Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked pipe

doi:10.1007/s11709-012-0169-3

Front Struc Civil Eng

2012, Vol. 6

Issue (3) : 217-223 https://doi.org/10.1007/s11709-012-0169-3

RESEARCH ARTICLE

Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked pipe

Xiaobo REN¹, Odd M. AKSELSEN^1,2, B?rd NYHUS², Zhiliang ZHANG¹(

)

1. Norwegian University of Science and Technology, N-7491 Trondheim, Norway; 2. SINTEF Materials and Chemistry, N-7465 Trondheim, Norway

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Abstract

Welding residual stress is one of the main concerns for fabrication and operation of steel structures due to its potential effect on structural integrity. This paper focuses on the effect of welding residual stress on the ductile crack growth resistance of circumferentially cracked steel pipes. Two-dimensional axi-symmetry model has been used to simulate the pipe. Residual stresses were introduced into the model by using so-called eigenstrain method. The complete Gurson model has been employed to calculate the ductile crack growth resistance. Results show that residual stresses reduce the ductile crack growth resistance. However, the effect of residual stresses on ductile crack growth resistance decreases with the increase of crack growth. The effect of residual stress has also been investigated for cases with different initial void volume fraction, material hardening and crack sizes.

Keywords residual stress ductile crack growth resistance complete Gurson model eigenstrain method

Corresponding Author(s): ZHANG Zhiliang,Email:zhiliang.zhang@ntnu.no

Issue Date: 05 September 2012

Cite this article:

Xiaobo REN,Odd M. AKSELSEN,B?rd NYHUS, et al. Influence of welding residual stresses on the ductile crack growth resistance of circumferentially cracked pipe[J]. Front Struc Civil Eng, 2012, 6(3): 217-223.

URL:

https://academic.hep.com.cn/fsce/EN/10.1007/s11709-012-0169-3
https://academic.hep.com.cn/fsce/EN/Y2012/V6/I3/217

Fig.1 (a) Sketch of the geometry for a pipe with hyperbaric weld; (b) schematic illustration of the axi-symmetry model

Fig.2 Finite element mesh of the model, global mesh (left) and local mesh (right)

Fig.3 Distribution of welding residual stresses before and after the crack was inserted. Superscript “crack” represents the residual stress distribution after the crack was introduced.

Fig.4 Effect of residual stresses on ductile crack growth resistance, = 0.05, = 581 MPa, = 207000 MPa, = 0.3, = 0.005

Fig.5 Normalized ductile crack growth resistance, = 0.05, = 581 MPa, = 207000 MPa, = 0.3, = 0.005. with represents the CTOD with residual stress effect, and denotes the CTOD without residual stresses effect.

Fig.6 Effect of residual stresses on ductile crack growth resistance for different initial void volume fractions, = 0.05, = 581 MPa, = 207000 MPa, = 0.3

Fig.7 Effect of residual stresses on ductile crack growth resistance for different material hardening, = 0.001, = 581 MPa, = 207000 MPa = 0.3

Fig.8 Effect of residual stresses on ductile crack growth resistance for different crack sizes, = 0.001, = 581 MPa, = 207000 MPa, = 0.3, = 0.005

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