PSI - Issue 64

Wenkui Dong et al. / Procedia Structural Integrity 64 (2024) 1152–1159 Wenkui Dong and Marco Liebscher et al./ Structural Integrity Procedia 00 (2019) 000 – 000

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Fig. 4. Stress-sensing performance of MCF with two outer electrodes subjected to cyclic flexural stress: (a) SO1; (b) SO2; (c) SO3; (d) SO4.

Fig. 5 displays the stress-sensing performances of four MCF samples with two inner electrodes subjected to cyclic flexural stress, namely SI1, SI2, SI3, and SI4, respectively. Similarly, there is significant fluctuation in the FCR among different samples. Compared to the counterparts with outer electrodes, the FCR values under the same applied load have also increased for the MCF with inner electrodes. For the outer electrodes, electrodes make direct contact with the cross-sectional area of the carbon yarns, which is different from the inner electrodes that make contact with the surface of the outer filament layers of MCF. Therefore, the attaching or detaching of carbon fibres under flexural stress can be more easily captured through the surficial electrodes. However, it can also be observed that the instability has increased compared to the previous MCF with outer electrodes, especially for SI3, which has a significant variation in FCR with poor repeatability.