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http://dx.doi.org/10.7234/composres.2021.34.2.088

A Study on the Atmospheric Pressure Control of the VARTM Process for Increasing the Fiber Volume Fraction and Reducing Void  

Kwak, Seong-Hun (Technology & Innovation Division, Gyeongbuk Hybrid Technology Institute)
Kim, Tae-Jun (Technology & Innovation Division, Gyeongbuk Hybrid Technology Institute)
Tak, Yun-Hak (Technology & Innovation Division, Gyeongbuk Hybrid Technology Institute)
Kwon, Sung-Il (Defense Engineering Team, Hankuk Fiber Co., Ltd.)
Lee, Jea-Hyun (Defense Engineering Team, Hankuk Fiber Co., Ltd.)
Kim, Sang-Yong (Aerospace Technology Research Institute, Agency for Defense Development)
Lee, Jong-Cheon (Aerospace Technology Research Institute, Agency for Defense Development)
Publication Information
Composites Research / v.34, no.2, 2021 , pp. 88-95 More about this Journal
Abstract
VARTM (Vacuum-assisted resin transfer molding) process is a low-cost process technology and affiliated with OoA (Out of Autoclave). Besides, it has been widely used in various fields. However, because of its lower quality than the autoclave process, it isn't easy to apply the VARTM process to the aerospace industry, which requires high reliability. The main problem of the VARTM process is the loss of mechanical properties due to the low fiber volume fraction and high void content in comparison to the autoclave. Therefore, many researchers have studied to reduce void and increase fiber volume fraction. This study examines whether the method of controlling atmospheric pressure could increase the fiber volume fraction and reduce void during the resin impregnation process. Reliability evaluation was confirmed by compressive strength test, fiber volume fraction analysis, and optical microscopy. As a result, it was confirmed that increasing the atmospheric pressure step by step in the VARTM process of impregnating the preform with resin effectively increases the fiber volume fraction and reduces void.
Keywords
Vacuum assisted resin transfer molding; Out of autoclave; Fiber volume fraction; Void; Atmospheric pressure;
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