Abstract
This literature review examines the application of carbon fibers and their reinforced plastics for Self-Strain-Sensing structures and gives an up-to-date overview of the existing research. First, relevant basic experimental approaches that can be found in the literature are presented and discussed. Next, we propose to cluster the available articles into 5 categories based on specimen size and ranging from experiments on bare carbon fiber via impregnated fiber rovings to carbon fiber laminates. Each category is analyzed individually and the potential differences between them are discussed based on experimental evidence found in the past. The overview shows, that the choice of carbon fiber and the specific experimental setup both significantly influence the piezoresistive properties measured in Self-Strain-Sensing carbon fiber reinforced plastics. Conclusively, based on the conclusions drawn from the literature review, we propose a small number of measurements that have proven to be important for the analysis of Self-Strain-Sensing carbon fiber structures.
Highlights
Self Sensing is generally referred to as a way to monitor some property of a physical object without the necessity to attach an additional discrete sensor to it
Many carbon fibers have a positive gauge factor when being strained. This is especially true for PAN based carbon fibers with low to medium stiffnesses and high strengths (HS type)
Overall,the results show that a linear relationship between strain and electrical resistance is measured for many carbon fibers
Summary
Self Sensing is generally referred to as a way to monitor some property of a physical object without the necessity to attach an additional discrete sensor to it. We discuss experimental works that attempt to measure mechanical strain using Self-Sensing approaches It has been shown in the past that ambient changes in humidity and especially temperature have a significant impact on the measured resistance of carbon fiber based sensors [3,12]. We believe that we can learn a lot from analyzing and comparing results between all of these different types of experiments, finding general principles that occur everywhere and trying to explain the reasons for differences in results To achieve this task, we novelly propose to cluster the existing research into 5 categories of growing part complexity which we believe to be helpful in understanding the functioning principle of a carbon fiber based sensor: J.
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