The Material Chosen Methods Base on AUTODYN Dynamic for Substrate Film of Flexible Film Sensor Circuit

In the process of ammunition test & evaluation, to accurately evaluate the lethality of personnel targets on the battlefield, it is necessary to accurately measure the velocity and coordinates of ammunition fragments. At present, the most effective method for measuring the projectile velocity and the midpoint coordinates of ammunition is to use the measuring circuit printed with silver paste on the flexible substrate material. Considering that the physical properties of the substrate material will greatly affect the velocity attenuation value of the fragments and the size of the hole at the hitting position, this article mainly uses the AUTODYN software to simulate the process of the projectile penetrating three kinds of polymer materials and copper circuit which are used in many universities and test ground and selects the suitable polymer material that has the least negative effects on the velocity of the projectile, The speed measurement accuracy of the flexible silver paste printing film sensors circuit printed on three different polymer substrate materials is compared by the live-fire test method, which verifies the effectiveness of the simulation calculation process and proves that the polycarbonate (PC) material is the most suitable substrate material for the silver paste printed circuit among the Polyimide (PI), Polycarbonate (PC), and Polyethylene terephthalate (PET) polymer materials which are the most common and cheapest one in market

Growth Control of MoS₂ Nanosheets on Carbon Cloth for Maximum Active Edges Exposed: An Excellent Hydrogen Evolution 3D Cathode

To greatly improve the hydrogen evolution reaction (HER) performance, it is the key approach to expose as many active edges of MoS₂ as possible. This target is the research hotspot and difficulty of MoS₂ which is a promising HER catalyst. In this work, we realized the active-edges control of MoS₂ nanosheets on carbon cloth (CC) by growth control during the synthesis procedure. Moreover, MoS₂ nanosheets vertically grown on carbon cloth (MoS₂⊥CC) was confirmed to be the best morphology with maximum active edges exposed. Multifactors structure control resulted in abundant active-edges exposure and effective electron delivery, thus excellent HER activity. This three-dimensional cathode, MoS₂⊥CC, can reach a great current density of 200 mA/cm² at a small overpotential of 205 mV. The preeminent HER performance can rival the best MoS₂-based catalyst ever reported