CARBON FIBER REINFORCED POLYMER PIEZORESISTIVITY PROPERTIES ANALYSIS USING WHEATSTONE BRIDGE CIRCUIT

• Main Author: Alfin Afwan, Ahmad
• Format: Final Project
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/59546
• Institution: Institut Teknologi Bandung

<p align="justify"> Carbon Fiber Reinforced Polymer (CFRP) is a material that combine two materials (fiber and matrix) to obtain superior properties that different with its constituents. Beside the capability of being main load bearing structure, CFRP has positive piezoresistivity properties that can be utilized as a sensor to detect applied strain. The main objective of this study is to investigate the positive piezoresistivity property of CFRP. Wheatstone bridge circuit was used as a method to measure resistance changes in unidirectional and woven CFRP materials under applied strains. The reversibility nature of resistance changes under applied strain and the value of the CFRP material gauge factor was also investigated. <br /> <br /> The research shows that the positive piezoresistivity properties of CFRP materials can be observed with the wheatstone bridge circuit. Resistance value of unidirectional CFRP is 0.0977 ? meanwhile for woven CFRP the resistance value is 0.1654 ? for longitudinal direction and 0.2357 ? for thickness direction. Reversibility with hysteresis of CFRP materials can also be confirmed with the gauge factor of 38.983 at loading conditions and 29.243 at unloading conditions for unidirectional CFRP as well as 32.831 at loading conditions and 22.019 at unloading conditions for woven CFRP. Positive piezoresistivity properties that has been revealed in this research can be utilized for structural health monitoring technology development. <p align="justify">