In-Situ Determination of Degree of Cure by Mapping with Strain Measured by Embedded FBG and Conventional Sensor during VIM Process 


Vol. 21,  No. 11, pp. 2614-2624, Nov.  2020
10.1007/s12221-020-1064-5


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  Abstract

Ensuring the desired degree of cure during manufacturing of vacuum infusion molded (VIM) composite laminate is important to optimize the production time and performance. The traditional method of estimating the degree of cure using Differential Scanning Calorimetry (DSC) method cannot be applied during manufacturing. An alternative approach has been explored here by embedding Fiber Bragg grating (FBG) sensor and conventional strain sensor in the composite laminate during manufacturing and mapping the strain developed due to curing with degree of cure. A proper methodology is followed to embed the sensors accurately over glass fiber mats. It is demonstrated that the strain developed during manufacturing indeed indicates different stages of curing cycle. The strain developed can further be mapped with the degree of cure which is estimated 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 which occurs during the curing process. The initial drop in strain before the crosslinking reaction begins can be attributed to the reduction in viscosity which is further confirmed by the Rheometry analysis. It is established that the time when strain starts to progress and attains a constant value coincides with the onset (tgel) and completion of the curing process respectively.

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  Cite this article

[IEEE Style]

S. Mohanta, Y. Padarthi, J. Gupta, S. Neogi, "In-Situ Determination of Degree of Cure by Mapping with Strain Measured by Embedded FBG and Conventional Sensor during VIM Process," Fibers and Polymers, vol. 21, no. 11, pp. 2614-2624, 2020. DOI: 10.1007/s12221-020-1064-5.

[ACM Style]

Santoshi Mohanta, Yashwanth Padarthi, Jeetendra Gupta, and Swati Neogi. 2020. In-Situ Determination of Degree of Cure by Mapping with Strain Measured by Embedded FBG and Conventional Sensor during VIM Process. Fibers and Polymers, 21, 11, (2020), 2614-2624. DOI: 10.1007/s12221-020-1064-5.

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