International Journal of Pressure Vessels and Piping最新文献_第6页

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 : 2026-02-01 Epub 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

Buckling failure assessment of capsule-shaped subsea pressure shell containing defects 含缺陷的胶囊型海底压力壳屈曲破坏评估

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: 2025-10-28 DOI: 10.1016/j.ijpvp.2025.105689

Kai Yu , Xinhong Li , Ziyue Han , Xiuquan Liu , Yuanjiang Chang , Guoming Chen

Pressure shells are widely employed in subsea energy development. The manufacturing process and harsh marine environments may lead to the damage of shells, which may reduce the strength, and even lead to the instablility of subsea shell. This study aims to investigate the buckling behavior of capsule-shaped pressure shells with defects under hydrostatic pressure corresponding to a 2000 m water depth, with a focus on understanding the effects of single and multiple defects on the critical buckling load. A FE model of a capsule-shaped pressure shell is developed, and nonlinear buckling analyses are performed using the Riks method. Two types of defects are considered, i.e., initial geometric defects, e.g., out-of-roundness, and damage defects, e.g., corrosion or cracks. It is observed that the effect of initial geometric defects on critical buckling load is negligible. For single defects, corrosion area, corrosion depth, and crack length are dominant factors affecting buckling resistance. In cases of the double corrosion defects, the critical buckling load gradually recovers with increasing corrosion distance. For coupled crack-corrosion defects, most significant reduction in critical buckling load occurs when crack boundary just comes into contact with the corrosion pit. This study quantitatively investigates the coupled effects of defects on structural stability, and the outcomes can be applied for integrity management of capsule-shaped subsea pressure shells.

压力壳在海底能源开发中被广泛应用。制造过程和恶劣的海洋环境可能会导致壳体的损坏，从而降低强度，甚至导致海底壳体的不稳定。本研究旨在研究具有缺陷的胶囊形压力壳在2000 m水深静水压力下的屈曲行为，重点了解单个和多个缺陷对临界屈曲载荷的影响。建立了囊状压力壳的有限元模型，并采用Riks方法进行了非线性屈曲分析。考虑两种类型的缺陷，即初始几何缺陷，如圆度外，和损坏缺陷，如腐蚀或裂纹。结果表明，初始几何缺陷对临界屈曲载荷的影响可以忽略不计。对于单个缺陷，腐蚀面积、腐蚀深度和裂纹长度是影响抗屈曲性能的主要因素。在双腐蚀缺陷情况下，随着腐蚀距离的增加，临界屈曲载荷逐渐恢复。对于裂纹-腐蚀耦合缺陷，当裂纹边界刚好与腐蚀坑接触时，临界屈曲载荷的降低最为显著。本研究定量研究了缺陷对结构稳定性的耦合效应，研究结果可用于胶囊型海底压力壳的完整性管理。

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引用次数: 0

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 : 2026-02-01 Epub 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

Numerical and experimental analysis of welding parameters on residual stress in stainless steel 304L using ultrasonic methods 用超声方法对304L不锈钢焊接参数对残余应力的影响进行数值和实验分析

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: 2025-10-01 DOI: 10.1016/j.ijpvp.2025.105665

Amirhossein Rasfijani, Alireza Fadaei, Mohammadjavad Maghsoudi, Mehdi Ahmadi Najafabadi

Residual stresses generated by the welding process have a significant impact on the structural performance and service life of components. In this study, the effects of welding speed and current on longitudinal residual stresses in AISI 304L austenitic stainless steel (SS 304L) were investigated using both experimental and numerical approaches. Residual stresses were measured at a depth of 1.5 mm using longitudinal critically refracted (Lcr) ultrasonic waves, and the acoustoelastic coefficients of the base metal and weld metal were determined through uniaxial tensile testing. Numerical simulations of the welding process were conducted using ABAQUS software.

The results showed that residual stresses in the weld metal region are tensile and gradually shift toward compressive values with increasing distance from the weld center. Increasing the welding speed reduced the magnitude of residual stresses, whereas increasing the current led to an increase in residual stress levels. A comparison between the numerical simulation and experimental ultrasonic measurements revealed an average discrepancy of 27 MPa in the weld metal region (equivalent to 15 %) and 10 MPa in the base metal region (equivalent to 12 %). The maximum observed difference between the numerical and experimental results was 40 MPa at the weld line and 39 MPa in the base metal. The findings of this study demonstrate the effectiveness of combining ultrasonic testing and finite element simulation in analyzing and optimizing welding parameters and predicting residual stress distributions.

焊接过程中产生的残余应力对构件的结构性能和使用寿命有重大影响。采用实验和数值方法研究了焊接速度和电流对AISI 304L奥氏体不锈钢（SS 304L）纵向残余应力的影响。利用纵向临界折射（Lcr）超声波测量1.5 mm深度处的残余应力，并通过单轴拉伸测试确定母材和焊缝金属的声弹性系数。利用ABAQUS软件对焊接过程进行了数值模拟。结果表明：随着离焊缝中心距离的增加，焊缝金属区的残余应力以拉伸为主，逐渐向压缩方向转移；提高焊接速度可减小残余应力的大小，而增加焊接电流可增大残余应力的大小。数值模拟与实验超声测量结果的对比表明，焊缝金属区域的平均差异为27 MPa（相当于15%），母材区域的平均差异为10 MPa（相当于12%）。观察到的数值与实验结果之间的最大差异为焊缝处40 MPa，母材处39 MPa。研究结果验证了超声检测与有限元模拟相结合在分析和优化焊接参数以及预测残余应力分布方面的有效性。

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引用次数: 0

Assessment of AM70 high-strength steel processed via wire arc additive manufacturing for pressure vessel applications: Role of spray and pulsed arc 压力容器用电弧丝增材制造加工的AM70高强度钢的评估：喷射电弧和脉冲电弧的作用

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: 2025-09-30 DOI: 10.1016/j.ijpvp.2025.105671

Nikita Kumari, Kumar Kanishka, Bappa Acherjee

Achieving optimal mechanical performance in wire arc additive manufacturing (WAAM) of high-strength low-alloy (HSLA) steels is critical for the structural integrity of load-bearing and pressure-retaining components. This study compares the effects of high-capacity Spray Arc and voltage-controlled Pulsed Arc gas metal arc welding (GMAW) modes on the microstructure, residual stress distribution, and mechanical behavior of AM70 HSLA steel, an alloy formulated for enhanced arc stability and deoxidation. Comprehensive characterization using optical/electron microscopy, X-ray diffraction, mechanical testing, and fractography reveals distinct process–structure–property relationships. Pulsed Arc mode produces a refined acicular ferrite matrix with more uniform crystallite size and elemental homogeneity, leading to superior hardness (236–246 HV₅ vs. 223–235 HV₅), tensile strength (743–793 MPa vs. 687–710 MPa), and Charpy impact toughness (78.5–103 J vs. 59.3–78.2 J) compared to Spray Arc. Additionally, compressive residual stresses are more uniformly distributed under Pulsed Arc (−134 to −288 MPa), whereas Spray Arc introduces steeper gradients (−66 to −311 MPa), which could affect long-term structural performance. Although Spray Arc yields higher ductility (34.7–36.4 % vs. 29.1–32.9 %), Pulsed Arc offers a better balance of strength and toughness. Fractographic analysis confirms ductile failure modes in both cases, with finer dimple morphology observed in Pulsed Arc samples. These findings demonstrate the potential of Pulsed Arc WAAM with AM70 steel for manufacturing pressure-resilient and structurally reliable HSLA steel components.

在高强度低合金（HSLA）钢的电弧增材制造（WAAM）中实现最佳机械性能对承载和保压部件的结构完整性至关重要。本研究比较了大容量喷射电弧和电压控制脉冲电弧气体金属电弧焊（GMAW）模式对AM70 HSLA钢的显微组织、残余应力分布和力学行为的影响，AM70 HSLA钢是一种旨在增强电弧稳定性和脱氧的合金。利用光学/电子显微镜、x射线衍射、力学测试和断口学进行综合表征，揭示了不同的工艺-结构-性能关系。脉冲电弧模式产生了精细的针状铁素体基体，具有更均匀的晶粒尺寸和元素均匀性，与喷射电弧相比，具有更高的硬度（236-246 HV5 vs 223-235 HV5），抗拉强度（743-793 MPa vs 687-710 MPa）和Charpy冲击韧性（78.5-103 J vs 59.3-78.2 J）。此外，脉冲电弧（- 134至- 288 MPa）下的残余压应力分布更均匀，而喷雾电弧的残余压应力梯度更陡（- 66至- 311 MPa），可能会影响结构的长期性能。尽管喷射电弧具有更高的延展性（34.7 - 36.4% vs 29.1 - 32.9%），但脉冲电弧具有更好的强度和韧性平衡。断口分析证实了两种情况下的延性破坏模式，在脉冲电弧样品中观察到更细的韧窝形态。这些发现证明了脉冲电弧WAAM与AM70钢在制造抗压力和结构可靠的HSLA钢部件方面的潜力。

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引用次数: 0

Influence of laser power on weld formation, microstructure, and mechanical properties of Q235B steel joined by Laser-CMT hybrid welding process 激光功率对Q235B钢激光- cmt复合焊接成形、显微组织和力学性能的影响

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: 2025-10-24 DOI: 10.1016/j.ijpvp.2025.105688

Chen Liu , Yuanze Ma , Shuo Zhang , Changyun Li , Liqun Li , Jing Wang , Haoyue Li , Caiwang Tan , Hongbo Xia , Peng He

This study investigates the influence of laser power on weld formation, microstructure, and mechanical performance of 6-mm-thick Q235B steel joints fabricated by laser–CMT hybrid welding, combined with finite element thermal simulations. Results showed that increasing laser power decreased the cooling rate and promoted grain coarsening in all weld regions. The WZ consisted mainly of FA, FSP, FP, and bainite; the CGHAZ was dominated by Widmanstätten; while the FGHAZ contained refined ferrite–pearlite compared with the BM. EBSD analysis indicated that higher laser power enhanced texture intensity, while the fraction of HAGBs decreased from 69.8 % to 54.2 % and the KAM value dropped from 0.68° to 0.53°, reflecting a reduction in geometrically necessary dislocation density. At 5100 W, the joint exhibited optimal properties, with tensile strength of 730 MPa, elongation of 13.12 %, strength-ductility balance of 9.6 × 10³ MPa% and peak microhardness of 204.6 HV. These superior properties were attributed to defect-free weld morphology, moderate grain size, and a favorable balance of texture and grain boundary characteristics. Numerical simulations accurately reproduced thermal cycles and weld profiles, confirming that higher power extends cooling time and reduces cooling rate, thereby accelerating grain growth. Overall, appropriate heat input is essential for controlling microstructural evolution and achieving a superior strength–ductility synergy in laser–CMT hybrid welded joints.

结合有限元热模拟，研究了激光功率对6 mm厚Q235B钢激光- cmt复合焊接接头成形、显微组织和力学性能的影响。结果表明，激光功率的增加降低了冷却速度，促进了焊缝各区域晶粒的粗化。WZ主要由FA、FSP、FP和贝氏体组成；CGHAZ以Widmanstätten为主；而与BM相比，FGHAZ含有精炼的铁素体-珠光体。EBSD分析表明，较高的激光功率增强了织构强度，HAGBs的比例从69.8%下降到54.2%，KAM值从0.68°下降到0.53°，反映了几何必要位错密度的降低。在5100 W时，接头性能最佳，抗拉强度为730 MPa，伸长率为13.12%，强度-塑性平衡为9.6 × 103 MPa%，峰值显微硬度为204.6 HV。这些优异的性能归功于无缺陷的焊缝形貌、适中的晶粒尺寸以及织构和晶界特征的良好平衡。数值模拟精确地再现了热循环和焊缝轮廓，证实了更高的功率延长了冷却时间，降低了冷却速度，从而加速了晶粒的生长。总的来说，适当的热输入对于控制激光- cmt复合焊接接头的微观组织演变和实现良好的强度-塑性协同作用至关重要。

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引用次数: 0

Erosive wear behavior of FRP composite pipes under varying impingement angles, impact velocities and flow directions 不同冲击角、冲击速度和流动方向下FRP复合管材的冲蚀磨损行为

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: 2025-09-16 DOI: 10.1016/j.ijpvp.2025.105657

Seyit Mehmet Demet , Yusuf Kepir , Alper Gunoz , Harun Sepetcioglu , Mehmet Bagci , Memduh Kara

Fiber-reinforced polymer (FRP) composite pipes are emerging as superior alternatives in sectors such as oil and gas, chemical processing, and aerospace, owing to their high strength-to-weight ratio, corrosion resistance, and design flexibility; however, their long-term durability is susceptible to erosion wear when exposed to abrasive particles. This study experimentally investigates the solid particle erosion (SPE) behavior of filament-wound carbon (CFR/EP), glass (GFR/EP), and basalt (BFR/EP) fiber-reinforced epoxy pipes by ASTM G76-18. Tests were conducted under varied impingement angles (30°, 45°, 60°, 90°), flow directions (axial and radial), and particle velocities (28 and 34 m/s), using both erosion rate (ER) and volumetric material loss to assess performance. All composites demonstrated a semi-ductile erosion response, with degradation consistently peaking at a 45° impingement angle across all test conditions. An increase in particle velocity from 28 to 34 m/s induced a near two-fold escalation in ER. Among the materials, BFR/EP exhibited the highest erosion rates, whereas CFR/EP was the most resistant. Notably, ER values were consistently higher in the axial flow direction, exceeding radial values by 20–40 % under the most severe condition (45° at 34 m/s). Paradoxically, despite its lower ER, CFR/EP suffered greater volumetric material loss than GFR/EP, a discrepancy attributed to its significantly lower fiber volume fraction (42.4 %) compared to GFR/EP (68.9 %) and BFR/EP (59.7 %). These findings emphasize that both ER and volumetric loss are critical metrics for designing thin-walled pipes, thereby providing a crucial scientific basis for material selection in environments characterized by erosive, multi-directional flow.

纤维增强聚合物（FRP）复合管道由于其高强度重量比、耐腐蚀性和设计灵活性，正在成为石油和天然气、化学加工和航空航天等行业的优越替代品；然而，当暴露于磨料颗粒时，它们的长期耐久性容易受到侵蚀磨损。根据ASTM G76-18标准，研究了纤维缠绕碳纤维（CFR/EP）、玻璃（GFR/EP）和玄武岩（BFR/EP）纤维增强环氧树脂管道的固相颗粒侵蚀（SPE）行为。在不同的冲击角度（30°、45°、60°、90°）、流动方向（轴向和径向）以及颗粒速度（28和34 m/s）下进行了测试，使用侵蚀速率（ER）和材料体积损失来评估性能。所有复合材料都表现出半延性侵蚀响应，在所有测试条件下，在45°冲击角处，降解始终达到峰值。当粒子速度从28 m/s增加到34 m/s时，内压增加了近两倍。其中，BFR/EP材料的侵蚀速率最高，而CFR/EP材料的抗侵蚀能力最强。值得注意的是，轴向ER值一直较高，在最严重的情况下（45°，34 m/s）， ER值超过了径向值20 - 40%。矛盾的是，尽管其ER较低，CFR/EP比GFR/EP遭受更大的体积材料损失，这种差异归因于其纤维体积分数（42.4%）明显低于GFR/EP（68.9%）和BFR/EP（59.7%）。这些发现强调了内耗和体积损失是设计薄壁管道的关键指标，从而为在侵蚀多向流动环境中选择材料提供了重要的科学依据。

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引用次数: 0

Creep deformation behaviour of Grade 91 steel and its weld joints: A comparative study 91级钢及其焊缝蠕变行为的比较研究

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.2025.105678

Sumit Kumar Mohanty , Swarnalata Behera , Chandan Pandey , Krishna Guguloth

Grade 91 steel is widely used in the power plants for high-temperature applications. The tested specimens were fabricated from base metal and welded portions of Grade 91 steel for conducting tensile and creep tests in the temperature range of 575–675 °C and the stress range of 60–220 MPa, respectively. Understanding the creep deformation behaviour of Grade 91 steel up to rupture at different applied stresses is essential for ensuring reliable creep life and safe operation of the structural components of the power plants. The rupture times were obtained from 15 h to 5208 h for the samples of BM and WM. The stress dependence of minimum creep rate and rupture time is followed the Norton power law and the stress exponents were found in the range of 4.6–19.3 for the temperature range of 575–675 °C. The strain-hardening exponent is also substantially increased at 625 °C during tensile behaviour, which presence of MX precipitates. The higher stress exponent resulted at 575 °C and 625 °C, is mainly due to interaction of dislocations with the precipitates and grain boundaries. Furthermore, threshold stress analysis is performed for the base metal and weld joints to find the operating mechanism of creep. By considering threshold stresses, the true stress exponents are found to be approximately 4.6 and 5.1 within the temperature range of 575–675 °C, confirmed as dislocation climb is the rate-controlling mechanism of creep. The minimum creep rate and rupture time data followed Monkman-Grant relationship. The selected samples were taken for characterization using optical microscopy and scanning electron microscopy. The elemental compositions of the precipitates were analyzed using energy dispersive X-ray spectroscopy. This study gives an understanding of the role of microstructure on creep rupture behaviour of Grade 91 steel in the base metal and weld joints.

91级钢广泛用于电厂的高温应用。试验试样由91级钢的母材和焊接部分制成，分别在575 ~ 675℃的温度范围和60 ~ 220 MPa的应力范围内进行拉伸和蠕变试验。了解91级钢在不同外加应力下直至断裂的蠕变变形行为，对于确保电厂结构部件的可靠蠕变寿命和安全运行至关重要。BM和WM试样的断裂时间为15 ~ 5208 h。最小蠕变速率与断裂时间的应力关系符合Norton幂定律，在575 ~ 675℃温度范围内，应力指数在4.6 ~ 19.3之间。在625°C拉伸过程中，由于存在MX析出物，应变硬化指数也大幅增加。在575°C和625°C时，应力指数较高，主要是位错与析出相和晶界的相互作用所致。并对母材和焊缝进行阈值应力分析，找出蠕变的作用机理。考虑阈值应力，在575 ~ 675℃温度范围内，真实应力指数约为4.6和5.1，证实位错爬升是蠕变的速率控制机制。最小蠕变速率和断裂时间数据符合Monkman-Grant关系。所选样品采用光学显微镜和扫描电镜进行表征。用能量色散x射线光谱分析了析出相的元素组成。本研究揭示了91级钢在母材和焊缝中微观组织对蠕变断裂行为的影响。

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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 : 2026-02-01 Epub 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

FE validation of R6 J estimation for circumferentially cracked pipes under combined residual stress and mechanical loading: Reconstruction of R6 Level 3 axial residual stress for pipe butt weld 残余应力与机械载荷联合作用下圆周裂纹管道R6 J估计的有限元验证：管道对接焊缝R6 3级轴向残余应力重构

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: 2025-10-27 DOI: 10.1016/j.ijpvp.2025.105695

Hyun-Jae Lee , Hune-Tae Kim , Seok-Pyo Hong

To investigate the guidance for existing methods to estimate stress intensity factors (K_I) and the J-integrals for circumferentially cracked pipes in the presence of weld residual stress (WRS), finite element (FE) analysis is conducted. The axial component of the Level 3 WRS profiles provided in R6 is considered. It is found that the weight function method is applicable for K_I estimation, and V_o can be taken as unity for J estimation as advised in R6. Furthermore, the interaction, within elastic-plastic regime, between the Level 3 profiles and axial tension as mechanical loading can be addressed using the no elastic follow-up V-factor, V⁽²⁾. Noting that reconstruction of WRS for fracture mechanics FE analysis is demonstrated, and an extension to the Level 2 profiles, upper-bound profiles, is discussed as a means to reduce conservatism.

为了研究存在焊缝残余应力（WRS）的周裂管应力强度因子（KI）和j积分估算方法的指导意义，进行了有限元分析。考虑了R6中提供的3级WRS剖面的轴向分量。发现权函数法适用于KI估计，R6中建议将Vo作为J估计的单位。此外，在弹塑性状态下，Level 3型材和轴向拉力作为机械载荷之间的相互作用可以使用无弹性后续V因子V(2)来解决。注意到用于断裂力学有限元分析的WRS重建，并讨论了扩展到2级剖面（上界剖面）作为降低保守性的一种手段。

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