Research on equivalent thermal stress of photon barrier

The goal of the structural design of the light-blocking element is to make the temperature rise of the absorber and the maximum thermal stress caused by the high thermal load not exceed the specified value of the design criteria. First, according to the actual light source parameters and synchrotron radiation light receiving requirements, determine the size and structure of the light hole, and then consider reducing the radiant power density, using a grazing incidence structure to tilt the light receiving surface at a small angle to the beam line. The entire design process needs to be continuously optimized by means of CAE analysis. Taking the design of photon light barrier as an example, the initial structure of SSRF is a vertical grazing incidence structure, but there is a disadvantage of excessive concentrated stress at the grazing incidence surface and the corners of the two sides.

It is numerically simulated with ANSYS thermal structure coupling analysis module to obtain the maximum temperature of the absorber surface, the maximum temperature of the cooling pipe wall and the maximum equivalent stress value of the absorber under various loading conditions. The results show that: under all working conditions, the two highest temperatures meet the design requirements, but in some cases, the maximum equivalent thermal stress at the corner of the absorber exceeds the yield limit of the material, which does not meet the design criteria. Therefore, three methods of releasing stress concentration, such as increasing the rounded corners at the corners, increasing the size of the through holes and grooving at the corners, were further proposed. The finite element analysis was conducted again and the comparison found that increasing the size of the through holes can significantly reduce the maximum Equivalent thermal stress, while the effect of other methods is not obvious. Change the vertical tilt of the absorber to a horizontal tilt, while leaving a gap at the bottom of the tilted surface, the structure is not fully constrained in the horizontal and vertical directions, and the maximum stress position is at the spot of synchrotron radiation, not at the corner. Can effectively reduce the level of thermal stress. After comparison, it is found that the maximum equivalent thermal stress is reduced by nearly half compared with the structural form.

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