Study of vibratory stress relief effect of quartz flexible accelerometer with FEA method

Residual stress relaxation is one of the reasons for parameter drift of quartz flexible accelerometer with laser spot welding structure. Residual stress of laser spot welding is simulated by thermal analysis and thermal stress analysis of the welding process with ANSYS. Dynamic vibration analysis is carried out to evaluate the effectiveness of VSR process for laser spot welding and investigate the effect of VSR process factors on the residual stress distribution. Results show that vibration can decrease the welding residual stress and VSR with resonant frequency has better residual stress relief effect than that of non-resonant frequency. The study may provide a better understanding of how residual stress relief occurs and how VSR can be used in precise instrument effectively.