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8 twenty images on each side of the specimens were analyzed to evaluate void content. 5 Results and Discussion Surface porosity or pitting effect is a frequent concern which often arises in VBO prepreg-processed laminates. This effect is the repercussion of air trapped between prepreg ply in contact with the tool surface. While the effect of surface porosity on mechanical performance is not significant, it is an aesthetic issue that may include costly methods for remedies such as paints, resin-rich surfacing films, and filling gel coats. However, the mechanical properties and overall life cycle of composite parts are deeply dependent on the through-thickness void content. An example of surface porosity and through-thickness void content using a MATLAB code for image processing is shown in Figure 6. (a) Void 100 mm 100 mm (b) The contents for surface porosity and through-thickness void are listed in Table 2. Laminates produced using DVB technique exhibited the lowest manufacturing- induced void content, as shown in Figure 7(a). The lowest content of surface Original Images Processed Images Figure 6: Original and processed images for (a) surface porosity and (b) through-thickness void.PDF Image | Comparison of Single-Vacuum-Bag and Double-Vacuum-Bag Methods
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