International Journal of Pressure Vessels and Piping最新文献_第8页

Impact of different welding processes on the pneumatic bulge test at a high temperature: Gas Tungsten Arc Welding and Laser Beam Welding 不同焊接工艺对高温下气动胀形试验的影响：气体钨极保护焊和激光束焊接

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-11-15 DOI: 10.1016/j.ijpvp.2025.105703

Zi-Jian Guo , Jin Shi , Jing-Huan Chang , Jia-Xing Wang , Yun Zhou , Jian-Feng Wen , Shan-Tung Tu

Pneumatic bulge test (PBT), as a novel small specimen testing method, demonstrates significant potential for assessing mechanical properties of materials. The current method necessitates welding to ensure stable loading of pneumatic pressure. However, the influence of the welding process on PBT test results has not been effectively evaluated. This study examines the impact of this factor by analyzing the microstructure of welded joints between the specimen and the lower holder. It also evaluates the effects of Gas Tungsten Arc Welding (GTAW) and Laser Beam Welding (LBW) on SUS 304 specimens tested at 600 °C, comparing their pressure-deflection (P-D) curves with finite element simulations that exclude welding. The results reveal that both welded specimens ruptured at the center, but LBW curves closely matched simulations, in contrast to those for GTAW. This discrepancy is explained by morphological analysis, which indicates that GTAW joints are wider and deeper due to lower energy density and slower cooling, with LBW joint width and depth being 34.8 % and 45.9 % of those of GTAW joints. Additionally, LBW joints exhibit fine columnar dendrites and significant carbide precipitation, while GTAW joints show coarser grains and a broader heat-affected zone. Moreover, hardness tests reveal GTAW joints are ∼50 % harder with steeper gradients, leading to stronger constraints at the edges of GTAW specimens compared to LBW-welded specimens. Consequently, the GTAW specimens require greater deformation resistance during loading, resulting in higher P-D curves. These findings suggest that LBW is likely more favorable than GTAW for PBT tests.

气动胀形试验（PBT）作为一种新型的小试件试验方法，在评估材料力学性能方面具有重要的潜力。目前的方法需要焊接来保证气压的稳定加载。然而，焊接工艺对PBT测试结果的影响尚未得到有效评价。本研究通过分析试样与下支架之间焊接接头的显微组织来检验这一因素的影响。本文还评估了在600°C下进行钨极气体保护焊（GTAW）和激光束焊接（LBW）对SUS 304试样的影响，并将其压力-偏转（P-D）曲线与排除焊接的有限元模拟进行了比较。结果表明，两种焊接试样均在中心处破裂，但LBW曲线与模拟结果非常吻合，而GTAW曲线则相反。形态分析表明，由于能量密度较低、冷却速度较慢，GTAW接头较宽、较深，其中LBW接头的宽度和深度分别为GTAW接头的34.8%和45.9%。此外，LBW接头表现出细小的柱状枝晶和显著的碳化物析出，而GTAW接头表现出更粗的晶粒和更宽的热影响区。此外，硬度测试表明，与lbw焊接试样相比，GTAW接头在陡坡上的硬度为50%，导致GTAW试样边缘的约束更强。因此，GTAW试样在加载过程中需要更大的变形抗力，从而导致更高的P-D曲线。这些发现表明LBW可能比GTAW更有利于PBT测试。

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引用次数: 0

Extremely low-cycle fatigue crack growth evaluation of carbon steel pipe with circumferential surface crack by reference stress method 参考应力法评价含周向表面裂纹的碳钢管极低周疲劳裂纹扩展

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-10-13 DOI: 10.1016/j.ijpvp.2025.105684

Masahiro Takanashi , Kiminobu Hojo , Masao Itatani , Motoki Nakane , Kenji Yashirodai , Yukio Takahashi , Hiroshi Okada

This study presents a simplified evaluation of extremely low-cycle fatigue crack growth beyond small-scale yielding conditions using the reference stress method. Japan, a country frequently affected by earthquakes, faces critical challenges in ensuring the structural integrity of nuclear power plants under the excessive loads caused by large-scale seismic events. To address these challenges, the FDF Subcommittee (Phases I to III) was established under the Atomic Energy Research Committee of the Japan Welding Engineering Society. As part of its work, the FDF Subcommittee developed a guideline for evaluating crack growth using the reference stress method. This study consolidates the findings of the FDF Subcommittee. To validate the guideline, extremely low-cycle fatigue tests were conducted on a carbon steel pipe with a circumferential crack subjected to four-point bending, resulting in a through-wall life of a few hundred cycles. The crack growth behavior observed in the fatigue tests was analyzed in accordance with the guideline, which predicts crack length and depth based on the J-integral evaluated using the reference stress method, without resorting to elasto-plastic analysis. On average, the analysis consistently predicted through-wall lives approximately 33 % longer than those obtained in the tests. Despite this discrepancy, the simplicity of the reference stress method, which eliminates the need for finite element analysis, makes the guideline highly valuable from an engineering perspective. Furthermore, the experimental findings provided critical insights into the limitations of the reference stress method.

本文提出了一种基于参考应力法的小尺度屈服条件下极低周疲劳裂纹扩展的简化评价方法。日本是一个地震频发的国家，在大规模地震事件造成的过大载荷下，如何保证核电站的结构完整性面临着严峻的挑战。为了应对这些挑战，日本焊接工程学会原子能研究委员会成立了FDF小组委员会（第一至第三阶段）。作为其工作的一部分，FDF小组委员会制定了使用参考应力法评估裂纹扩展的指南。这项研究巩固了基金小组委员会的调查结果。为了验证该准则，对一根具有圆周裂纹的碳钢管进行了极低周疲劳试验，并进行了四点弯曲，结果表明其穿壁寿命为几百次循环。根据该准则对疲劳试验中观察到的裂纹扩展行为进行了分析，该准则基于参考应力法评估的j积分来预测裂纹长度和深度，而不采用弹塑性分析。平均而言，分析一致预测的穿壁寿命比测试中获得的寿命长约33%。尽管存在这种差异，但参考应力法的简单性，消除了对有限元分析的需要，使得该指南从工程角度来看具有很高的价值。此外，实验结果对参考应力法的局限性提供了重要的见解。

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引用次数: 0

Influence of hydrogen pressure on fracture toughness degradation of AISI 4130 Steel: Experimental and finite element study 氢压力对AISI 4130钢断裂韧性退化影响的实验与有限元研究

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-10-25 DOI: 10.1016/j.ijpvp.2025.105675

Yuman Sun , Wenhong Ding , Zhonghai Zang , Hongyuan Ding , Zhuang Chen , Chenxu Wang

This study investigates the degradation of fracture toughness in AISI 4130 steel exposed to high-pressure hydrogen through integrated experimental testing and finite element modeling. Slow strain rate tensile (SSRT) and elastic-plastic fracture toughness tests were performed at 5 MPa, 10 MPa, and 30 MPa hydrogen pressures, with ambient air serving as a reference. Experimental results revealed a pronounced deterioration of mechanical properties, evidenced by a significant reduction in elastic-plastic fracture toughness (J_IC) from 60.34 kJ/m² in ambient air to 9.99 kJ/m² under 30 MPa hydrogen pressure. Concurrently, the hydrogen embrittlement index (I_HE) increased from 70.68 % at 5 MPa to 86.26 % at 30 MPa. Fractographic analysis further demonstrated a progressive transition from ductile microvoid coalescence (MVC) in ambient air to a mixed mode of quasi-cleavage (QC) and martensitic lath decohesion (MLD) at intermediate pressures, and ultimately to intergranular (IG) fracture at 30 MPa. Coupled finite element simulations elucidated hydrogen diffusion and accumulation at the crack tip under stress gradients. The numerical analysis confirmed that elevated hydrogen pressure enhanced both lattice and trapped hydrogen enrichment, leading to intensified strain localization and a reduction in the critical stress required for crack propagation. These numerical results corroborated the experimental observations, confirming that the synergistic effects of hydrogen-enhanced localized plasticity (HELP) and hydrogen-enhanced decohesion (HEDE) mechanisms inhibit crack-tip blunting, reduce energy dissipation, and accelerate the transition from ductile to brittle fracture. These findings provide a mechanistic foundation for predicting fracture behavior in high-pressure hydrogen environments and underscore the necessity of incorporating fracture toughness degradation into structural integrity assessments of high-pressure hydrogen storage systems.

通过综合实验测试和有限元模拟，研究了高压氢作用下AISI 4130钢断裂韧性的退化情况。慢应变速率拉伸（SSRT）和弹塑性断裂韧性测试分别在5 MPa、10 MPa和30 MPa氢气压力下进行，环境空气为参考。实验结果表明，材料的力学性能明显恶化，其弹塑性断裂韧性（JIC）从环境空气中的60.34 kJ/m2显著降低到30 MPa氢气压力下的9.99 kJ/m2。同时，氢脆指数（IHE）由5 MPa时的70.68%增加到30 MPa时的86.26%。断口分析进一步表明，在中等压力下，从空气中的韧性微孔隙聚结（MVC）逐渐转变为准解理（QC）和马氏体板条脱裂（MLD）的混合模式，最终转变为30 MPa下的晶间断裂（IG）。耦合有限元模拟揭示了应力梯度作用下裂纹尖端氢气的扩散和积累过程。数值分析证实，氢压力的升高增强了晶格和捕获氢的富集，导致应变局部化加剧，裂纹扩展所需的临界应力降低。这些数值结果证实了实验观察结果，证实了氢增强局部塑性（HELP）和氢增强脱黏（HEDE）机制的协同作用抑制了裂纹尖端钝化，减少了能量耗散，加速了韧性断裂向脆性断裂的转变。这些发现为预测高压氢气环境下的断裂行为提供了机制基础，并强调了将断裂韧性退化纳入高压储氢系统结构完整性评估的必要性。

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引用次数: 0

Hydrodynamic pressures and mechanical behaviour of unanchored rigid tanks subjected to rocking accelerations 受摇摆加速度影响的非锚定刚性储罐的动水压力和力学行为

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-09-26 DOI: 10.1016/j.ijpvp.2025.105667

Enrico Zacchei , Reyolando Brasil , Tomoyo Taniguchi

Circular tanks are structures plated in industrial and nuclear plants usually used to storage water, petroleum, and gas. In seismic area they must be well design to avoid environmental and economic disasters due to possible content leaks. In codes the basic model to analyse the fluid-tank system consists in two components (impulsive and convective) under horizontal accelerations, thus rocking motions and uplifts are almost neglected. In this paper rigid unanchored tanks have been studied by considering the additional pressures generate by rocking motions and uplifts. For this, accurate analytical and parametrical analyses have been carried out in a dynamic and static way. The approximated solutions provided higher values in favour of safety in order to compensate the neglected rocking motions. The obtained pressures are useful to well estimate the hoop stresses in the base plate due to uplifts. For relative high rotations, a coupling interaction between sloshing and rocking is possible producing resonance effects that increase the maximum height of the sloshing wave favouring the leakage of the liquid. Results show that the rocking acceleration of a rigid tank under earthquakes cannot be neglected in any cases.

圆形储罐是工业和核电站中电镀的结构，通常用于储存水、石油和天然气。在地震区，它们必须设计得很好，以避免由于可能的内容泄漏而造成的环境和经济灾难。在代码中，分析液舱系统的基本模型在水平加速度下由两个部分组成（脉冲和对流），因此几乎忽略了摇摆运动和上升。本文对刚性无锚储罐进行了研究，考虑了摇摆运动和上升所产生的附加压力。为此，从动态和静态两方面进行了精确的分析和参数化分析。近似解提供了更高的安全值，以补偿被忽略的摇摆运动。所得到的压力有助于很好地估计由于上升而引起的底板环向应力。对于相对较高的旋转，晃动和摇摆之间的耦合相互作用可能产生共振效应，从而增加晃动波的最大高度，有利于液体的泄漏。结果表明，刚性储罐在地震作用下的振动加速度在任何情况下都不可忽视。

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引用次数: 0

Investigation of mixed mode I/III fracture of 14MoV6-3 power plant steel using 3D-digital image correlation 14MoV6-3电厂钢I/III型混合断口的三维数字图像相关研究

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-10-10 DOI: 10.1016/j.ijpvp.2025.105681

Benard Kipsang , Behzad Vasheghani Farahani , Krzysztof Wacławiak , Wim De Waele

Considering the complex stresses in power boiler piping and the oblique orientation of cracks, mixed mode I/III loading plays a significant role in crack propagation during service. This research investigates the fracture characteristics of 14MoV6-3 power plant steel under mixed mode I/III loading. Experimental techniques are implemented using the 3D full-field Digital Image correlation (DIC) tool to measure the Crack Tip Opening Displacement (CTOD) in quasi-static loading conditions. Single Edge Notch Tension (SENT) specimens are used to assess tilted notches' effect on their tearing resistance. Three different notch angles 0⁰, 22.5⁰, and 45° are assessed. The contribution of mode III CTOD to crack opening is quantified. In all cases, it can be inferred that the fracture toughness under mixed mode I/III loading is slightly higher than under mode I loading. Numerically, the problem is solved using the finite element method, FEM, formulation extended to the fracture mechanics theory in which J-Integral is acquired and compared to the experimental solution, a good agreement was verified. The mode-I Stress Intensity Factor (SIF) is calculated from the DIC data using the overdeterministic algorithm to obtain an alternative solution and assess the experimental campaign's robustness. Therefore, a comprehensive comparison is drawn amongst all acquired results. Furthermore, the fracture resistance (R-curves) of the different notch angles is experimentally evaluated.

考虑到动力锅炉管道的复杂应力和裂缝的倾斜方向，I/III混合模式加载对使用过程中的裂纹扩展有重要影响。本文研究了14MoV6-3电厂钢在I/III混合模式加载下的断裂特性。利用三维全场数字图像相关（DIC）工具实现了准静态加载条件下裂纹尖端张开位移（CTOD）的实验技术。采用单边缘缺口拉伸（SENT）试样来评估倾斜缺口对其抗撕裂性的影响。评估三种不同的缺口角度00、22.50和45°。量化了III型CTOD对裂纹张开的贡献。在所有情况下，可以推断I/III混合模式加载下的断裂韧性略高于I模式加载。数值上，将有限元方法推广到断裂力学理论中，求出j积分，并与实验解进行比较，结果吻合较好。i型应力强度因子（SIF）是使用超确定性算法从DIC数据中计算出来的，以获得替代解决方案并评估实验活动的鲁棒性。因此，对所有获得的结果进行全面的比较。在此基础上，对不同缺口角度的断裂抗力（r曲线）进行了实验评估。

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引用次数: 0

Effect of installation deviation on the natural characteristics of hydraulic L-shaped pipelines: Simulation and experimental study 安装偏差对l型液压管道自然特性的影响：仿真与实验研究

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-10-09 DOI: 10.1016/j.ijpvp.2025.105680

Chengbo Wang , Xumin Guo , Longfei Chi , Guoxiong An , Tianyu Zhao

The dynamic research of hydraulic pipelines has received widespread attention. The pipelines laid outside the aero-engine inevitably have assembly deviations, which may affect the vibration state of the pipelines. However, fluid-coupled modes analysis of pipelines considering installation deviations is very limited. Given this situation, this paper proposes a hydraulic pipeline dynamic model considering installation deviation based on Timoshenko beam theory and the incremental analysis method. The equivalence of the fluid is achieved through the addition of the stiffness matrix and damping matrix, and the installation deviation is characterized by the initial displacement matrix. A fluid-coupled modal analysis of the hydraulic pipeline with installation deviations is conducted based on the established model. The accuracy of the pipeline model is validated through literature and modal experiments on pipelines with installation deviations. The natural frequencies of the L pipeline under the combined effects of flow velocity, pressure, and installation deviations are analyzed. The results show that the natural frequency of hydraulic pipelines with installation deviation decreases with the increase of fluid velocity and pressure, and this change dominates, while the impact of installation deviation on the natural frequency of hydraulic pipelines is relatively weak. Axial installation deviations have a more pronounced effect on L-shaped pipelines compared to lateral deviations. Specifically, as the axial tensile installation deviation increases, the natural frequency of the pipeline also rises, and this law changes with the change of boundary conditions. This study can provide potential technical support and theoretical guidance for pipeline dynamics analysis and fault diagnosis with installation deviation in engineering.

液压管道的动力学研究受到了广泛的关注。航空发动机外置管道不可避免地存在装配偏差，从而影响管道的振动状态。然而，考虑安装偏差的管道流耦合模态分析非常有限。针对这种情况，本文基于Timoshenko梁理论和增量分析方法，提出了考虑安装偏差的液压管道动力学模型。流体的等效性通过刚度矩阵和阻尼矩阵的相加来实现，安装偏差用初始位移矩阵来表征。基于所建立的模型，对存在安装偏差的液压管路进行了流体耦合模态分析。通过文献和存在安装偏差的管道模态实验，验证了该管道模型的准确性。分析了L型管道在流速、压力和安装偏差共同作用下的固有频率。结果表明：安装偏差时液压管路的固有频率随流体速度和压力的增加而降低，且这种变化占主导地位，而安装偏差对液压管路固有频率的影响相对较弱。与横向安装偏差相比，轴向安装偏差对l型管道的影响更为明显。具体而言，随着轴向拉伸安装偏差的增大，管道的固有频率也随之升高，且该规律随边界条件的变化而变化。该研究可为工程中管道动力学分析和安装偏差故障诊断提供潜在的技术支持和理论指导。

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引用次数: 0

Failure investigation of the inconel 783 alloy bolt used in an ultra-supercritical power plant 某超超临界电厂用铬镍铁合金螺栓失效研究

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-10-10 DOI: 10.1016/j.ijpvp.2025.105676

Haiyue Pang , Qu Liu , Zhipeng Cai , Kejian Li

This study investigates the failure of an Inconel 783 alloy bolt that fractured during service in a medium-pressure control valve of an ultra-supercritical power unit. The failure mechanism was analyzed through fractographic observation, metallographic examination, and finite element analysis. The results indicate that the bolt failed via sudden fracture initiated by fatigue crack propagation. The failure process involved three stages: (1) fatigue crack initiation and growth from a surface scratch to a depth of approximately 1 mm; (2) subsequent crack extension dominated by stress-accelerated grain boundary oxidation (SAGBO); and (3) final fracture when the crack reached a critical length of about 15 mm. Two primary contributing factors were identified. First, improper heat treatment during manufacturing resulted in an insufficient precipitation of secondary β phase along the grain boundaries, which significantly reduced the material's resistance to SAGBO. Second, a pronounced negative creep phenomenon was observed, which was attributed to the incomplete precipitation of the γ′ strengthening phase in the as-received material. This negative creep led to an abnormal increase in the actual service stress by approximately 22.3 %, further accelerating both fatigue crack initiation and SAGBO-driven crack growth. This work provides a technical reference for the failure prevention of Inconel 783 bolts under high-temperature and high-stress service conditions.

本文研究了超超临界机组中压控制阀中使用的因康耐尔783合金螺栓在使用过程中断裂的故障。通过断口观察、金相检验和有限元分析，分析了断裂机理。结果表明，锚杆的破坏是由疲劳裂纹扩展引起的突然断裂。破坏过程分为三个阶段：(1)疲劳裂纹的萌生和扩展，从表面划痕到深度约1 mm；(2)以应力加速晶界氧化（SAGBO）为主的后续裂纹扩展；(3)裂纹达到15mm左右的临界长度时最终断裂。确定了两个主要的影响因素。首先，制造过程中热处理不当导致二次β相沿晶界析出不足，这大大降低了材料的抗SAGBO性能。其次，观察到明显的负蠕变现象，这是由于接收材料中γ′强化相的不完全析出所致。这种负蠕变导致实际使用应力异常增加了约22.3%，进一步加速了疲劳裂纹的萌生和sagbo驱动的裂纹扩展。为高温高应力工况下预防Inconel 783螺栓失效提供了技术参考。

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引用次数: 0

Study on the fracture failure mechanism of full-scale pipeline girth welds with central/interfacial crack 含中心/界面裂纹的全尺寸管道环焊缝断裂失效机理研究

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-09-17 DOI: 10.1016/j.ijpvp.2025.105655

Yinhui Zhang , Fuxiang Wang , Zhiyang Lv , Tieyao Zhang , Jian Shuai

The fracture failure of oil and gas pipelines is an important form, especially the fracture problem of girth welds has become the current research focus. This paper employs a material damage model and finite element analysis to study the fracture failure mechanism of the full-scale pipeline welded joints with central/interfacial crack. According to the findings, the fracture mechanism of the interfacial crack is more complicated than previously thought. Under conditions of a large weld matching coefficient, the interfacial crack in the full-scale overmatched girth welds deflects into the heat-affected zone (HAZ) after reaching a specific length. Significant plastic strain zones develop from the crack front to the right-side pipeline's inner side after the crack has grown, but high stress triaxiality zones primarily disperse in the HAZ before the crack tip. In the case of undermatched full-scale pipeline girth welds, the growth of the interfacial crack does not deflect. A large plastic strain region is formed from the crack front to the inner side of the left-side HAZ, and high stress triaxiality zones distribute along the interface within the weld metal (WM). Under varying weld strength matching conditions, elevating the matching coefficient consistently enhances crack growth resistance while correspondingly diminishing the driving force. Decreasing the weld matching coefficient, enhancing the base metal (BM) strain hardening exponent, intensifying HAZ softening, or applying internal pressure all collectively reduce the strain-bearing capacity of pipeline girth welds. Under identical conditions, the deformation resistance of pipelines with the interfacial crack is significantly lower than that of pipelines containing the central crack in girth welds. The interfacial crack shall be analyzed separately from the non-interfacial weld crack to avoid pipeline failure caused by insufficient understanding of its danger level.

油气管道断裂失效是一种重要形式，尤其是环焊缝断裂问题已成为当前研究的热点。本文采用材料损伤模型和有限元分析方法，研究了含中心/界面裂纹的全尺寸管道焊接接头断裂失效机理。根据研究结果，界面裂纹的断裂机制比以前认为的要复杂得多。在焊缝匹配系数较大的情况下，全尺寸过匹配环焊缝的界面裂纹在达到一定长度后会向热影响区偏转。裂纹扩展后，从裂纹前缘到右侧管道内侧出现了显著的塑性应变区，但高应力三轴性区主要分散在裂纹尖端之前的热影响区。在不匹配全尺寸管道环焊缝的情况下，界面裂纹的扩展不会偏转。从裂纹前缘到左侧热影响区内侧形成了较大的塑性应变区，焊缝金属内部沿界面分布着高应力三轴性区。在不同的焊缝强度匹配条件下，匹配系数的增大均能提高抗裂纹扩展能力，但相应的减小了抗裂纹扩展的驱动力。降低焊缝匹配系数、提高母材（BM）应变硬化指数、强化热影响区软化或施加内压均可降低管道环焊缝的应变承载能力。在相同条件下，含界面裂纹管道的变形抗力明显低于环焊缝含中心裂纹管道的变形抗力。界面裂纹应与非界面焊缝裂纹分开分析，避免因对其危险程度认识不足而造成管道失效。

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引用次数: 0

The calibration of Hill48 anisotropic yield criterion for circular thin-walled tube bending 圆薄壁管弯曲Hill48各向异性屈服准则的标定

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-09-26 DOI: 10.1016/j.ijpvp.2025.105668

Xu Han , Zhi-Ping Guan , Jing-Ru Liu , Bao-Yan Zhao , Lei Gong , Yong Bi

Hill48 yield criterion has advantages in characterizing the anisotropy behavior of tube materials. In the study, a stress-based Hill48 yield criterion is presented specifically for circular tube bending, based on yield stresses rather than R-values. Its calibration is developed involving two uniaxial tensile tests along axial/circumferential direction, and one plane strain tensile test along axial direction of circular tube specimen, which match with the uniaxial tension states in 0° and 90° angles to the axial direction and the biaxial tension state, respectively, for identification of F, G and H values, and one torsion test for identification of N value. The FE models of rotary draw bending of SS 304 circular tube are established considering the stress-based Hill48 yield criterion. The simulation of tube bending indicates the stress-based Hill48 yield criterion can significantly improve the prediction accuracy of cross-section deformation in comparison with the strain-based Hill48 yield criterion and the Mises yield criterion. Compared with the traditional strain-based Hill48 yield criterion, the stress-based Hill48 yield criterion is more suitable for characterizing the bending behavior of circular tubes, which is primarily induced by flow stresses instead of plastic flow. Due to the compatibility of stress components, the stress-based Hill48 yield criterion is more suitable for modeling the anisotropic properties in circular tube bending while the testing method involving tube bulging is related to the plastic behavior in tube hydroforming.

Hill48屈服准则在表征管状材料的各向异性行为方面具有优势。在研究中，专门针对圆管弯曲提出了基于应力的Hill48屈服准则，该准则基于屈服应力而不是r值。其标定涉及两次沿轴向/周向的单轴拉伸试验和一次沿轴向的平面应变拉伸试验，分别与轴向0°和90°角的单轴拉伸状态和双轴拉伸状态相匹配，用于识别F、G和H值，以及一次用于识别N值的扭转试验。采用基于应力的Hill48屈服准则，建立了ss304圆管旋转拉伸弯曲的有限元模型。管材弯曲模拟结果表明，与基于应变的Hill48屈服准则和Mises屈服准则相比，基于应力的Hill48屈服准则能显著提高管材截面变形的预测精度。与传统的基于应变的Hill48屈服准则相比，基于应力的Hill48屈服准则更适合于描述圆形管的弯曲行为，圆形管的弯曲行为主要是由流动应力而不是塑性流动引起的。由于应力分量的相容性，基于应力的Hill48屈服准则更适合于模拟圆管弯曲的各向异性，而涉及管胀形的试验方法则与管液压成形的塑性行为有关。

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引用次数: 0

A data fusion and causal method for estimating pipeline strain resulting from ground movement 一种估算地面移动引起的管道应变的数据融合和因果法

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2026-02-01 Epub Date: 2025-11-13 DOI: 10.1016/j.ijpvp.2025.105704

Colin A. Schell , Ernest Lever , Dhruva Rayasam , Katrina M. Groth

Pipelines are the primary transportation method for natural gas and oil in the United States making them critical infrastructure to maintain. However, ground movement hazards, such as landslides and ground subsidence, can deform pipelines and potentially lead to the release of hazardous materials. Longitudinal strain-based limit states are commonly used to manage pipeline integrity in the presence of these ground movement hazards. However, most available methods for predicting strain demand, the strain induced on the pipeline by its environment, are only applicable in specific ground movement scenarios and cannot synthesize complementary data sources. This makes it challenging to compare ground movement hazards where the movement or strain information is collected by different monitoring techniques. Thus, it is difficult to identify locations with high strain demand in a comparable manner making it difficult for pipeline companies to protect their pipeline network from ground movement hazards.

To close these gaps, this research paper presents a new causal information fusion model for assessing strain demand in a variety of ground movement scenarios. The model is capable of using multiple sources of pipeline and ground monitoring data to probabilistically assess pipeline strain demand. The model was applied to two case studies with different ground movement scenarios and available data to demonstrate its information fusion capabilities. Despite data quality challenges, the model can identify areas of high longitudinal strain indicating a higher potential for failure. When used in a pipeline integrity model, the proposed strain demand model could identify at-risk pipeline segments that may require remediation or further analysis and promote a quicker response to ground movement hazards overall.

在美国，管道是天然气和石油的主要运输方式，因此是需要维护的关键基础设施。然而，地面移动的危险，如滑坡和地面沉降，可能会使管道变形，并可能导致有害物质的释放。基于纵向应变的极限状态通常用于管理存在这些地面移动危险的管道完整性。然而，大多数现有的预测应变需求的方法，即由其环境对管道产生的应变，仅适用于特定的地面移动场景，无法综合互补的数据源。这使得比较由不同监测技术收集的运动或应变信息的地面运动危害具有挑战性。因此，很难以可比的方式确定高应变需求的位置，这使得管道公司难以保护其管网免受地面移动危害。为了弥补这些空白，本文提出了一种新的因果信息融合模型，用于评估各种地面运动情景下的应变需求。该模型能够利用多种管道和地面监测数据源对管道应变需求进行概率评估。将该模型应用于两个具有不同地面移动场景和可用数据的案例研究，以验证其信息融合能力。尽管数据质量存在挑战，但该模型可以识别出高纵向应变区域，这表明故障的可能性更高。当用于管道完整性模型时，建议的应变需求模型可以识别可能需要修复或进一步分析的风险管道段，并促进对地面移动危害的更快响应。

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