4 4 1 4 0 / 90 / 0 / 90 / 0 / 90 / Hex / 0 / 90     16+1 Table 2 : Labeling, stacking sequences and number of layers of the test panels.