Mechanical Behavior And Demage Mechanism For Peek Irradiated With Charged Particle

In this paper, we take 1Me V high energy electron and 70 ke V, 170 ke V low energy proton as irradiation source,studied the mechanical behavior and damage mechanism of high energy electron and low energy proton irradiation of Poly ether ether ketone(PEEK),using small angle X ray scattering(SAXS) and wide angle X ray diffraction(WAXD) technique, studied the evolution law of the microstructure of PEEK irradiated by high energy electron in the tensile process. Using synchrotron radiation grazing incidence small angle X ray scattering(GISAXS), analyzed the microstructures in different depth of PEEK after irradiated by different levels of energy and fluence. Also, combined with materials analysis methods such as DSC,EPR, FTIR and XPS,I analyzed the crystallinity, free radical, group and chemical composition of PEEK before and after irradiation.All the work I did could provide the necessary basis for revealing the mechanical behavior of PEEK radiation of charged particles and damaging mechanism.High energy electron irradiation tests shows that there are three stages in the process of tensile deformation of PEEK materials.The effect of irradiation on the tensile strength was small while the fracture elongation of the material was significantly reduced. The SAXS analysis shows that the diffraction peak appeared in the meridian direction and there was not a new diffraction peak and crystal formed in the stretching process. Extract the orientation factor from the SAXS scattering signal shows that irradiation could inhibit the deformation of PEEK. The long period increases along with the increase of irradiation fluence, the crystal gradually tends to be amorphous state and the irradiation inhibited this kind of transformation. WAXD analysis shows that with the increase of tensile deformation,the intensity of each peak is gradually weakened at different rates and along with the disappearance of some peaks. From the ratio of the diffraction peak, the disappearance rate of the irradiated peak is lower than that of the non-irradiated; this shows that the main reason of disappearance of the PEEK diffraction peak is irradiation.Grazing incidence small angle X ray scattering test results show that with different incident angles the PEEK has long period structure, and appeared the phenomenon of stratification. After low energy proton irradiation of 70 ke V and170 ke V with different fluence and increasing irradiation dose, long period structure was gradually weakened, when the irradiation dose reached a certain degree, the long period structure disappeared and the thickness of the layer has also changedwhich was accompanied by the disappearance of layers. Comparison of proton irradiation with different energy 70 ke V and 170 ke V, results shows when the PEEK material was irradiated by different fluence and energy, at a given angle, with the increase of irradiation energy, long period structure gradually weakened and finally disappeared; at a certain angle of incidence with the increase of irradiation energy,stratification phenomenon was less and less obvious, and the distance between the layer and the layer has greatly changed.