Integrating
multiple mechanical sensing capabilities in one device
is highly desired to mimic the amazing functions of human skin, and
it demonstrates promising applications in the human–machine
interface and wearable robotic exoskeletons. Yet, challenges remain
in how to couple the multisensations using as few modules as possible
to increase the compactness and conformality of the electronics. Herein,
we report a self-powered multiple mechanical sensing electronic device
capable of sensing multiple motion modes of strain ratios, strain
direction, and pressure. The self-powered property derives from the
triboelectric working mechanism of the sensor. The multiple mechanical
sensing is realized by utilizing an anisotropic crumpled nanofibrous
membrane as the triboelectric layer and ionic conductor as the electrode
layer. For strain ratios and pressure sensing, the output voltages
of the sensor changed with the changes of these external stimulus
with a comparable sensitivity. More importantly, contributed by the
anisotropic structure of the designed crumples, the directional strain
sensing is realized by the anisotropic sensitivity in three stretched
directions.
Flexible hydrogel sensors have attracted significant attention due to their broad applications in soft robots, healthcare monitoring, and electronic skins. However, the development of super-tough hydrogel-based sensors that combine self-healing,...
This article presents a systematically study through experimental and theoretical methods to better understand the mechanism of the geometric deformation produced during selective laser melting (SLM) treatment of the Ti6Al4V blade. Ti6Al4V blade was prepared by SLM. Microstructure, dimensional deviation and residual stress were investigated. The microstructure observation illustrates that the acicular α martensite formed in prior β grain, in addition, the smaller the grain size, the larger the dimensional deviation. The geometric deviation demonstrates that the directions of dimensional deviation at the leading and trailing edges of the blade are opposite to those in the middle. The distribution of dimensional deviation exhibits a parabolic change at the trailing edge of blade. The thermal stresses along the edges are much larger than that of the blade body, which cause the severe deformation of the edges toward the suction side of the blade. This conclusion is further verified by the XRD method. The residual stress distribution measured through X-ray diffraction is consistent with the simulation results.
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