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Yang, Jiawei

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Yang

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Jiawei

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Yang, Jiawei
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    Pattern formation in plastic liquid films on elastomers by ratcheting
    (Royal Society of Chemistry (RSC), 2016) Huang, Jiangshui; Yang, Jiawei; Jin, Lihua; Clarke, David; Suo, Zhigang
    Plastic liquids, also known as Bingham liquids, retain their shape when loads are small, but flow when loads exceed a threshold. We discovered that plastic liquid films coated on elastomers develop wavy patterns under cyclic loads. As the number of cycles increases, the wavelength of the patterns remains unchanged, but the amplitude of the patterns increases and then saturates. Because the patterns develop progressively under cyclic loads, we call this phenomenon as “patterning by ratcheting”. We observe the phenomenon in plastic liquids of several kinds, and studied the effects of thickness, the cyclic frequency of the stretch, and the range of the stretch. Finite element simulations show that the ratcheting phenomenon can occur in materials described by a commonly used model of elastic–plastic deformation.
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    Fatigue Fracture of Self-Recovery Hydrogels
    (American Chemical Society (ACS), 2018-02-16) Bai, Ruobing; Yang, Jiawei; Morelle, Xavier; Yang, Canhui; Suo, Zhigang
    Hydrogels of superior mechanical behavior are under intense development for many applications. Some of these hydrogels can recover their stress-stretch curves after many loading cycles. These hydrogels are called self-recovery hydrogels, or even fatigue-free hydrogels. Such a hydrogel typically contains a covalent polymer network, together with some non-covalent, reversible interactions. Here we show that self-recovery hydrogels are still susceptible to fatigue fracture. We study a hydrogel containing both covalently crosslinked polyacrylamide and uncrosslinked polyvinyl alcohol. For a sample without pre-cut crack, the stress-stretch curve recovers after thousands of loading cycles. For a sample with a pre-cut crack, however, the crack extends cycle by cycle. The threshold for fatigue fracture depends on the covalent network, but negligibly on non-covalent interactions. Above the threshold, the non-covalent interactions slow down the extension of the crack under cyclic loads.