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The cross section photomicrographs of the resultant laminates are shown in Figure 6. High void contents were observed for the SVB molded laminate (Figure 6(a)). The resin-rich domains between fiber tows are particularly high in void content when compared to those domains within the tows. Apparently, the oven single-vacuum-bag process is again ineffective and creates problems in avoiding volatile entrapments in the final consolidated laminate parts. Photomicrograph of the resultant laminate fabricated by the DVB process in Figure 6(b) shows a greatly improved quality part. These results are preliminary so optimized processing conditions are expected to improve part quality further. Mechanical properties of both composite systems will be reported in future publications. (a) SVB molded laminate (20X) (b) DVB molded laminate (20X) Figure 6. Optical photomicrographs of SVB and DVB molded 7781 E-glass/Cycom‚ 6070 phenolic composites. 5. Conclusions Volatile management is a common and critical issue in the manufacturing of many high performance/temperature resistant resin matrix composites. Many classes of industrially importantPDF Image | Evaluation of Double-Vacuum-Bag Process For Composite Fabrication
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