Publications by authors named "P M Ming"
Electrochemical Mill Grinding of (TiB+TiC)/Ti6Al4V Composites Using Abrasive Tool with Bottom Outlet Holes.
Micromachines (Basel)
November 2024
Difficult-to-cut titanium matrix composites (TMCs) are widely used in the aerospace, automotive, and defense sectors due to their excellent physical properties. Electrochemical mill grinding (ECMG) can achieve the processing effects of electrochemical milling and electrochemical grinding using the same tool, which has the potential to complete the rough and finish machining of TMCs in succession. However, in the rough machining stage, the bottom of the slot becomes concave due to the inevitable stray corrosion, leading to poor flatness, which increases the machining allowance for subsequent finish machining.
View Article and Find Full Text PDFProton exchange membranes (PEMs) are dominated by semicrystalline structures because highly pure crystals are still challenging to produce and control. Currently, the development and application of PEMs have been hindered by a lack of understanding regarding the effects of microstructure on proton and heat transport properties. Based on an experimentally characterized perfluoro sulfonic acid membrane, the corresponding semicrystalline model and the crystal model contained therein were constructed.
View Article and Find Full Text PDFResearch on similarity law of the flow-induced noise of the submarine.
J Acoust Soc Am
December 2024
Article Synopsis
- Flow-induced noise affects submarines' stealth, and understanding it for full-scale models has been challenging despite previous studies on smaller versions.
- The research team used simulations and advanced models to analyze flow noise, considering factors like Mach and Reynolds numbers, and developed a formula to establish a similarity law for sound production in submarines.
- Key findings include the minimal effect of attachments on noise similarity, the relationship of noise frequency to the Helmholtz number, and the ability to estimate full-scale flow noise based on small-scale models using the new similarity law.
Jet electrochemical micromilling (JEMM) exhibits significant potential for high-efficiency and high-quality machining of titanium alloy microstructures. However, during the JEMM process, the machined surface of the workpiece inevitably experiences stray current attacks at low current levels. Due to the formation of a dense passive film on the surface of the titanium alloy under electrochemical action, stray corrosion occurs on the machined surface.
View Article and Find Full Text PDFArticle Synopsis
- The study explores a new method for efficiently preparing masks in electrochemical machining by using hard particle masks like titanium and zirconia.
- Numerical simulations and experiments reveal different dissolution behaviors depending on whether the hard particles are insulating or conductive.
- Insulating particles lead to metal dissolving primarily in the gaps between particles, while conductive particles cause dissolution to start at the contact point and expand outward.