Numerical Analysis of explosion effects on the redistribution of residual stresses in the underwater welded pipe

Bayat, Amirhossein; Moharami, Rasoul

doi:10.22059/jcamech.2016.59261

Numerical Analysis of explosion effects on the redistribution of residual stresses in the underwater welded pipe

Document Type : Research Paper

Authors

Amirhossein Bayat ¹
Rasoul Moharami ²

¹ University of Zanjan

² Assistant professor of engineering department, University of Zanjan

10.22059/jcamech.2016.59261

Abstract

Structural health monitoring of cracked structures is one of beloved subject of researchers recently. Consider of crack behavior in the water and energy pipeline is important because of environmental problems. In this paper consider of crack parameters in the underwater pipe subjected to mechanical transient load is investigated. For this purpose, three- dimensional parametric model of cracked pipe has been presented for calculation of J integral values. Underwater explosion load model has been used for applying the transient load and J integral values have been obtained in circumferential and axial semi-elliptical internal cracks. Obtained results is shown that under mentioned condition, pipe isn’t safe and crack grow is happening in the inner surface of crack. According to results for integrity of structure must be safe stand-off distance (distance of charge with respect to pipe) greater than previous state. Obtained values in this paper is used for estimation of structure life and Repair and maintenance are useful.

Keywords

Main Subjects

Stress Analysis

References

[1]. M. Enderlin, Comparison of finite element techniques for 2D and 3D crack analysis under impact loading, Int. Journal of Solids & Structures, Vol.40, No.1, pp.3425-3437,2003.

[2]. Seong Hyeok Song, Dynamic stress intensity factors for homogeneous and smoothly heterogeneous material using the interaction integral method, Int. Journal of Solids & Structures, Vol.43, No.1, pp.4830-4866, 2006.

[3]. S.Itou, Dynamic stress intensity factors around a cylindrical crack in an infinite elastic medium subject to impact load, Int. Journal of Solids & Structures, Vol.44, No.1, pp.7340-7356, 2007.

[4]. Chunyu Li, G.J.Wang, Dynamic fracture analysis for a penny-shape crack in an FGM interlayer between dissimilar half space, Mathematics and mechanics of solid, Vol.7, No.2, pp.149-163, 2002.

[5]. Sanichiro Yoshida, Comprehensive description of deformation and fracture of solids as wave dynamic, Mathematics and mechanics of solid, 2015.

[6]. S.M. Nabavi, A.R. Shahani, Dynamic stress intensity factors for a longitudinal semi-elliptical crack in a thick walled cylinder, Int. Journal of engineering science and technology, Vol.6, No.5, pp.57-77, 2014.

[7]. M.Ayatollahi, Dislocation technique to obtain the dynamic stress intensity factors for multiple crack in half-plane under impact load, Arch Appl mech, Vol.84, No.1, pp.95-107,2013.

[8]. R.H. Cole, Underwater Explosion, Princeton University Press, 1948.

[9]. R. Rajendran, reloading effects on plane plates subjected to non-contact underwater explosion, Journal of material processing technology, Vol.206, No.1, pp. 275-281, 2008.

[10]. R. Rajendran, K, Narasimhan, Linear elastic shock response of plane plate subjected to underwater explosion, Int. Journal of Impact Engineering, Vol.25, No.1, pp.493-506, 2001.

[11]. S.A. Meguid, Engineering fracture mechanic, Springer, 1989.

[12]. Ch. Zhang, On wave propagation in elastic solids with crack, Computational Mechanics Publication, Boston USA, 1998.

[13]. Djarot B. Darmadi, Residual Stress Analysis pipeline girth weld joints. PHD Thesis. University of Wollongong. 2014