Ultra-High Pressure Die with Carbon Fiber Ring

Our work introduces a double-sided top ultra-high pressure die with a steel ring and a carbon fiber composite ring preloading together. Compared with the double-sided top die of the full steel ring, a layer of carbon fiber composite material ring instead of the outermost steel ring is used in this new structure, which overcomes the challenges of manufacturing and processing large-diameter steel rings and makes a new mutual pre-tightening method, in which steel rings and composite material rings are used to pre-tighten the cylinder. Based on the numerical analysis, the mold structure is proved feasible, and it is further indicated that this structure can reduce the circumferential stress, maximum shear stress and equivalent stress of the cylinder to a certain extent. In addition, the failure of the carbon fiber composite ring is also identified in this work.