Mechanical Properties Test Of Glidcop And Thermal Structural Analysis Of High-heat-load Components In SSRF

Shanghai Synchrotron Radiation Facility (SSRF) is a third-generation of synchrotron radiation light source, one of the most important characteristics different from the first and second light source is that it has extremely high radiation power and power density, up to tens or hundreds of watts per square millimeter.Between the storage ring and beam line is the front end which plays an important role in limiting the size of export synchrotron radiation ray, protecting storage ring vacuum environment, absorbing high heat load, and protecting downstream optical components.With high power and high power density, the third-generation of synchrotron radiation facility makes many difficulties to the design of the front end. Grazing incidence structure is used to reduce power density on photon shutter, with small angle of incidence, big irradiation area, slotted along irradiation light direction, water cooling and manufactured with better thermal properties of materials.The strength of the structure and the thermo-mechanical fatigue in frequently blocking synchrotron irradiation are both important. Low-cycle high temperature fatigue and thermal-fatigue are essentially low cycle strain fatigue with equivalent temperature and strain. They have the same fatigue strain-life curve. So we can predict thermal-fatigue life with low-cycle high temperature fatigue.Glidcop is widely used to manufacture the high-heat-load components in the front end. Glidcop is Al2O3 particle-reinforced copper alloy. The aluminum oxide particles are hard thermally stable at high temperatures, hence the superior high temperature properties of Glidcop, no loss on heat conduction markedly.We studied tensile and fatigue properties of Glidcop from SSRF with MTS test machine, Its elastic modulus, yield strength, tensile strength and strain fatigue life curves at room temperature, 200℃and 400℃were obtained. The thermal conductivity and thermal expansion coefficient with respect to fatigue strain state were also tested.The deformation in photon shutter under local high heat load changes the smooth surface and incident angle, therefore the heat load is redistributed and the temperature and strain fields are also different from the initial analysis. The FEA simulation of a simple cuboid instead of high-heat-load component is carried out, changing the incidence angle and heat flux density after strain analysis until the strain field is stabilized. The difference between stabilized maximum strain and origin strain is less than 7% when the incidence angle is between 1.5°and 12°with the maximum temperature around 600℃. Therefore, the deformation of plane surface to heat flux density under high heat load can be neglected.