Assessment reveals how different curing states influence bonding strength in NiTi-SMA wire, suggesting improved adhesive choices.
Epoxy resin is a key component of force transmission in Shape Memory Alloy/Fiber Reinforced Polymer composites (SMA/FRP composites). Epoxy resins of different curing types have different applicability in engineering applications. Through shape memory alloy (SMA) wire pull-out test, the influence of epoxy resins with different initial curing states on the interfacial bonding properties of nickel-titanium shape memory alloy (NiTi-SMA) wire/epoxy adhesive was studied, and the influence of initial curing state on the failure mode, ultimate debonding load and load-displacement relationship of SMA wire/epoxy resin interface was analyzed. The results show that the failure modes of solid Lica-102 carbon fabric adhesive and liquid carbon impregnation adhesive are both brittle failure of NiTi-SMA wire/epoxy resin interface adhesive layer. The bonding performance of liquid carbon impregnation adhesive is better than that of solid Lica-102 carbon fabric adhesive, and the interfacial bonding strength is 15% higher. Different initial curing states have a significant effect on the interfacial bonding properties of NiTi-SMA wire/epoxy resin. This study provides theoretical support for the optimal design and engineering application of NiTi-SMA/FRP composites, and improves their reliability and performance in different engineering scenarios.
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Qiu et al. (2025) studied this question.
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