سیستم های تخصصی برای برنامه ریزی عملیات ساخت مخازن تحت فشار توسط کشش عمیق و اتو کردن

The fiber reinforced composite material is widely used in the multi-industrial field where the weight reduction of the infrastructure is demanded because of their high specific modulus and specific strength. It has two main merits which are to cut down energy by reducing weight and to prevent explosive damage proceeding to the sudden bursting which is generated by the pressure leakage condition. Therefore, pressure vessels using this composite material in comparison with conventional metal vessels can be applied in the field such as defence industry, aerospace industry and rocket motor case where lightweight and the high pressure are demanded. In this paper, for non-linear finite element analysis of E-glass/epoxy filament wound composite pressure vessel receiving an internal pressure, the standard interpretation model is developed by using the ANSYS, general commercial software, which is verified as the accuracy and useful characteristic of the solution based on AutoLISP and ANSYS APDL. Both the preprocessor for doing exclusive analysis of filament wound composite pressure vessel and postprocessor that simplifies result of analysis have been developed to help the design engineers.

The FRP (fiber reinforced plastic) being spotlighted as new material is widely used in the multi-industrial field where the weight reduction of the infrastructure is demanded because of their high specific modulus and specific strength [1]. Filament winding method using specific stiffness and specific strength such as fiber glass, cable, and carbon fiber in manufacturing a symmetric or revolutionary composite material-fabric is more suitable in view of cost of manufacturing, time to be used, and mass production [2]. Filament wound composite pressure vessel has in view of analysis non-linear problems complicated such as the contact between steel liner and laminate, the residual stress by autofrettage process, transient analysis of load changed according to time, and mechanical strain by high pressure gas. In order to solve and analyze above items, it needs empirical results and the empirical knowledge of field experts to the designers. This study focuses on the development of standard analysis model using a commercial software ANSYS, which is verified to its exactness and usefulness, to carry out non-linear FE analysis of E-Glass/epoxy filament wound pressure vessel. The steel linear is pressurized as a part of it and manufactured by first drawing using tractrix die and the DDI (deep drawing and ironing) process. And also this paper concentrates on the development of an automated design system of filament wound CNG composite pressure vessel, which is able to carry out analysis as only inputting design parameters such as winding pattern, winding thickness, and fiber angle, and pressure to the analysis module of the system based on AutoLISP and ANSYS APDL (ANSYS parametric design language) [3] and [4].

In this study, design rules were established for manufacturing the large-sized high pressure vessel of 34CrMo4 steel. The automated DDI process design system was developed and has the following features. The drawing ratio without folding was determined through the product feasibility check module. Diameters of punch and die for feasible process are automatically able to be calculated and verified. The process design module is automatically able to generate process planning drawing through quantified rules. Also distance between dies was obtained to minimize the maximum punch load by finite element analysis. In order to obtain higher compressive residual stress by raising autofrettage pressure, after cylinder with the same thickness is wrapped, autofrettage process is performed to manufacture the vessel by DDI process.