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Vacuum assisted resin transfer molding
Vacuum Assisted Resin Transfer Molding (VARTM) or Vacuum Injected Molding (VIM) is a closed mold, out of autoclave (OOA) 〔Autoclave Quality Outside The Autoclave? (). Available: http://www.compositesworld.com/articles/autoclave-quality-outside-the-autoclave.〕 composite manufacturing process. VARTM is a variation of Resin Transfer Molding (RTM) with its distinguishing characteristic being the replacement of the top portion of a mold tool with a vacuum bag and the use of a vacuum to assist in resin flow.〔X. Song, “Vacuum Assisted Resin Transfer Molding (VARTM): Model Development and Verification,” Blacksburg, VA, 2003.〕 The process involves the use of a vacuum to facilitate resin flow into a fiber layup contained within a mold tool covered by a vacuum bag. After the impregnation occurs the composite part is allowed to cure at room temperature with an optional post cure sometimes carried out.
== Process ==
Typically, this process uses a low viscosity (100 to 1000 cP) polyester or vinyl ester resin along with fiberglass fibers to create a composite.〔J. S. Tate, A.T. Akinola, and D. Kabakov. Bio-based Nanocomposites: An Alternative to Traditional Composites. The Journal of Technology Studies. 35(1). 2009. DOI: http://scholar.lib.vt.edu/ejournals/JOTS/v35/v35n1/tate.html#tate2004.〕 Normally the process is capable of producing composites with a fiber volume fraction between 40-50%.〔 The resin to fiber ratio is important for determining the overall strength and performance of the final part, with mechanical strength being most influenced by the type of fiber reinforcement. The type of resin used will primarily determine the corrosion resistance, heat distortion temperature, and surface finish.〔Vacuum Assisted Resin Transfer Molding (VARTM) - What it is, What it is Not, What it Can, and What it Cannot Do (). Available: https://www.rtmcomposites.com/process/vacuum-assisted-resin-transfer-molding-vartm.〕 Resins used in this process must have low viscosities due to the limited pressure differential provided by the vacuum pump. High performance fibers, such as carbon fiber, can also be used. However, their usage is less common and is mainly for the fabrication of high end parts.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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