Study On Residual Stress Of The Composite Materials Barrel

During the manufacture process of the composite material barrel, residual stresswould be made with the cure temperature and the winding tension. The present dissertationaims at a more detailed analysis of the residual stress in the composite material barrel withmetal inner. The results provide reliable theoretical foundation for the application ofcomposite material to artillery barrel. The main contents are included as follows:1. On the basis of mechanics of anisotropic composite material and the theory ofplates and shells, the basic models of the thermal residual stress in the composite materiallaminated flat and the composite material barrel with metal inner are established. Thecodes are written with FORTRAN to calculate the thermal residual stress. In the modelsthe effects of the volume fractions of the resin, the cure temperature, the thickness of themetal inner and the composite material plies and the inner radii of the barrel on the thermalresidual stress are analyzed.2. The model of the residual stress for the winding tension is established. In the modelthe relaxation of the inner composite material lays and the metal inner for the pressure ofthe composite material lay is considered. The codes are written to calculate the residualstress for the winding tension. In the model the effects of the winding angles, the windingtension, the thickness of the metal inner and the composite material plies and the innerradii of the barrel on the residual stress are analyzed.3. The hole-drilling method is selected to measure the residual stress in the compositematerial laminated flat and the composite material simulant barrel with metal inner. On thebasis of mechanics of anisotropic composite material, the relaxation coefficient of throughhole-drilling method is abtained with formulae. The relaxation coefficient of blindhole-drilling method is measured with the demarcate experiment.4. Based on the PXI bus, the system for measuring the residual stress in the compositematerial is constructed. The system is made up of PXI-6251 module collecting the dataduring the experiment, SCXI-1520 module adjusting the relaxing strain signal, FCS load inphase with multicenter system providing the pull during the demarcate experiment, sensorsmeasuring the strain and the pull, charge amplifier adjusting the relaxing pull signal, and soon. The FCS load in phase with multicenter system is set with the special software. ThePXI-6251 module and the SCXI-1520 module are empoldered with the LabVIEW virtualinstruments procedure. The procedure with which the PXI-6251 works solely is compiledand the procedure with which the PXI-6251 works with SCXI-1520 is compiled too. During the exploitation, the isochronous spring of several modules and the self-calibrate ofthe hardware are considered weightily as well as the data acquisition.5. The data of the residual stresses in the composite material laminated flat and thecomposite material barrel with metal inner acquisition with PXI bus system is analyzedand the noises leeching on to the signal are cleared up with wavelet. The effect of thelength of the lead and the size of the strain gauge is considered and the value of strain ismodified.