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  • Open Access


    A Model for the Determination of Semi-Circular Spot Corrosion Damage and Residual Strength in Oil Pipes

    Hongtao Liu1, Maoxian Xiong1, Bo Zhang2,*, Junfeng Xie1, Jinrui Deng1, MifengZhao2, Ruijing Jiang1, Yushan Zheng1

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.6, pp. 1709-1720, 2023, DOI:10.32604/fdmp.2023.025513

    Abstract Pitting corrosion often occurs due to the presence of various corrosive substances, such as CO2 and H2S, in the pipe service environment. As a result of this process, the residual strength of oil pipes is reduced and this can compromise the integrity of the entire pipe string. In the present work, a model is introduced on the basis of the API579 standard to determine the so-called stress concentration coefficient. The model accounts for pitting corrosion shapes such as shallow semi-circles, semi-circles, and deep semi-circles. The relationship between the corrosion pit depth and opening diameter and the residual strength of the… More >

  • Open Access


    Numerical Analysis of Residual Strength in the Perforated Casing of Ultra Deep Wells

    Yanxian Wu1, Shouming Zhong1, Zhigang Guan1, Lin Song1, Kun Li2, Jiarui Sun2, Yuqiang Xu2,*, Maochuan Tu3, Chaobin Fan3, Jinbin Yang4

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.1, pp. 261-271, 2023, DOI:10.32604/fdmp.2023.020076

    Abstract A three-dimensional model for the numerical simulation of casing-cement behavior is used to investigate residual strength in the perforated casing of ultra deep wells. The influence of the hole diameter, hole density and phase angle on the residual strength of the casing under non-uniform stress and fracturing conditions is revealed through the consideration of different perforation parameters. It is shown that the residual strength of the casing increases with the hole diameter and periodically changes with the hole density; the phase angle is the main factor that affects the residual strength of the perforated casing, and the perforation should be… More >

  • Open Access


    Uncertainty Analysis of the Residual Strength of Non-Uniformly Loaded Casings in Deep Wells

    Jingpeng Wang1, Wei Zhang1, Zhiwei Lin1, Lin Song1, Shiyuan Xie1, Qi Liu2, Wei Wang2, Tao Yang2, Kai Xu2, Meng Li2, Yuqiang Xu3,*

    FDMP-Fluid Dynamics & Materials Processing, Vol.19, No.1, pp. 105-116, 2023, DOI:10.32604/fdmp.2023.020049

    Abstract An uncertainty analysis method is proposed for the assessment of the residual strength of a casing subjected to wear and non-uniform load in a deep well. The influence of casing residual stress, out-of-roundness and non-uniform load is considered. The distribution of multi-source parameters related to the residual anti extrusion strength and residual anti internal pressure strength of the casing after wear are determined using the probability theory. Considering the technical casing of X101 well in Xinjiang Oilfield as an example, it is shown that the randomness of casing wear depth, formation elastic modulus and formation Poisson’s ratio are the main… More >

  • Open Access


    Residual Strength and Microdamage of Cortical Bone After Non-Destructive Creep Loading

    Ei Yamamoto1,*, Yuki Tanifuji2, Masaya Nishimoto2, Yuki Kawamura2

    The International Conference on Computational & Experimental Engineering and Sciences, Vol.23, No.1, pp. 17-17, 2021, DOI:10.32604/icces.2021.08434

    Abstract Bone tissue is a viscoelastic material which shows time-dependent mechanical manner. Moreover, it is known that bone microdamage is generated by physiological normal mechanical loading in vivo [1-3]. In order to know basic insight into the adverse effects of creep loading on bone strength, in the present study, we focused on the mechanical behavior of cortical bone after nondestructive creep loading at high stress magnitude. Cylindrical specimens were obtained from cortical bone in the longitudinal and tangential direction of bovine femur. We statically applied a compressive stress to the specimens (creep group) for 24 hours. The specimens without creep loading… More >

  • Open Access


    Residual Strength Evaluation of Unstiffened and Stiffened Panels under Fatigue Loading

    A. Rama Chandra Murthy1, G.S. Palani1, Nagesh R. Iyer1

    Structural Durability & Health Monitoring, Vol.5, No.3, pp. 201-226, 2009, DOI:10.3970/sdhm.2009.005.201

    Abstract This paper presents methodologies for residual strength evaluation of metallic structural components under fatigue loading. Structural components include plate panels of different crack configurations with and without stiffeners. For stiffened panels, stress intensity factor (SIF) has been computed by using parametric equations based on numerically integrated modified virtual crack closure integral (NI-MVCCI) technique. As a part of residual strength evaluation, remaining life has also been predicted by using standard crack growth models. Various methodologies for residual strength evaluation, namely, plastic collapse condition, fracture toughness criterion and remaining life approach have been described. From the studies, it has been observed that… More >

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