Preparation And Properties Of Composite Pipes And Vessels By Filament Wound

Filament wound composite pressure pipes and vessels has been more and morewidely used in many areas such as aeronautics and astronautics, ocean exploration,industry of storage and transportation because of its excellent performance, likelight weight, high pressure, high safety factor, corrosion resistance, safe failuremode etc. The research for filament wound composite pressure pipes and vesselshave a very important guiding significance for theory and value for real processing.In this paper, firstly a horizontal winding machine, a multi-guide head verticalwinding machine and a solidification furnace are developed. The multi-guidevertical winding machine can solve the problem of fibrous support in single-holepressure vessels when wounding in a small angle and solve the problem of fiberstacking in the vessel heads. Then use netting theory finished the structure design offiber ply and use LabVIEW platform writes the assist count program for MCUprogramming of winding machine. Fila ment pipes and vessels are been producedafter the technological parameters have been decided. A hydraulic testing machinewas be developed in order to test the pressure property, inc lude the control andmeasure programs were write base on LabVIEW platform.The pipes were tested by hydraulic failure pressure, radial compressive andinternal pressure fatigue. The test result show that the average circular strength offilament wound pipes is945.1MPa, the main failure type is leakage. The biggestaverage external linear load the pipes can bear is111.5N/mm and the averagestiffness is25.1MPa. With the compression distance increase, the main failure typewill change from composite layering to fiber break. The fatigue main failure type isthe liner buckling. The vessels were tested by several loading and unloading withthe load pressure increase until damage. The pressure, typical area strain andresidues strain have been measured. The result shows the middle of vessel has thebiggest positive strain and the head transition area have negative strain. The damagearea is the middle of vessel, and the main failure type is fiber and matrix break. Thefinite element analys is model has been established by MSC.Marc software. Thestress-strain status of pressure vessel and the pre-tightening value were obtained based on finite element method.