The low-density PZT-95/5 ceramic hydrostatic phase transition stress distribution is very different from the solid sphere. At the hole wall, ie, at r=a, there is =, and printing = a 3pb/2, and the stress value is significantly increased. The shear effect of the pore edge makes the shear stress concentrated region appear in the ceramic, which is conducive to the occurrence of shear-type phase transition. Inside the ceramic, due to the uneven distribution of stress, some regions undergo earlier phase changes under lower average stress. When phase change occurs in these regions, the unit volume and surface free energy will change, causing the mechanical state of adjacent regions to also change. If this change reaches a level sufficient for phase transition, the surrounding region will also undergo phase change. Due to the discontinuity of this change, the overall phase transition appears to be in a diffuse state, so phase transitions occur in a wide range of stress. Of course, the inconsistency of the collapse of the stomata and the level of shear can also cause a phase change dispersion. It can be seen that the energy release efficiency of the phase transition of low-density ceramics has declined, and there are two explanations for this phenomenon. One explanation is that according to theoretical analysis, the piezoelectric constant d33 and the surface charge density P. of the PZT-95/5 material have the following relationship, but the surface charge density varies greatly. Another explanation is that when the air vent collapses, the internal leakage of the material increases, causing some of the charge to be neutralized inside the material. The United States Sandia laboratory recently also has similar findings. 5 Conclusions From the above experiments and analyses, it is not difficult to draw the following conclusion: The existence of stomata has a significant effect on the static pressure phase transition of PZT-95/5 materials, which can be qualitatively determined by the assumption of collapse of pores or the assumption of edge shear. Explanation; (2) The collapse of stomata is closely related to the surrounding medium strength. The strength of the medium surrounding the pores can be determined by the pore morphology and the size of the solid crystals. Therefore, the static pressure transition characteristics of the PZT-95/5 material can be improved by material technology. Because of the different dynamic pressure and static pressure loading conditions, the energy release law under dynamic pressure will be different under static pressure. Dynamic pressure experiments may find more advantages of low-density materials in the field of phase change research. This may be the reason why Sandy's lab uses lower-density ceramics as phase-change energy materials. Here you can find the related products in Ultrasonic Flow Meter, we are professional manufacturer of Ultrasonic Flow Meter,Portable Flow Meter,Portable Ultrasonic Flow Meter,Ultrasonic Flow Measurement. We focused on international export product development, production and sales. We have improved quality control processes of Ultrasonic Flow Meter to ensure each export qualified product. Ultrasonic Flow Meter,Portable Flow Meter,Portable Ultrasonic Flow Meter,Ultrasonic Flow Measurement Xi'an Gavin Electronic Technology Co., Ltd , https://www.gaimcmea.com
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