Black technology 1: "For the last century, finite element must be a heavy black technology of mechanics, and now it has been extended to BVP solutions of physical fields outside mechanics."
Black technology 2: "Leafless wind power and hydropower. Traditional wind-driven hydropower generation relies on fluid to drive blades to rotate, so it is necessary to avoid blade vibration. This bladeless power generation method plays the pipa, which uses vibration to realize large deformation of solid, a typical fluid-solid coupling problem. Draw a sword and cut off the water, wind power generation-rude words-people know that Spanish companies have put forward a new concept of wind power generation, and bladeless paddles use eddy currents to generate electricity. "
Black Technology III: "Fracture Mechanics in High Capacity Lithium Batteries. Let's translate a summary briefly.
The deterioration of mechanical properties of large-capacity electrode materials and the resulting capacity loss hinder its application in high-performance rechargeable batteries. Although the electrochemical-mechanical coupling behavior of large-capacity electrode materials has been studied a lot, its fracture characteristics and mechanism are still unclear. Here, we report a study on the damage resistance of lithium silicon electrochemical nano-mechanics. Through real-time electron microscope experiments, we found the brittle fracture of pure silicon and the tensile deformation of fully lithiated silicon. The quantitative fracture toughness obtained by nano-indentation shows that when the atomic ratio of lithium to silicon reaches 1.5, a rapid brittle-ductile transition occurs. Molecular dynamics simulation shows that this mechanism is toughened by atomic bonds and lithium. Our research results show that amorphous lithium-rich silicon alloy has high destructive resistance, which is of great significance for developing long-life rechargeable batteries. "
Black Technology IV: Extensible electronic devices, stretchable strain sensors and stretchable transparent electrodes can realize macro-large deformation of brittle materials through geometric design (the picture below shows stretchable silicon materials) (the picture below shows A rechargeable battery, B fractal structure brittleness is stretchable large deformation, C spiral structure brittleness is stretchable large deformation, D antenna).
Black Technology V: "In the traditional manufacturing field dominated by machinery, machinery is often an auxiliary industry. This is a sad reminder that you can do it without you. . . Although people who are mechanics find it very useful, leaders and people in other industries may not necessarily recognize it. . . Then, there is some research progress, which is to make some materials "A" through some mechanical phenomena and make nanowires through cracks. B, manufacturing a nano-scale channel through the collapse of the elastomer. C, black technology mentioned above, stretchable 3d silicon structure. D, manufacturing the superhydrophobic material through the folded hierarchical structure of the elastomer. Using the capillary force generated by liquid evaporation to make some interesting structures. Compared with other disciplines, ps and mechanics have the advantage that parameters can be accurately controlled by control equations, and the computer simulation effect is very good, without complicated chemical synthesis, in one step.
—— Excerpted from People's Daily Online