Fracture-based interfacial breakage has shown promise in efficiently removing ice accretion. Here, intrigued by the response of human skin to stress-induced deformation, we present a strategy to design tough-skin de-icing surfaces (TSDSs) that actively manipulate crack-induced ice-substrate interfacial breakage during ice removal. This design leverages the surface instability of thin films to generate extensive wrinkling at the ice-substrate interface, which serves as crack initiation sites. We demonstrate efficient ice shedding by creating wrinkles at two length scales, macro wrinkles for actively initiate the cracks at the rim of ice and micro wrinkles for further promoting stress concentration at the ice-substrate interface. The TSDS (τ < 10 kPa) displays excellent durability and weather resistance, achieving a large-area ice self-shedding effect solely through gravity. The universality of the proposed mechanism is verified on multiple materials and potential applications. This design concept offers valuable insights into creating durable de-icing materials with enhanced ice-shedding properties.
Tingting Zhang,Jin He,Ning Xu,Wang Yin,Dongli Liu,Chang Liu,Meidong Lang
During the service life of thermoset matrix fiber-reinforced polymer composites, they are susceptible to structural damage such as delamination after low-velocity impacts, thereby affecting their mechanical properties and structural integrity. Therefore, this paper adjusted the properties of polydicyclopentadiene matrix through copolymerization and incorporation of elastomers to obtain modified polydicyclopentadiene/glass fiber composites with improved interlaminar fracture toughness and impact resistance without significantly sacrificing rigidity. The results indicated that compared to polydicyclopentadiene/glass fiber, the G Ⅰ,R increased from 2.61 kJ/m 2 to 4.33 kJ/m 2 and the G ⅡC increased from 3.04 kJ/m 2 to 4.07 kJ/m 2 by incorporating 10 wt% cyclooctadiene and 2 phr styrene-ethylene-butylene-styrene. The energy dissipation mechanisms leading to these improvements included matrix ductile fracture, shear yielding, particle crack bridging, particle fracture, and particle debonding. Additionally, compared to polydicyclopentadiene/glass fiber, the damage area decreased under drop weight impact by incorporating styrene-ethylene-butylene-styrene. Moreover, compared with epoxy/glass fiber composites, modified polydicyclopentadiene/glass fiber composites demonstrated superior interlaminar fracture toughness and impact resistance. The interlaminar fracture toughness of modified polydicyclopentadiene/glass fiber was comparable to that of thermoplastic matrix composites. This study provided a significant method for enhancing the interlaminar toughness and impact resistance of polydicyclopentadiene/glass fiber composites by adjusting the matrix toughness.
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