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  • Open Access


    Crack Propagation in Pipelines Under Extreme Conditions of Near-Neutral PH SCC

    Abdullah Alsit*, Mohammad Alkhedher, Hasan Hamdan

    CMC-Computers, Materials & Continua, Vol.73, No.3, pp. 5315-5329, 2022, DOI:10.32604/cmc.2022.031042

    Abstract Stress Corrosion Cracking (SCC) process through which cracks occur in a variety of susceptible materials is a result of a combination of residual or applied stresses and corrosion. In oil and gas field, buried pipeline steels are made of low-alloy steels with a ferritic-pearlitic structure, such as X70. In dilute solutions, these materials are prone to SCC failure. The Near-neutral simulated soil solution (NS4) solution is established to imitate SCC conditions and subsequently became the industry requirement for crack growth experiments in the majority of laboratories. The strain-assisted active crack pathways are considered while modelling… More >

  • Open Access


    Theory and Calculation of the J-Integral for Coupled Chemo-Mechanical Fracture Mechanics

    Wei Wei1, Qingsheng Yang2,*, Xia Liu2, Xiaoqiao He3,*, Kim-Meow Liew3

    CMES-Computer Modeling in Engineering & Sciences, Vol.115, No.3, pp. 387-409, 2018, DOI: 10.3970/cmes.2018.01856

    Abstract In this paper, by introducing a chemical field, the J-integral formulation is presented for the chemo-mechanical coupled medium based on the laws of thermodynamics. A finite element implementation of the J-integral was performed to study the mode I chemo-mechanical coupled fracture problem. For derivation of the coupled J-integral, the equivalent domain integral (EDI) method was applied to obtain the mode I J-integral, with expression of the area integrals based on constitutive relationships of a linear elastic small deformation for chemo-mechanical coupling, instead of the finite deformation problem. A finite element procedure is developed to compute… More >

  • Open Access


    J-Integral Evaluation of Cracked Shell Structures Employing Effective Reproducing Kernel Meshfree Modeling

    M. J. Dai, S. Tanaka*

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 16-16, 2019, DOI:10.32604/icces.2019.05895

    Abstract The J-integral evaluation are analyzed employing effective reproducing kernel method. Several numerical examples of cracked shell structure are carried out to investigate the mixed-mode stress resultant intensity factors (SRIFs). It is formulated by the first order shear deformation plate theory. Reproducing kernel (RK) is used to the meshfree interpolant. A diffraction method, visibility criterion and enriched basis are introduced to model the through crack. J-integral is evaluated based on the stress resultants and is decomposed into the symmetric and asymmetric parts for extracting the mixed-mode SRIFs. The stabilized conforming nodal integration (SCNI) and sub-domain stabilized More >

  • Open Access


    Three-Dimensional J-Integral Based on a Domain Integral Method for Non-Homogeneous Solid with Residual Stresses Undergoing Large Deformation

    Hiroshi Okada*, Tatsuro Ishizaka, Akira Takahashi, Koichiro Arai, Yasunori Yusa

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.21, No.1, pp. 10-11, 2019, DOI:10.32604/icces.2019.05037

    Abstract In this paper, a new three-dimensional J-integral for non-homogeneous solids undergoing large deformation and associated with residual stresses is presented. The formulation of J-integral involves the strain energy density W that is generally defined by the integral W = ∫0t τijε·ijdt over the entire deformation history of a material point where tij and ε·ij are the components of the Kirchhoff stress and those of velocity strain. t and t represents the time. It is assumed that at t = 0 the body is free from any deformation and therefore the stresses are zeros.
    Residual stresses are induced by… More >

  • Open Access


    Three-Dimensional Dynamic Fracture Analysis Using the Material Point Method

    Y. J. Guo1, J. A. Nairn2

    CMES-Computer Modeling in Engineering & Sciences, Vol.16, No.3, pp. 141-156, 2006, DOI:10.3970/cmes.2006.016.141

    Abstract This paper describes algorithms for three-dimensional dynamic stress and fracture analysis using the material point method (MPM). By allowing dual velocity fields at background grid nodes, the method provides exact numerical implementation of explicit cracks in a predominantly meshless method. Crack contact schemes were included for automatically preventing crack surfaces from interpenetration. Crack-tip parameters, dynamic$J$-integral vector and mode I, II, and III stress intensity factors, were calculated from the dynamic stress solution. Comparisons to finite difference method (FDM), finite element method (FEM), and boundary element method (BEM), as well as to static theories showed that More >

  • Open Access


    Evaluation of Elastic-Plastic Crack Tip Parameters using Partition of Unity Finite Element Method and Pseudo Elastic Analysis

    Raju Sethuraman1, N.R.Rajesh2

    CMES-Computer Modeling in Engineering & Sciences, Vol.39, No.1, pp. 67-100, 2009, DOI:10.3970/cmes.2009.039.067

    Abstract This paper presents a methodology based on Partition of Unity Finite Element Method (PUFEM) and Pseudo Elastic Analysis for solving material non-linear fracture problems within the scope of total deformation theory of plasticity. Local enrichment base functions are used to represent the asymptotic field near the crack tip and discontinuous field across the crack faces. An iterative linear elastic analysis using PUFEM is carried out for the determination of elastic-plastic crack tip stress fields by treating effective material properties as spatial field variables. The effective material parameters are defined using deformation theory and are updated… More >

  • Open Access


    Time-Dependent J-Integral Solution for Semi-elliptical Surface Crack in HDPE

    M. Bendouba1, A. Djebli1, A. Aid1, N. Benseddiq2, M. Benguediab3

    CMC-Computers, Materials & Continua, Vol.45, No.3, pp. 163-186, 2015, DOI:10.3970/cmc.2015.045.163

    Abstract This work focuses on a linear elastic analysis by the finite element method and the development of a shape function, commonly known as geometrical correction factor, for the case of semi-elliptical crack in a cylindrical rod. We used the same shape function to analyze the behavior of the rod in the case of a viscoelastic medium materialized by a polymeric material such as HDPE. A linear viscoelastic model calibrated from a relaxation test was developed and implemented in Abaqus. Results showed a relatively good performance, compared with finite element method. More >

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