International Journal of Pressure Vessels and Piping最新文献_第10页

Stress intensity factor analysis for mixed-mode fracture behavior of pipes with multiple inclined surface cracks considering crack interference effects 考虑裂纹干涉效应的多斜面裂纹管道混合模式断裂行为应力强度因子分析

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-09-07 DOI: 10.1016/j.ijpvp.2025.105651

Ziya Peng , Shibo Yang , Kehuan Wang , Jiangchao Wang , Yuelin Song

The objective of study is to investigate the mixed-mode (modes I, II and III) fracture behavior and crack interference mechanisms (i.e. strengthening interference, shielding interference and no interference) of pipes with multiple inclined surface cracks. A three-dimensional (3D) model established by FRANC 3D with ABAQUS is used to conduct the fatigue analysis under tension load. The influencing factors, including relative distance, circumferential angle, relative crack angle and crack size, are discussed through quantitative analyses. The interference mechanism between major crack and interference crack is also analyzed using the stress and displacement evolutions, normalized stress intensity factors (SIFs) distribution, etc. The results show that internal interference surface crack (IISC) generally accelerates crack growth at the deepest point of major crack when the relative depth of major crack is large, while it may initially exert an inhibitory effect at the small relative depth. Meanwhile, this interference typically inhibits crack growth at the surface point of major crack. Additionally, external interference surface crack (EISC) can inhibit crack growth at the surface and deepest points of major crack. The crack profile evolution analysis and the proposed interference factor can well reflect the multiple fracture mode interference laws between the cracks in pipes. Finally, a series of formulas are developed to evaluate the normalized crack driving force of major crack considering the effect of interference crack under mixed-mode conditions.

研究的目的是研究具有多个倾斜表面裂纹的管道的混合模式（I、II和III模式）断裂行为和裂纹干涉机制（即强化干涉、屏蔽干涉和不干涉）。采用franc3d软件和ABAQUS软件建立三维模型，进行拉伸载荷下的疲劳分析。通过定量分析，讨论了相对距离、周向角、相对裂纹角和裂纹尺寸等影响因素。利用应力位移演化、归一化应力强度因子（SIFs）分布等分析了主裂纹与干涉裂纹之间的干涉机理。结果表明：当主裂纹相对深度较大时，内干涉表面裂纹（IISC）一般在主裂纹最深处加速裂纹扩展，而在相对深度较小时，IISC可能会起抑制作用；同时，这种干扰通常会抑制主裂纹表面点的裂纹扩展。此外，外干涉表面裂纹（EISC）在主裂纹的表面和最深处抑制裂纹的扩展。裂纹轮廓演化分析及提出的干涉系数能较好地反映管道裂纹间的多断裂模式干涉规律。最后，建立了混合模态下考虑干涉裂纹影响的主裂纹归一化裂纹驱动力的计算公式。

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引用次数: 0

Composition, microstructure and property evolution of diverse micro-zones of dissimilar weldment to various service environments in ultra-supercritical unit 超超临界机组不同使用环境下异种焊件不同微区组成、显微组织及性能演变

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-09-06 DOI: 10.1016/j.ijpvp.2025.105653

Yanyan Huang , Zizhen Yang , Jie Yang , Siyuan Zhang , Lingling Fan , Xuguang An , Lin Yang , Jianping Yang , Yang Guo

This study investigates the deterioration response of diverse micro-zones of dissimilar martensitic heat-resistant steel (F92/Co3W2) weldment to various service environments in ultra-supercritical (USC) thermal power unit, with respect to composition, microstructure and property evolution. The results indicate that temperature has the most significant effect on the corrosion damage rate, with severe corrosion intensification at 850 °C, where mass gain far exceeds that at 620 °C. The corrosion layer thickness shows a positive correlation with temperature, stress, or time increment, with temperature exhibiting a much greater impact than the other two factors. The F92 zone consistently exhibits more severe damage behavior than the weld metal and Co3W2 zones for any tested corrosion environment. It is found that martensitic heat-resistant steel exhibits a uniform damage (corrosion) propagation mode, with small cracks that lack obvious directionality, while Ni alloy 4169 shows a localized deepening damage pattern along grain boundaries perpendicular to the stress direction. Different welding zones demonstrate various local mechanical properties obtained by nanoindentation testing, which are analyzed based on the evolution of the microstructure, such as precipitates, dislocation density, etc., resulting from changes in service condition. Moreover, the Co3W2 zone demonstrates superior resistance to elastic strain damage and plastic deformation compared to the F92 and weld metal zones. This study provides a theoretical basis for understanding the damage mechanism with respect to microstructure and mechanical property evolution of dissimilar welded joints in elevated temperature service environments of ultra-supercritical units.

研究了不同马氏体耐热钢（F92/Co3W2）焊接件在超超临界（USC）火电机组不同使用环境下不同微区劣化响应，包括成分、显微组织和性能演变。结果表明，温度对腐蚀损伤速率的影响最为显著，在850℃时腐蚀加剧严重，质量增益远远超过620℃时。腐蚀层厚度与温度、应力和时间增量呈正相关，温度对腐蚀层厚度的影响大于其他两个因素。在任何测试的腐蚀环境中，F92区域始终表现出比焊缝金属和Co3W2区域更严重的破坏行为。结果表明，马氏体耐热钢表现出均匀的损伤（腐蚀）扩展模式，裂纹较小，缺乏明显的方向性，而Ni合金4169则表现出垂直于应力方向的沿晶界局部加深的损伤模式。通过纳米压痕测试，不同的焊接区表现出不同的局部力学性能，分析了使用条件变化导致的微观组织演变，如析出相、位错密度等。此外，与F92和焊缝金属区相比，Co3W2区具有更好的抗弹性应变损伤和塑性变形能力。本研究为了解超超临界机组高温服役环境下异种焊接接头的显微组织和力学性能演变的损伤机理提供了理论依据。

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引用次数: 0

Investigation of the layup design in filament-wound GFRP composite pipes based on pseudo-ductility 基于拟延性的纤维缠绕玻璃钢复合管道铺层设计研究

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-09-05 DOI: 10.1016/j.ijpvp.2025.105652

Zhouyue Gu, Hongfeng Li, Yang Liu, Mingxuan Li, Xiaolei Zhu, Xiaofeng Lu

Filament-wound (FW) glass fiber-reinforced polymer (GFRP) composite pipe is widely used in various fields, but its spread is restricted by unfavorable brittle and catastrophic failure. It has become a research hotspot to establish a layup design method for sufficient failure warning through large deformation that can be visually inspected. In this paper, the finite element (FE) model of the FW pipe was established using ABAQUS software, and the model’s reliability was validated through hydraulic burst experiments, with the simulated failure modes closely aligning with experimental results. On this base, the influence factors of pseudo-ductility in 3D curved surfaces were investigated. The results showed that winding angles, layer thickness ratio, and ±74° layer content greatly influence the pseudo-ductility in FW pipes. It can be concluded that adding appropriate pseudo-ductile angle layers, like ±74° layer, can effectively increase the hoop strain before failure occurs.

纤维缠绕玻璃纤维增强聚合物（GFRP）复合管广泛应用于各个领域，但其不利的脆性和突变破坏限制了其推广。如何建立一种通过可直观检测的大变形进行充分失效预警的铺层设计方法已成为研究热点。本文利用ABAQUS软件建立了FW管道的有限元模型，并通过水力爆破试验验证了模型的可靠性，模拟的破坏模式与试验结果吻合较好。在此基础上，研究了三维曲面拟延性的影响因素。结果表明，缠绕角、层厚比和±74°层含量对FW管的伪延性影响较大。结果表明，在破坏前添加适当的伪延性角层，如±74°层，可有效提高环向应变。

引用次数: 0

Experimentally Informed GTN model to predict ductile fracture in API X70 steel and weld using finite element analysis 利用有限元分析，通过实验验证GTN模型预测API X70钢和焊缝的韧性断裂

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-09-03 DOI: 10.1016/j.ijpvp.2025.105633

Aditya Kumar , Harpreet Singh , Sandip Haldar , Rahul Chhibber

The finite element analysis with Gurson-Tvergaard-Needleman (GTN) damage model has been performed to investigate ductile fracture of X70 pipeline steel and weld. Uniaxial tensile tests and single edge notch bend tests with

a_{o} / W = 0.50

and

a_{o} / W = 0.25

in-plane constraints were tested. The inverse approach of GTN parameter identification was applied. The SENB samples were prepared with precise electric-discharge machining. Digital image correlation was used for crack mouth opening displacement. The calibrated GTN parameters with critical element size were validated on

a_{o} / W = 0.25

and flat-notch tensile test results. The pop-in behavior of weld SENB was simulated by assigning brittle material properties in the fracture process zone at a definite interval. The modified fracture process zone combined with the GTN model has shown better agreement with load-CMOD results. The simulation of single edge notch bend tests of EDM cut crack and sharp crack shows that initial fracture toughness increases for EDM cut crack.

采用Gurson-Tvergaard-Needleman （GTN）损伤模型对X70管线钢及其焊缝的韧性断裂进行了有限元分析。在ao/W=0.50和ao/W=0.25平面约束条件下进行单轴拉伸试验和单刃缺口弯曲试验。采用了GTN参数辨识的逆方法。采用精密电火花加工法制备了SENB样品。裂缝张开位移采用数字图像相关方法。校正后的临界元件尺寸GTN参数在ao/W=0.25和平缺口拉伸试验结果上进行验证。通过指定断裂过程区内的脆性材料特性，模拟了焊缝SENB的弹出行为。修正后的断裂过程带结合GTN模型与load-CMOD结果吻合较好。电火花切割裂纹和锐裂纹的单刃缺口弯曲模拟试验表明，电火花切割裂纹的初始断裂韧性增加。

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引用次数: 0

Failure mechanisms transition of hydrogenation reactor: from creep-fatigue to creep-ratcheting 加氢反应器失效机理转变：从蠕变-疲劳到蠕变-棘轮

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-09-02 DOI: 10.1016/j.ijpvp.2025.105634

Xiaoxiang Bai , Xaoxiao Wang , Haofeng Chen , Fuzhen Xuan , Guodong Jia

The hydrogenation reactor is one of the crucial pressure vessels in the petroleum refining and coal chemical industry, which is exposed to the complicated combinations of' elevated temperature environments, high-pressure conditions, and long creep dwell during service, resulting in the interaction between low-cycle fatigue (LCF) and creep. In this study, the extended Direct Steady Cyclic Analysis (eDSCA) procedure under the Linear Matching Method Framework (LMMF) is utilised to perform an in-depth analysis of the structural creep-fatigue behaviours of the hydrogenation reactors. The results indicate that as the stress-strain hysteresis curves evolve from closed to open states, there emerges a transition in the failure mechanism of the hydrogenation reactor from creep-fatigue to creep-ratcheting. Moreover, with increasing mechanical load and prolonged creep dwell time at loading points within the cyclic plastic zone, the location of maximum creep strain shifts from the outer wall to the inner wall of the nozzle, eventually migrating toward the junction between the nozzle and the vessel. The findings of this study facilitate understanding of the creep-fatigue failure in terms of pressure vessels and, hence, improve the accuracy of life prediction for hydrogenation reactors.

加氢反应器是石油炼制和煤化工工业中重要的压力容器之一，在使用过程中受到高温环境、高压条件和长时间蠕变停留的复杂组合，导致低周疲劳（LCF）与蠕变相互作用。在本研究中，采用线性匹配方法框架（LMMF）下扩展的直接稳定循环分析（eDSCA）程序对加氢反应器的结构蠕变疲劳行为进行了深入分析。结果表明：随着应力-应变迟滞曲线由闭合状态向开启状态演化，加氢反应器的失效机制出现了从蠕变-疲劳到蠕变-棘轮的转变；此外，随着机械载荷的增大和循环塑性区内各加载点蠕变停留时间的延长，最大蠕变应变的位置由喷嘴的外壁向内壁移动，最终向喷嘴与容器的结合处迁移。本研究结果有助于对压力容器蠕变疲劳失效的理解，从而提高加氢反应器寿命预测的准确性。

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引用次数: 0

New design method for cylindrical pressure-tight metallic hulls with hemispherical glass viewports 半球形玻璃观景口圆柱形耐压金属船体的新设计方法

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-08-28 DOI: 10.1016/j.ijpvp.2025.105628

Yucheng Yang , Limin Gao , Guojun Wu , Yafeng Wu , Bo Liu , Geyang Hao

The hemispherical glass viewport serves as an indispensable critical component in deep-sea wide-field optical detection systems. However, the inherent brittleness and low tensile strength of glass increase the risk of damage or fracture when these viewports are directly connected to metallic cylindrical hulls under high hydrostatic pressure. To address this challenge, this paper proposes a novel radial dual-sliding pressure-resistant sealing configuration, based on elastic half-space contact theory. The core design principle focuses on minimizing the maximum tensile stress in the viewport by reducing the interfacial indentation depth. Through nonlinear finite element analysis (FEA), we compare the sealing and pressure resistance performance of this new configuration against the conventional direct-sliding design. Furthermore, for the proposed dual-sliding configuration, we conduct comprehensive parametric sensitivity analysis—including friction coefficients, ellipticity deviation, and demolding striations—on the viewport’s pressure resistance. Identifying the friction coefficient as the critical parameter, we expand its testing conditions to cover the simulation-optimized range, followed by full-scale hydrostatic pressure testing of the assembly. Comparative studies demonstrate that the proposed configuration reduces maximum tensile and compressive stress in the hemispherical viewport by 13.9% and 15% respectively compared to the conventional design, achieving operational capability at 6000 m depth. These findings provide an innovative structural solution for deep-sea optical equipment viewports, exhibiting significant engineering application value.

半球形玻璃视口是深海宽视场光学探测系统中不可缺少的关键部件。然而，玻璃固有的脆性和低抗拉强度增加了损坏或断裂的风险，当这些视口直接连接到高静水压力下的金属圆柱形船体。为了解决这一问题，本文提出了一种基于弹性半空间接触理论的径向双滑动耐压密封结构。核心设计原则侧重于通过减少界面压痕深度来最小化视口中的最大拉伸应力。通过非线性有限元分析（FEA），我们比较了这种新结构与传统直接滑动设计的密封和耐压性能。此外，对于所提出的双滑动结构，我们对视口的耐压性进行了全面的参数敏感性分析，包括摩擦系数、椭圆度偏差和脱模条纹。以摩擦系数为关键参数，将其测试条件扩展到仿真优化范围，然后对总成进行全尺寸静水压力测试。对比研究表明，与传统设计相比，该设计将半球形视口的最大拉应力和最大压应力分别降低了13.9%和15%，实现了在6000米深度下的作业能力。这些研究结果为深海光学设备视口提供了一种创新的结构解决方案，具有重要的工程应用价值。

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引用次数: 0

Ensemble machine learning model for prediction of inner welding defects in orbital GTAW (Gas Tungsten Arc Welding) process with monitored by multi-sensor system 基于多传感器监测的集成机器学习轨道气体钨极保护焊内焊缺陷预测模型

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-08-27 DOI: 10.1016/j.ijpvp.2025.105632

YuHyeong Jeong , Yunfeng Wang , Van Doi Truong , Seungbeom Jang , Jangwook Lee , Jonghun Yoon

This study proposes a novel real-time defect detection system based on multi-sensor fusion, integrating an infrared (IR) camera, a laser line scanner, and an acoustic sensor to monitor welding conditions during the GTAW process for carbon steel and stainless steel. Sensor data are processed to extract thermal, geometrical, and acoustic features, which are used to train two sub–machine learning models based on artificial neural networks (ANN) for detecting porosity and lack of fusion defects. The sub-model outputs are combined into an ensemble model achieving an average accuracy of 94.3 % in K-fold cross validation, but this restricts applicability to carbon/stainless steel welds unless retrained. The system can predict defects within approximately 10 s after welding, reducing inspection time by about 30 times compared to conventional X-ray methods, enabling substantial improvements in industrial process efficiency. The proposed approach offers a distinct advantage over prior single-sensor systems by combining complementary thermal, and acoustic sub-machine learning model into a unified predictive model, enabling not only defect detection but also accurate classification of defect types.

本研究提出了一种基于多传感器融合的新型实时缺陷检测系统，该系统集成了红外（IR）相机、激光线扫描仪和声学传感器，用于监测碳钢和不锈钢在GTAW过程中的焊接状况。对传感器数据进行处理，提取热、几何和声学特征，并将这些特征用于训练基于人工神经网络（ANN）的两个子机器学习模型，用于检测孔隙度和融合缺陷缺失。子模型输出组合成一个集成模型，在K-fold交叉验证中实现94.3%的平均精度，但这限制了对碳/不锈钢焊缝的适用性，除非重新训练。该系统可以在焊接后大约10秒内预测缺陷，与传统的x射线方法相比，检测时间减少了约30倍，从而大大提高了工业过程效率。该方法通过将互补的热学和声学子机器学习模型结合到统一的预测模型中，与先前的单传感器系统相比，具有明显的优势，不仅可以检测缺陷，还可以准确分类缺陷类型。

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引用次数: 0

Rubber-assisted tube piercing of aluminum: GTN-based simulation and experimental validation 橡胶辅助铝管穿孔：基于gtn的仿真与实验验证

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-08-26 DOI: 10.1016/j.ijpvp.2025.105631

Hamzeh Mamashli , Mahdi Gerdooei , Hasan Ghafourian Nosrati

This study presents the first combined experimental and numerical investigation into Rubber-Assisted Tube Piercing (RATP), a novel and largely unexplored manufacturing technique for seamless 6061 aluminum alloy tubes, offering a low-cost alternative to conventional methods. Experiments utilizing a specialized die and a polyurethane elastomeric tool successfully produced punched tubes of consistent quality. A key contribution of this work is the application and rigorous validation of the Gurson-Tvergaard-Needleman (GTN) damage model to predict ductile failure in this specific process. GTN parameters were calibrated using tensile test data and an inverse optimization approach. This dual approach not only validates the efficacy of RATP but also establishes a reliable GTN-based simulation framework, providing a powerful predictive tool for future process refinement. Field Emission Scanning Electron Microscopy (FESEM) images revealed a dimpled fracture zone with an average dimple size of 15 μm, confirming ductile failure consistent with GTN predictions. Unlike fluid-assisted methods, this technique sidesteps sealing challenges, enhancing its practicality and marking a significant step forward for precision engineering applications.

本研究首次对橡胶辅助管穿孔（RATP）进行了实验和数值研究，RATP是一种新型的、尚未开发的无缝6061铝合金管制造技术，为传统方法提供了一种低成本的替代方案。实验利用专用模具和聚氨酯弹性体工具成功地生产出质量一致的冲孔管。这项工作的一个关键贡献是应用并严格验证了Gurson-Tvergaard-Needleman （GTN）损伤模型来预测这一特定过程中的延性破坏。利用拉伸试验数据和逆优化方法对GTN参数进行了标定。这种双重方法不仅验证了RATP的有效性，而且建立了一个可靠的基于gtn的仿真框架，为未来的工艺改进提供了强大的预测工具。场发射扫描电镜（FESEM）图像显示了一个平均尺寸为15 μm的韧窝断裂区，证实了与GTN预测一致的韧性破坏。与流体辅助方法不同，该技术避开了密封挑战，提高了实用性，标志着精密工程应用向前迈出了重要一步。

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引用次数: 0

Finite element analysis and experimental validation of necking-spinning forming behavior for thin-walled double-nozzle gas cylinder liners 薄壁双喷嘴气瓶套颈旋压成形行为的有限元分析与实验验证

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-08-26 DOI: 10.1016/j.ijpvp.2025.105629

Haofei Yu , Yugui Li , Chen Wang , Wang Tian

The tube spinning process has been widely used to manufacture gas cylinder liners. To realize the integral forming of the inner liner of the thin-walled gas cylinder with double nozzles, we design a kind of unequal-thickness cylindrical piece as the inner liner blank and use the friction tool to shrink the neck of the end of the blank, to realize the integral forming of the inner liner of the thin-walled gas cylinder. This study presents a three-dimensional finite element model developed to analyze the influence of various dimensional parameters on the necking formation of gas cylinder blanks in the mouth area. The single-factor control method was used to derive optimal dimensional parameters that match actual requirements. The correctness of the model is verified through experiments, and the experimental results are in good agreement with the numerical simulation results, with the maximum thickness error within 8 %. Additionally, the stress distribution during necking is analyzed. The study revealed that the outer layer of the tube experiences compressive stress in three dimensions; the metal at the end primarily extends in the axial direction, with a minor thickening effect observed. The study also examines the impact of various process parameters on the thickness of the bottle mouth, as well as the equivalent strain and spinning force. The results show that with the increase in spinning temperature and spindle speed, the wall thickness of the tube end gradually decreases; the equivalent strain gradually increases. These results provide some guidance for manufacturing thin-walled gas cylinder liners.

旋管工艺已广泛应用于制造气瓶衬套。为实现双喷嘴薄壁气瓶内胆的整体成形，设计了一种不等厚圆柱件作为内胆毛坯，利用摩擦工具收缩毛坯末端颈部，实现了薄壁气瓶内胆的整体成形。本文建立了一个三维有限元模型，分析了不同尺寸参数对气瓶毛坯口部缩颈形成的影响。采用单因素控制法，求出符合实际要求的最优尺寸参数。通过实验验证了模型的正确性，实验结果与数值模拟结果吻合较好，最大厚度误差在8%以内。此外，还对颈缩过程中的应力分布进行了分析。研究表明，管材外层在三维空间中承受压应力；末端的金属主要在轴向延伸，观察到轻微的增厚效应。研究了各种工艺参数对瓶口厚度的影响，以及等效应变和旋压力的影响。结果表明：随着纺丝温度和主轴转速的升高，管端壁厚逐渐减小；等效应变逐渐增大。这些结果对薄壁气瓶衬套的制造具有一定的指导意义。

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引用次数: 0

Fatigue analysis and structural integrity of seamless carbon steel pipelines: Insights from surface imperfections to industry standards 碳钢无缝管道的疲劳分析和结构完整性：从表面缺陷到工业标准的见解

IF 3.5 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-08-26 DOI: 10.1016/j.ijpvp.2025.105625

Ahmed Reda , Ibrahim A. Sultan , Mohamed A. Shahin , Ali Karrech , Fokion Oikonomidis

The fatigue performance of seamless carbon steel pipelines is essential for maintaining structural integrity under cyclic loading. This study examines the effect of external surface imperfections on fatigue behavior, focusing on their role in crack initiation and propagation. Six full-scale fatigue tests were performed on seamless pipe specimens (276.1 mm outer diameter × 14.27 mm wall thickness), made of grade 450 carbon steel, compliant with DNV-ST-F101. Three specimens developed through-wall fatigue cracks that originated at external surface imperfections and propagated inwards. All three samples exceeded their target fatigue life, indicating that the imperfections were within allowable limits defined by the fatigue design curve. Metallurgical analysis showed that larger imperfections would likely have caused earlier crack initiation due to increased local stress. All pipes passed both mill and third-party inspection before testing. The results indicate that current inspection and quality control methods may not identify small imperfections that influence fatigue performance. A review of industry standards identified differences in surface defect limits, inspection techniques, and repair procedures. Proposed improvements include standardizing grinding limits, adopting automated non-destructive testing methods, and applying risk-based acceptance criteria. These measures aim to improve fatigue resistance and support consistent pipeline integrity management.

碳钢无缝管道的疲劳性能是保证管道在循环荷载作用下结构完整性的关键。本研究考察了外表面缺陷对疲劳行为的影响，重点研究了它们在裂纹萌生和扩展中的作用。采用DNV-ST-F101标准的450级碳钢无缝管试样（外径276.1 mm ×壁厚14.27 mm）进行了6次全尺寸疲劳试验。三个试件出现了从外表面缺陷开始并向内扩展的穿壁疲劳裂纹。三个试样均超过了目标疲劳寿命，表明缺陷在疲劳设计曲线规定的允许范围内。金相分析表明，由于局部应力的增加，较大的缺陷可能会导致更早的裂纹萌生。所有管道在测试前都通过了工厂和第三方的检验。结果表明，现有的检测和质量控制方法可能无法识别影响疲劳性能的小缺陷。对工业标准的回顾确定了表面缺陷限制、检查技术和修复程序的差异。建议的改进包括标准化磨削限制，采用自动化无损检测方法，以及应用基于风险的验收标准。这些措施旨在提高管道的抗疲劳性，支持管道完整性的一致性管理。

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引用次数: 0