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Sensors 2015, 15(4), 7499-7511; doi:10.3390/s150407499

Embedding Piezoresistive Pressure Sensors to Obtain Online Pressure Profiles Inside Fiber Composite Laminates

1
Institute for Microsensors, Actuators and Systems (IMSAS), University of Bremen, Otto-Hahn-Allee, NW1, 28359 Bremen, Germany
2
Faserinstitut Bremen e.V. (FIBRE), Gebäude IW3, Am Biologischen Garten 2, 28359 Bremen, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M.N. Passaro
Received: 26 November 2014 / Revised: 19 March 2015 / Accepted: 23 March 2015 / Published: 27 March 2015
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [2397 KB, uploaded 27 March 2015]   |  

Abstract

The production of large and complex parts using fiber composite materials is costly due to the frequent formation of voids, porosity and waste products. By embedding different types of sensors and monitoring the process in real time, the amount of wastage can be significantly reduced. This work focuses on developing a knowledge-based method to improve and ensure complete impregnation of the fibers before initiation of the resin cure. Piezoresistive and capacitive pressure sensors were embedded in fiber composite laminates to measure the real-time the pressure values inside the laminate. A change of pressure indicates resin infusion. The sensors were placed in the laminate and the resin was infused by vacuum. The embedded piezoresistive pressure sensors were able to track the vacuum pressure in the fiber composite laminate setup, as well as the arrival of the resin at the sensor. The pressure increase due to closing the resin inlet was also measured. In contrast, the capacitive type of sensor was found to be inappropriate for measuring these quantities. The following study demonstrates real-time monitoring of pressure changes inside the fiber composite laminate, which validate the use of Darcy’s law in porous media to control the resin flow during infusion. View Full-Text
Keywords: embedding; piezoresistive/capacitive pressure sensor; real-time pressure measurement; fiber composite laminate; infusion embedding; piezoresistive/capacitive pressure sensor; real-time pressure measurement; fiber composite laminate; infusion
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Moghaddam, M.K.; Breede, A.; Brauner, C.; Lang, W. Embedding Piezoresistive Pressure Sensors to Obtain Online Pressure Profiles Inside Fiber Composite Laminates. Sensors 2015, 15, 7499-7511.

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