Simulation method for welding residual stress of quartz flexible accelerometer

Abstract

Disclosed is a simulation method for welding residual stress of a quartz flexible accelerometer. The simulation method includes the following steps: selecting a finite element unit combining with generation mechanism of welding residual stress; constructing a material model base; constructing a structural model of an accelerometer; constructing a finite element model of the accelerometer; exerting constraint and load; performing direct thermal stress coupling simulation; cooling naturally, retaining the residual stress, remaining the model the same, deleting heat-flow density load, simulatinga natural cooling process, still performing direct thermal stress coupling transient simulation, and working out variations of temperature and stresses during the cooling process. The invention provides a transient direct thermal stress coupling simulation method based on the finite element model of the quartz flexible accelerometer. By means of the simulation method, distribution of residual stress of weld points can be obtained, simulation results can be used as inputs of the simulation process of vibratory residual stress relief, and foundations are laid for further study on vibratory stress relief.

Description

technical field [0001] The invention relates to a welding residual stress simulation method of a quartz flexible accelerometer, in particular to a quartz flexible accelerometer welding residual stress simulation method based on finite element software ANSYS direct thermal stress coupling simulation, belonging to the technical field of finite element simulation. Background technique [0002] An accelerometer is a sensor device that converts the acceleration of a carrier into an electrical signal through various measurement methods. Since the first accelerometer appeared at the end of the Second World War, with the development of science and technology, the accelerometer has also been continuously developed and improved. There have been nearly a hundred different types of accelerometers. Among them, the quartz flexible accelerometer has been widely used in many fields such as precision guidance and aerospace due to its advantages of small size, fast response and high sensitivi...

AI Technical Summary

Problems solved by technology

There are experimental testing and finite element simulation methods for studying welding residual stress. However, the experimental testing of welding residual stress has great limitations: the non-destructive method can only measure the stress state on the surface of the welded structure; even if the destructive method is used , the three-dimensional residual stress field is also difficult to calculate accurately

Through the search of existing technical literature based on finite element simulation at home and abroad, it is found that the finite element simulation of quartz flexible accelerometers mostly focuses on static stress and modal calculations, and there is no simulation of welding residual stress of quartz flexible accelerometers.

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