The Optimization Of Mandrel Structure In Internal Curing Based Genetic Algorithm

In recent years, composite shell is widely applied in military area, civilianfield and so on. As the quality of products is demanded strictly, the manufactu-ring process is changed from the external curing to internal curing. The producti-on process is fussy in external curing, the problem is solved by the internalcuring process and the new process also improves the quality of products. Thefabrication of mandrel is often finished based of practice experience, whichcannot ensure the uniformity of temperature distribution in the surface of man-drel. The nonuniform distribution of temperature will induce composite shell tocure inconsistently, and the shell maybe rupture. The temperature distribution ca-nnot be controlled accurately in traditional internal curing, so we need the otherway to realize it.To improve mandrel structure of the internal curing process, the uniformityof temperature distribution in the surface is regarded as a goal. The diameter ofmetal core tube, the diameter and amount of hole in metal core tube are confi-rmed as design variable after analyzing mandrel structure. The samples project ofexperiment is attained by designing experiment, then the response value of samp-le points for designing variables above is attained by finite element simulation.The response curved surface equation is fitted by the way of response curved su-rface according to the correspondences between the design variable and relativevalue in the designing project of experiment, the equation is comparison expre-ssion between design variable and temperature distribution. Next the designingvariable is regarded as optimization variable to determine initial population, andthe curved surface equation based temperature distribution of mandrel surface isobjective function, then the optimal project of mandrel design is gained using ge-netic algorithm by choosing, crossing, aberrance and some other operation.The optimization result is verified by finite element simulation and ex- periment. Firstly, modeling and simulation are used for optimization result bycontrast with initial design, which finds that the temperature distribution ofoptimization mandrel in the surface is more uniform. Secondly, the tube that isproduced using improved mandrel is compared with the tube without improving,which finds the tube after optimizing whose elastic limit increased by4.25%andwhose bursting pressure increased by7.51%.