+x Abraham George - 8/21/2019 1:21:56 PMSo if I want to make a 3 mm thick plate with E-glass reinforcement...what is the approx no of fibre layers we should use? Our is a research proj on vartm based composites so the plate size is of limited dimensions and there is no mould also.
+x Greybridge - 8/21/2019 3:29:25 PM+x Abraham George - 8/21/2019 1:21:56 PMSo if I want to make a 3 mm thick plate with E-glass reinforcement...what is the approx no of fibre layers we should use? Our is a research proj on vartm based composites so the plate size is of limited dimensions and there is no mould also.The only way to know for sure is to do a few test runs with a known layer count and a consistent lean out pressure. DO NOT leave your infusion under full vac to lean out. Your resin will boil and and your part will be garbage. Pull resin at full vac until it enters the vent tube, then reduce vac to a lean out pressure appropriate to your tests (go slow so air doesn't push back into your part). Without knowing what your end goal is I can't say exactly what the lean out pressure should be but I wouldn't go more than -15hg. That will get you below the condensation point of your resin and reduce your void volumes by half but still be enough vac to evacuate resin and give you some amount of compaction. Which brings me back to the point, the amount of compaction will affect your per layer thickness. There's a few ways to control this but the most accurate is to weigh your layup before and during infusion and evacuate resin until you hit a specific resin/fabric ratio. Once you have control over your r/f you can predict your mm/layer and thus predict your ultimate part thickness.