Abstract:Aiming at the pressure gauge works in the deep sea environment under high ambient pressure, research was carried out on the stress and strain characteristics of the bourdon tube under great pressure stress in deep sea environment to explore the pressure gauge can work effectively or not. The nonlinear finite element model (FEM) of bourdon tube was established based on ANSYS. Through the finite element analysis (FEA) simulation of C type bourdon tube under high ambient pressure and nonambient pressure, two kinds of working conditions were compared to find out the stress and strain characteristics of the bourdon tube under high ambient pressure. Testing was carried out in deep sea simulation cabin to prove the results. The simulation results show that the deep sea high pressure environment will reduce the maximum strain of the bourdon tube, with the maximum error is 10% within the range of the allowable error. The stress distribution is constant, and the maximum stress decreases. The deep sea high pressure environment will make the working number of C type bourdon tube pressure gauge decreases, but the number error is within the allowable working range. No failure of the bourdon tube works under high pressure, and the pressure gauge can work effectively.