For sensors, it is not difficult to only achieve one of the following critical performances including monitoring multimechanical signals, working under strict environments, being environmentally friendly, low cost, and high...
A flexible pressure sensor based on multicarbon nanotubes (MWCNTs) network-coated porous elastomer sponge is developed with a broad range and robust features for use in wearable applications.
Flexible strain sensors have attracted significant attention in the wearable electronic device field, owing to their exceptional ductility, sensitivity, and durability compared to rigid strain sensors. However, the limited strain detection range or sensitivity has hindered their widespread application. In this study, a flexible strain sensor is fabricated by screenprinting a conductive carbon black ink layer on a conductive flexible composite layer made of thermoplastic polyurethane and multiwalled carbon nanotubes. Both kirigami-patterned and fingerprint-patterned structures are introduced to the architecture of sensors; while the former is designed for the improvement of strain sensing range, the latter serves for the enhancement of sensitivity and interfacial adhesion. It is demonstrated that the sensor achieves high sensitivity with a gauge factor of up to 5705.53 and has a wide strain sensing range from 0 to 150%. Besides, the sensor also shows good durability (6000 stretching−releasing cycles) and a fast response time of ∼220 ms. The excellent sensor performance of the flexible strain sensor suggests promising applications in human−computer interaction, medical health monitoring, and motion capture.
In this study, we investigated the cracking behaviour of MCrAlY-coated superalloys having different interfacial strengths. A cyclic damage-coupled cohesive zone model is proposed to describe the fatigue crack initiation and propagation at the interface between the coating and the substrate. Our results indicate that a high interfacial strength leads to a significant stress concentration owing to the increasing interfacial stiffness. Moreover, high interfacial strength delays interfacial crack propagation but promotes the accumulation of deformation energy in the substrate, which accelerates fatigue crack initiation in the substrate. This work shows two aspects of high interfacial strength and can provide new insights into coating design.
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