International Journal of Pressure Vessels and Piping最新文献

{"title":"Failure investigation of the inconel 783 alloy bolt used in an ultra-supercritical power plant","authors":"Haiyue Pang ,&nbsp;Qu Liu ,&nbsp;Zhipeng Cai ,&nbsp;Kejian Li","doi":"10.1016/j.ijpvp.2025.105676","DOIUrl":"10.1016/j.ijpvp.2025.105676","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105676"},"PeriodicalIF":3.5,"publicationDate":"2025-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145289780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effect of installation deviation on the natural characteristics of hydraulic L-shaped pipelines: Simulation and experimental study","authors":"Chengbo Wang ,&nbsp;Xumin Guo ,&nbsp;Longfei Chi ,&nbsp;Guoxiong An ,&nbsp;Tianyu Zhao","doi":"10.1016/j.ijpvp.2025.105680","DOIUrl":"10.1016/j.ijpvp.2025.105680","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105680"},"PeriodicalIF":3.5,"publicationDate":"2025-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Explainable machine-learning-assisted failure analysis of moderately thick composite cylindrical shells under hydrostatic pressure","authors":"Wang Hao ,&nbsp;Zhan Ming ,&nbsp;Li Yongsheng ,&nbsp;Wang Lihui","doi":"10.1016/j.ijpvp.2025.105672","DOIUrl":"10.1016/j.ijpvp.2025.105672","url":null,"abstract":"<div><div>Moderately thick composite cylindrical shells are widely used in submarine pressure-resistant structures. This study employed machine learning to analyse the failure of moderately thick composite cylindrical shells under hydrostatic pressure. Ten moderately thick composite cylindrical shells were fabricated, and their failure behaviour was examined through hydrostatic experiments and finite element analysis (FEA). Subsequently, their failure modes were analysed using FEA. Furthermore, this study trained a TabNet model for predicting the failure pressure of moderately thick composite cylindrical shells, and the model's accuracy and interpretability were validated. The trained TabNet was used to analyse the interaction effects of a shell's length-to-radius ratio (<em>L</em>/<em>R</em>), thickness-to-radius ratio (<em>T</em>/<em>R</em>), and ply angle (<em>θ</em>) on failure pressure. The experimental failure pressures were consistent with the FEA predictions (average error = 1.53 %). The <em>T</em>/<em>R</em> threshold at which the failure mode changes from buckling instability to strength failure varied with the ply angle. The threshold was lowest for shells with ply angles of ±20° and ±30°, and shells with ±10° and 0°/90° ply angles consistently exhibited buckling instability. The TabNet model, which achieved an <em>R</em>² of 0.986 on the test set, had higher accuracy for failure pressure prediction than benchmark models did. Interpretability analysis revealed that <em>θ</em> and <em>T</em>/<em>R</em> are the dominant factors affecting a shell's failure pressure. Failure pressure increases to the greatest degree as <em>T</em>/<em>R</em> increases for shells with ply angles of ±60° to ±80°. Conversely, failure pressure decreases most markedly with increasing <em>L</em>/<em>R</em> within the same ply angle range. Moreover, if <em>L</em>/<em>R</em> or <em>T</em>/<em>R</em> is increased, the optimal alternating ply angle for maximising failure pressure tends to slightly decrease. The findings of this study offer guidance for the design of pressure-resistant composite shells used in submarine applications.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105672"},"PeriodicalIF":3.5,"publicationDate":"2025-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Microstructural evolution, creep damage mechanism and failure risk of P92 steel welded joints after long-term service","authors":"Lipeng Cai ,&nbsp;Lei Zhao ,&nbsp;Kai Song ,&nbsp;Lianyong Xu ,&nbsp;Yongdian Han ,&nbsp;Kangda Hao ,&nbsp;Qingfeng Wang ,&nbsp;Derui Guo","doi":"10.1016/j.ijpvp.2025.105677","DOIUrl":"10.1016/j.ijpvp.2025.105677","url":null,"abstract":"<div><div>To ensure safe and reliable operation of high-temperature power plant components, it is crucial to evaluate the failure risk of P92 steel welded joints after long-term service. This study systematically investigated microstructural evolution and creep damage mechanisms using a multi technique characterization approach to analyze weld metal (WM), coarse grained heat-affected zone (CGHAZ), fine grained heat-affected zone (FGHAZ), and base metal (BM). Results revealed pronounced softening in the FGHAZ, with microhardness declining to 175 HV10, while repair welding partially restored microstructure and hardness in WM and CGHAZ. Degradation in FGHAZ, including precipitate coarsening and lath structure loss, remained largely irreversible. Creep cavities preferentially nucleated at δ-ferrite, grain boundary triple junctions, and coarse M₂₃C₆ and Laves phases. TEM observations showed extensive dislocation entanglement and slip around coarse precipitates, facilitating microcrack initiation, whereas MX carbonitrides remained stable. EBSD analysis indicated severe microstructural degradation in FGHAZ, with reduced lath boundaries and kernel average misorientation, and increased fractions of recrystallized grains and subgrains, contributing to localized softening and elevated creep susceptibility. Based on these findings, a creep damage model governed by microstructural degradation and abnormal δ-ferrite distribution was proposed. Overall, the study identified δ-ferrite and coarse precipitates as primary damage nucleation sites, providing quantitative microstructural metrics to guide failure risk assessment and life prediction of P92 welded joints after long-term service.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105677"},"PeriodicalIF":3.5,"publicationDate":"2025-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simplified formulation of the Beremin model's industrial variation for pressurized thermal shocks","authors":"S. Chapuliot,&nbsp;C. Sénac","doi":"10.1016/j.ijpvp.2025.105674","DOIUrl":"10.1016/j.ijpvp.2025.105674","url":null,"abstract":"<div><div>This paper presents the development of a semi-analytical version of the industrial variation of the Beremin model for brittle fracture exclusion. Such an approximate expression is needed for two branches of safety analysis: on the one hand, for probabilistic studies which cover a large set of material, loadings, and geometrical conditions, and on the other hand, for the severity ranking of thermomechanical transients in deterministic studies. First, this article offers a short synthesis on the industrial variation of the Beremin model. Then, the physical foundations of the semi-analytical formulation are detailed. Indeed, the latter is based on analytical developments of the stress field at the tip of a crack combined with simplifying assumptions that are checked on fracture mechanics specimen of various geometry and on reactor pressure vessels’ surface defects. Owing to these prior analyses, a simple formulation relying on three geometrical parameters and one material-dependent parameter is finally proposed. The accuracy of this semi-analytical formulation is established by a comparison to the detailed industrial variation of the Beremin model on two complex industrial applications.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105674"},"PeriodicalIF":3.5,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145267755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Investigation of corrosion effects on the performance of underground steel pipelines under blast loading and a solution for retrofitting","authors":"Mohammad Tabiee,&nbsp;Alireza Khaloo","doi":"10.1016/j.ijpvp.2025.105669","DOIUrl":"10.1016/j.ijpvp.2025.105669","url":null,"abstract":"<div><div>Pipelines have long been used for the transportation of strategic fluids worldwide. However, exposure to environmental conditions and extended service life significantly increase the risk of corrosion, which in turn reduces the structural strength of pipelines against external loads, particularly blast loading. This study numerically investigates the behavior of pipelines with internal and external corrosion subjected to blast loads. The use of fiber-reinforced polymers (FRP) is also examined as a retrofitting technique to enhance the blast resistance of corroded pipelines. A parametric study was performed to assess the influence of corrosion geometry and FRP thickness on the structural response. The results demonstrate that FRP effectively improves the blast performance of corroded pipelines under various conditions. Specifically, employing CFRP with half the pipe thickness reduces the maximum stress by over 30 % and decreases the maximum longitudinal and hoop strains by more than 55 % in certain cases. This study integrates blast–corrosion interaction with FRP retrofitting strategies within a validated Coupled Eulerian–Lagrangian (CEL) framework, providing a novel approach to assessing the dynamic performance of corroded pipelines. The findings offer quantitative engineering guidance for the protection and strengthening of buried pipelines subjected to extreme explosion scenarios.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105669"},"PeriodicalIF":3.5,"publicationDate":"2025-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266998","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Numerical and experimental analysis of welding parameters on residual stress in stainless steel 304L using ultrasonic methods","authors":"Amirhossein Rasfijani,&nbsp;Alireza Fadaei,&nbsp;Mohammadjavad Maghsoudi,&nbsp;Mehdi Ahmadi Najafabadi","doi":"10.1016/j.ijpvp.2025.105665","DOIUrl":"10.1016/j.ijpvp.2025.105665","url":null,"abstract":"<div><div>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.</div><div>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.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105665"},"PeriodicalIF":3.5,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221032","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Strain hardening effect on TES collapse moment of different angled pipe bends subjected to bending moments","authors":"Manish Kumar","doi":"10.1016/j.ijpvp.2025.105673","DOIUrl":"10.1016/j.ijpvp.2025.105673","url":null,"abstract":"<div><div>Piping systems carry fluid from one location to another and pipe bends are one of the most critical component due to its large deformation and high stress bearing nature. Collapse moment is one the criteria that helps to determine the strength of the pipe bend. The present study carries extensive three dimensional analyses to calculate the collapse moment of pipe bends (30° to 180° with interval of 30°) using twice-elastic-slope (TES) method. This paper focuses on the strain hardening (SH) effect on TES collapse moment based on elastic perfectly-plastic (EPP) material model for different bend angle and piping thickness under in-plane (closing (IPC) and opening (IPO)) and out-of-plane (OP) bending modes. From the results, it is clear that pipe thickness has significant role on hardening effect. Under IPC and OP bending modes, thicker pipe bend shows maximum hardening effect whereas under IPO mode least pipe thickness shows maximum hardening behavior due to its deformation pattern. Strain hardening effect changes maximum when bend angle changes from 30° to 60° for all bending modes. The hardening effect does not changes much for bend angle 60° to 180° under IPC and OP bending modes. Under IPO bending, hardening effect depends on bend angle for thinner pipe bends and for thicker pipe bends, it is independent of bend angle. This study helps to evaluate the bend angle hardening behavior influence on TES collapse moment which ultimately help determine the SH material model TES collapse moment based on the EPP material model.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105673"},"PeriodicalIF":3.5,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of AM70 high-strength steel processed via wire arc additive manufacturing for pressure vessel applications: Role of spray and pulsed arc","authors":"Nikita Kumari,&nbsp;Kumar Kanishka,&nbsp;Bappa Acherjee","doi":"10.1016/j.ijpvp.2025.105671","DOIUrl":"10.1016/j.ijpvp.2025.105671","url":null,"abstract":"<div><div>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.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105671"},"PeriodicalIF":3.5,"publicationDate":"2025-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221029","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The role of heterogeneity and pop-in events when assessing brittle fracture in the weld metal of multi-pass welds","authors":"Daniela V. Klein ,&nbsp;Pål Efsing ,&nbsp;Jonas Faleskog","doi":"10.1016/j.ijpvp.2025.105664","DOIUrl":"10.1016/j.ijpvp.2025.105664","url":null,"abstract":"<div><div>Fracture toughness testing was conducted on 81 SE(B)-specimens extracted from the weld metal of an aged pressurizer weld, of which 42 were deep-cracked and 39 shallow-cracked specimens. The crack tips were positioned in distinct zones in the weld metal, which was achieved by polishing and etching the material to reveal prior-austenite grain boundaries prior to specimen manufacturing. Deep-cracked specimens with crack tips located in the as-welded zone and where dendrites exhibit a low inclination to the pre-crack plane, frequently showed pop-in events during testing. The length of these pop-ins correlated directly with the length of the weld zone in front of the crack tip. Toughness was evaluated both at the pop-in and at final failure, and values were assigned to the corresponding weld zones. The ductile-to-brittle transition temperature was determined separately for each zone, confirming that the as-welded zone with low dendrite inclination is the most critical in the aged weld.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"219 ","pages":"Article 105664"},"PeriodicalIF":3.5,"publicationDate":"2025-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145221030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}