The Simulation Analysis Of Internal-external Collaborative Curing Of Composite Thick-walled Shell

The thin-walled composite shell is usually made from the traditional winding-before-curing method. External curing refers to the method of heating a metalmandrel and winding fiber on the surface of a composite shell and heating until theentire mass solidifies. Improved composite materials, greater shell strength, andmanufacturing techniques have increased the number of applications of thick-walledcomposite shell, including high pressure pipelines and energy storage flywheels. Inthe traditional curing process of thick-walled shell winding, curing takes too long.High energy, low efficiency, greatly increased the cost, curing resin cross-linking,and little guarantee of quality are typical results of this usual process.To achieve high quality thick-walled composite shell solidification, newinternal-external collaborative curing process is proposed. Resin fiber of theimpregnation at predetermined tension winding to a certain thickness on the mandrel,Tensioned, resin-impregnated fiber is wound to a certain thickness on the mandrel.Steam is put in core module, metal mandrel heated pass quantity of heat to fiber resinlayer, at the same time external use carbon fiber infrared quartz heating tube withconstant temperature to fiber resin layer. The new process for thick-walled compositeshell molding has obvious advantages: Internal and external heat sources canimprove heat transfer efficiency, this shortens the molding time; More conducive tocontinuous fiber excess resin impregnated resin bubbles and curing exothermicenergy of discharge and dense composite material; This way can solve local shellbefore around curing caused by lack of quality problem such as glue or layered.In this paper the process of internal-external collaborative curing with steamheating core mold is researched, the principle of the internal-external collaborativecuring process is introduced. Two mathematical models including heat conductionmodel and cure kinetics model of the internal-external collaborative curing processare built, the finite element software ANSYS and APDL language are used to realizenumerical simulation of the process, the Finite element model of the two dimensions what is a case study has carried on the experiment and numerical simulation, thenumerical simulation program of the internal-external collaborative curing process isdeveloped to research the distribution and the variation of temperature and curingdegree. The Finite element model of the three dimensions of the internal-externalcollaborative curing process is developed to research the distribution and thevariation of strain. The numerical simulation of the new process shows that withexternal heating source temperature and heating rate increasing, changing curve oftemperature, curing and strain of center node is increased. With winding speedincreasing, changing curve of temperature, curing and strain of center node isreduced. Research supplies a theoretical basis for optimization of the new internal-external collaborative curing process.