#2Chao Chen(UMass: University of Massachusetts Amherst)
Last. Quanshui Zheng(THU: Tsinghua University)H-Index: 50
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Abstract null null The intrinsic contact angle is an essential wetting parameter between a liquid and a substrate and had long been regarded as an intrinsic interfacial property. Recent investigations showed that the intrinsic contact angles depend on substrate curvatures. However, the reported trends were contradictory, and the underlying physics has not been revealed. This paper presents a molecular perspective to understand the intrinsic nature of the curvature effect on the contact angles. M...
#1Zhuohui Zeng(HKUST: Hong Kong University of Science and Technology)H-Index: 2
#2Hongyu Yu(HKUST: Hong Kong University of Science and Technology)H-Index: 25
Last. Xian Chen(HKUST: Hong Kong University of Science and Technology)H-Index: 10
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Abstract null null Buckling of rigid thin films on elastomer substrates underlies the fabrication foundation of stretchable soft electronics. Here we demonstrate an optical approach to in situ characterize the buckling of silicon microribbon driven by releasing the pre-stretched poly-dimethylsiloxane (PDMS) substrate at a controllable strain rate. The method, based on quantitative differential interference microscopy, directly captures the space–time evolution of the surface topography at a fram...
Last. Shaobao Liu(NUAA: Nanjing University of Aeronautics and Astronautics)H-Index: 11
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Abstract null null Selective sensation of sound by the plant Arabidopsis thaliana may enable the timely upregulation of defensive compounds to protect against caterpillars of the plant’s primary insect herbivore. Vibration of leaf trichomes has been shown to occur over frequency ranges that are appropriate for responding to these caterpillars, but the distribution of trichome shapes and sizes over a leaf means that a range of sounds could possibly be transduced. To assess how the diversity of tr...
Abstract Cuff-based blood pressure measurement is the gold standard method for blood pressure monitoring. However, the wall of the sclerotic arteries (stiffen or thicken) generates extra resistance to the cuff pressure in the cuff-based blood pressure measurement, which tends to overestimate the blood pressure. This paper uses a collapse model to study the arterial deformation under the cuff pressure in the cuff-based blood pressure measurement, which gives the effects of arterial stiffness on m...
Abstract null null Due to lack of either translational or rotational symmetries at atomic-scale, predicting properties of amorphous materials from static structure is a challenging task. To circumvent the dilemma, a supervised machine-learning strategy via neural network is proposed to predict the atomic stiffness of metallic glass from discretized radial distribution function. The predicted stiffness and its spatial nature are calibrated with molecular dynamics simulations. After which, the ori...
#1Qiang Zhang(Georgia Institute of Technology)H-Index: 195
#2Shayuan Weng(Georgia Institute of Technology)H-Index: 4
Last. H. Jerry Qi(Georgia Institute of Technology)H-Index: 58
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Abstract null null Due to its high printing resolution and fast printing speed, digital light processing (DLP) has become one of the most widely used additive manufacturing technologies. In a typical DLP printing, resin is photocured from liquid into solid accompanied by a large volume shrinkage, which often leads to shape distortion of printed structures. In this study, we investigated the volume shrinkage-induced distortion of DLP-printed parts by conducting experiments, theoretical modeling, ...
Abstract null null We present an experimental study on mixed-mode crack propagation in thin sheet specimens of a soft silicone elastomer. To introduce mixed-mode loading, we adopted the widely applied pure shear fracture testing geometry, but oriented the initial crack at an inclined angle relative to the direction perpendicular to the external tensile loading. Because of the inclined angle, locally the crack tip was subjected to both tensile and shear loading even though the global loading was ...
Abstract null null Two-dimensional tessellations of alternating high-aspect ratio voids, such as ellipses, are known to induce auxetic behavior in engineering materials. An undesirable side effect of using high-aspect ratio shapes is an increased stress concentration at the ends of the voids. A novel rational process for designing auxetic tessellations with reduced stress concentration using Gielis’ Superformula and Nelder–Mead optimization is presented in this work. Results lead to an end-shape...
#1Shaoting Lin(MIT: Massachusetts Institute of Technology)H-Index: 22
#2Jiahua Ni(MIT: Massachusetts Institute of Technology)H-Index: 1
Last. Xuanhe Zhao(MIT: Massachusetts Institute of Technology)H-Index: 75
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Abstract null null Soft materials have enabled diverse modern technologies, but their practical deployment is usually limited by their mechanical failures. Fracture and fatigue of polymer networks are two important causes of mechanical failures of soft materials. A soft material fails by fracture when a monotonic load reaches its fracture toughness or fails by fatigue when a cyclic load reaches its fatigue threshold. The fracture toughness is usually much higher than the fatigue threshold for ra...
Last. Theodoro A. Netto(UFRJ: Federal University of Rio de Janeiro)H-Index: 16
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Abstract null null Buckle propagation in offshore pipelines is a catastrophic mode of failure critical to the design and operation of such structures. The collapse of a locally weakened section in the pipeline can initiate a buckle that travels at high velocity, flattening long sections of the structure. The propagating buckle velocity increases with the ambient pressure and, as the collapse pressure of the pipe is approached, propagation switches to the flip-flop mode — first reported in Kyriak...