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- 저자 : Santoshi Mohanta (검색결과 1 건)
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Santoshi Mohanta,Yashwanth Padarthi,Jeetendra Gupta,Swati Neogi 한국섬유공학회 2020 Fibers and polymers Vol.21 No.11
Ensuring the desired degree of cure during manufacturing of vacuum infusion molded (VIM) composite laminateis important to optimize the production time and performance. The traditional method of estimating the degree of cure usingDifferential Scanning Calorimetry (DSC) method cannot be applied during manufacturing. An alternative approach has beenexplored here by embedding Fiber Bragg grating (FBG) sensor and conventional strain sensor in the composite laminateduring manufacturing and mapping the strain developed due to curing with degree of cure. A proper methodology is followedto embed the sensors accurately over glass fiber mats. It is demonstrated that the strain developed during manufacturingindeed indicates different stages of curing cycle. The strain developed can further be mapped with the degree of cure which isestimated by performing a curing experiment using DSC under identical cure conditions as maintained during manufacturing. Thermal Mechanical Analysis (TMA) is also performed to confirm the fact that strain is generated due to shrinkage whichoccurs during the curing process. The initial drop in strain before the crosslinking reaction begins can be attributed to thereduction in viscosity which is further confirmed by the Rheometry analysis. It is established that the time when strain startsto progress and attains a constant value coincides with the onset (tgel) and completion of the curing process respectively.
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