The study on stress-strain state of the spring at high temperature using ABAQUS

Nauka i Obrazovanie

H Sun¹  V. L. Danilov¹ 

[1] Bauman Moscow State Technical University;

关键词: creep;    relaxation;    helical spring;    ABAQUS;   

DOI  :  10.7463/0514.0710723

来源: DOAJ

【 摘 要 】

Cylindrical helical springs are widely used in the elements of thermal energy devices. It is necessary to guarantee the stability of the stress state of spring in high temperature. Relaxation phenomenon of stress is studied in this paper. Calculations are carried out in the environment of ABAQUS. The verification is taken out using analytical calculations.

This paper describes the distribution and character of stress contour lines on the cross section of spring under the condition of instantaneous load, explicates the relaxation law with time. Research object is cylindrical helical spring, that working at high temperature. The purpose of this work is to get the stress relaxation law of spring, and to guarantee the long-term strength.

This article presents the basic theory of helical spring. Establishes spring mathematical model of creep under the loads of compression and torsion. The stress formulas of each component in the cross section of spring are given. The calculation process of relaxation is analyzed in the program ABAQUS.

In this paper compare the analytical formulas of spring stress with the simulation results, which are created by program ABAQUS.

Finite element model for stress creep analysis in the cross section is created, material of spring – stainless steel 10X18N9T, springs are used at the temperature 650℃.

At the beginning, stress-stain of spring is in the elastic state. Analyzes the change law of creep stress under the condition of constant load and a fixed compression.

When analyzing under the condition of a fixed compression, the stresses are quickly decreased in most area in the cross section of spring, and the point of minimum shear stress gradually moves to the direction of outer diameter, because of this, stresses in a small area near the center increase slowly at first then decrease gradually with time. When analyzing under the condition of constant load, the stresses are quickly decreased in the around area and in creased in center, which indicated the maximum and minimum stresses get closed with time. Research work can provide a theoretical basis for the design of the spring at high temperatures.

【 授权许可】

Unknown