Open AccessThe object of this paper is to study a cylindrical helical spring to be applied at high temperatures. The aim of this work is to study the regularity of relaxation stresses in spring and evaluate its long-term stresses.
The work allowed us to establish relaxation dependencies of springs under high temperatures. According to the results of creep tests at 600°, the theoretical equation of steel creep was defined concretely. It was then used for the analysis at 350°.
The paper presents a created finite element model of spring relaxation. It is the stainless steel 08Х18Н10 spring to be used at the temperature of 350°.
In this paper describes the basic theory of creep, considers the relationship between the creep speed and parameters. The changing compression force of springs is analyzed under fixed compression amount.
The paper also analyzes the changing length of springs in the free state after various stages of high-temperature relaxation test. It determines the results of compression forces and free length under different amount of compression.
The analysis to compare the theoretical calculation of the compression forces with the experimental results is conducted. Computer modeling is created in Abaqus for calculation. Spring relaxation experiments are carried out under fixed compression amount and at the temperature of 350°. It is shown that the simulation results, which are carried out in Abaqus coincide with experimental results. The study shows that it is possible to use the creep equation parameters, based on the experimental results at high temperatures, to predict creep and relaxation properties of springs, which work at less high temperatures. The work results can be used as a basis in designing the springs working at high temperatures.