低温环境下栓钉环焊缝焊接残余应力场数值模拟

doi:10.13229/j.cnki.jdxbgxb.20220268

Abstract

Abstract:

In order to study the influence of low temperature environment on the distribution law of welding residual stress， a stud model through ABAQUS for numerical simulation was established， and 5 different temperatures for finite element thermal-solid coupling analysis were considered. The results show that the maximum values of mises stress and radial residual stress are both located at 10 mm near the weld， and decay rapidly with the increase of distance； the hoop residual stress is residual tensile stress near the weld， and is compressive stress away from the weld， and the maximum value is located in the center of the weld； low temperature will increase the residual stress of the weld， the mises stress is concentrated in the center of the weld， the hoop residual stress is concentrated near the weld， and the radial residual stress increases both in the center of the weld and near the weld. The low temperature has a significant effect on increasing the residual tensile stress of welding， but has little effect on the residual compressive stress.

Key words: bridge engineering, stud, low temperature, temperature field, residual stress, numerical simulation

CLC Number:

TU398.9

Xing WEI,Ya-jie GAO,Zhi-rui KANG,Yu-chen LIU,Jun-ming ZHAO,Lin XIAO. Numerical simulation of residual stress field of stud girth weld in low temperature environment[J].Journal of Jilin University(Engineering and Technology Edition), 2024, 54(1): 198-208.

Figures/Tables 16

Fig.1

Fig.2

Table 1

Q345q material thermophysical property parameters"

温度/ $℃$	导热系数/ ［ $W · (m · ℃) - 1$ ］	比热容/ ［J·（kg $? ℃$ ）^-1］	密度/ （kg·m^-3）
-60	51	432	7850
-40	50	437	7850
-20	50	441	7850
0	50	446	7850
20	50	450	7850
100	49	465	7850
200	48	490	7850
300	47	510	7850
500	45	560	7850
700	41	600	7850
1000	28	740	7650
1300	30	700	7350
1500	30	670	7350

Table 1

Table 2

Q345q material mechanical property parameters"

温度/ $℃$	弹性模量/GPa	泊松比 $μ$	屈服应力/ $M P a$	线膨胀系数/ $10 - 5$
-60	209	0.3	385	1.14
-40	207	0.3	374	1.15
-20	201	0.3	367	1.16
0	202	0.3	366	1.30
20	200	0.3	345	1.30
100	197	0.3	332	1.50
200	191	0.3	308	1.50
300	186	0.3	288	1.60
500	145	0.31	219	1.70
700	72	0.31	83	1.70
1000	19.5	0.36	23	1.70
1300	9.5	0.37	5	1.70
1500	0.1	0.39	1	1.70

Table 2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

Fig.14

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