International Journal of Pressure Vessels and Piping最新文献

{"title":"Effects of different types of corrosion on seismic performance of circular hollow section T-joints subjected to coupling load","authors":"","doi":"10.1016/j.ijpvp.2024.105355","DOIUrl":"10.1016/j.ijpvp.2024.105355","url":null,"abstract":"<div><div>The purpose of this paper is to investigate the effects of different types of corrosion on seismic performances of circular hollow section (CHS) T-joints subjected to in-plane cyclic load. Firstly, the validity of a numerical modeling method introducing the actual corrosion morphological characteristics was verified by comparing with experimental results. Subsequently, the influences of different corrosion characteristic parameters (corrosion types, corrosion position and corrosion level) on the hysteresis behaviors of CHS T-joints under the cyclic bending load were discussed in detail, and the analysis results indicated: 1) compared with the pitting damage, the degradation behavior of CHS T-joints with the equivalent uniform corrosion was closer to that of the CHS T-joints with the actual corrosion morphology; 2) the degradation level of cyclic bearing capacities of CHS T-joints with the general corrosion was higher than that of CHS T-joints with brace or chord corrosion under the same condition; 3) the increase in dimension of the single pit had little influence on affecting the hysteresis behavior of CHS T-joints, the bearing capacities and energy dissipation of CHS T-joints significantly decreased with the increasing distribution density of pits, even leading to the change of failure mode of CHS T-joint under cyclic bending load; 4) when the volume loss of different types of corrosion was similar, the higher the local corrosion damage, the more serious the seismic performance degradation of CHS T-joints. When the volume loss caused by different types of corrosion was transferred to the thickness loss, the ultimate capacities of corroded CHS T-joints could be calculated by applying the existing formulas. However, the calculation value was lower than the numerical results due to overestimating the adverse effects of corrosion on the axial bearing capacity of CHS T-joints.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593801","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":"An experimental investigation on fracture toughness predictions for carbon segregation metals using spherical indentation tests","authors":"","doi":"10.1016/j.ijpvp.2024.105357","DOIUrl":"10.1016/j.ijpvp.2024.105357","url":null,"abstract":"<div><div>The occurrence of carbon segregation in steam generator (SG) often leads to a decrease in fracture toughness and an increase in failure risk. To ensure the service safety of SG, a non-destructive testing method for quantitative evaluation of fracture toughness reduction with carbon segregation is necessary. To this end, this study provides an experimental investigation on whether the spherical indentation tests (SITs) are capable of revealing the fracture toughness reduction with the increasing carbon content. Solidarity of the existing fracture toughness prediction models has been extensively investigated through experiments on four carbon segregation samples with carbon content 0.21 %, 0.31 %, 0.35 %, and 0.39 %, respectively. It is found that both the critical strain and critical damage criteria, depending on phenomenologically summarized fixed critical values, failed in reproducing the decreasing trend of fracture toughness with increasing carbon content. For the critical stress criterion, the updated critical value, achieved by comparing the results of conventional fracture toughness and indentation tests on the steel with 0.21 % carbon content, can improve the prediction accuracy and successfully reproduce of variation of fracture toughness with carbon contents. However, consistency of three repeated predictions from the critical stress criteria is poor, which may hinder its engineering application. By contrast, the energy release rate model independent of phenomenologically summarized critical values can yield roughly well predictions, from viewpoints of both decreasing trend of fracture toughness with increasing carbon content and the repeatability of three tests. This experimental investigation can provide methodological guidance for nondestructive fracture toughness evaluation on SG facing carbon segregation.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593951","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":"Quantitative study on thermal-mechanical failure of overhead steel pipelines under natural gas jet fire","authors":"","doi":"10.1016/j.ijpvp.2024.105350","DOIUrl":"10.1016/j.ijpvp.2024.105350","url":null,"abstract":"<div><div>Parallel overhead pipelines are particularly adept at traversing intricate terrains. Nonetheless, the emergence of jet flames due to initial pipeline incidents can precipitate failures in adjacent pipelines, thereby intensifying the overall situation. Therefore, it is essential to examine the thermal-mechanical responses of pipelines exposed to natural gas jet fires. Building on combustion mechanisms, a transient thermal-mechanical coupling model has been developed for full-scale steel pipelines in the context of natural gas jet fires. The thermal-mechanical response characteristics of these pipelines are subsequently analyzed, and the impacts of four distinct variables on pipe wall temperature and normalized stress are quantitatively evaluated. Ultimately, a safety evaluation methodology for pipelines subjected to jet flames is proposed, which integrates critical thermal failure criteria with PSO-LSTM algorithm. The results demonstrate that the proposed thermal-mechanical coupling model effectively simulates the thermal effects of jet fires on pipelines, achieving a model error of less than 10 %. Notably, the flow velocity of crude oil has the most pronounced effect on the thermal failure of the pipeline. The established thermal-mechanical failure criterion, in conjunction with the PSO-LSTM hybrid model (average error of 5.57 %), enables the rapid prediction of critical failure conditions across a wide range of operational scenarios.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586846","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":"Analytical evaluation of the elastic stresses in a multilayer spherical pressure vessel","authors":"","doi":"10.1016/j.ijpvp.2024.105354","DOIUrl":"10.1016/j.ijpvp.2024.105354","url":null,"abstract":"<div><div>An explicit-form solution is constructed for a problem on elastic deformation of a multilayer spherical vessel due to uniform internal pressure. The vessel is assembled of perfectly connected elastic layers whose material properties may arbitrarily vary across their thickness. The solution is constructed through the use of the single solid approach along with the modified scheme of the direct integration method which allow for the consideration of the multilayer vessel as a composite sphere with piecewise-variable profiles of the material properties. As a result, the original problem is reduced to solving a governing integral equation of the second kind whose solution is constructed in the form of the explicit dependence on the internal pressure. The solution is verified by the comparison with exact solutions derived by making use the method of tailored solutions for specific benchmark problems. By comparing our with the one for a functionally-graded sphere, whose material properties are evaluated through the use of the micromodular homogenization technique, the specific features of the circumferential stress are analyzed.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572253","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":"Guidance for structural integrity assessment of smooth pipe elbows containing defects using R6","authors":"","doi":"10.1016/j.ijpvp.2024.105353","DOIUrl":"10.1016/j.ijpvp.2024.105353","url":null,"abstract":"<div><div>Recently, guidance for fracture assessment of defective elbows using the R6 failure assessment diagram (FAD) method has been included in R6 Revision 4 Amendment 13 (2023). This paper provides an overview of the new guidance and supporting validation. The guidance is validated using 75 cases of 3-D finite element (FE) elastic-plastic <em>J</em> results of smooth pipe elbows of various geometries with axial/circumferential internal/external semi-elliptical/extended/fully-circumferential surface cracks under internal pressure, in-plane/out-of-plane bending moment, torsion and various load combinations, by comparing the FE-based Option 3 failure assessment curves (FAC) with the R6 Option 2 FAC. The results show that, for 74 out of 75 cases, the FE-based Option 3 data points are above the R6 Option 2 FAC with reasonable conservatism when the guidance for evaluating the elbow stress intensity factor and limit load is followed. In other words, following the new guidance can lead to reasonably conservative assessment results.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-10-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142572254","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":"Predicting creep life of CrMo pressure vessel steel using machine learning models with optimal feature subset selection","authors":"","doi":"10.1016/j.ijpvp.2024.105349","DOIUrl":"10.1016/j.ijpvp.2024.105349","url":null,"abstract":"<div><div>The data-driven approach for creep life prediction typically integrates numerous characteristics, including material compositions, manufacturing details, and service conditions, into machine learning models. In this study, a machine learning-based creep life prediction approach with optimal feature subset selection is established for 2.25Cr1Mo pressure vessel steel. Before model training and testing, six critical features that significantly impact the creep life of 2.25Cr1Mo steel are selected, specifically the applied stress, temperature, and chemical compositions consisting of Cr, Ni, Mn, and Mo. Various machine learning algorithms, along with the traditional L–M method, are utilized for model training and performance evaluation. Additionally, the developed models undergo validation using experimental data independent of the training and testing datasets to assess their generalization abilities. The results reveal that, among all tested models, the support vector regression (SVR) model, coupled with the optimal feature subset, demonstrates superior prediction accuracy and generalization capability. Finally, the creep life prediction model exhibiting optimal performance is deployed into a software application, leveraging the Python programming language. This predictor tool facilitates rapid and precise creep life predictions for 2.25Cr1Mo pressure vessel steel, relying solely on a limited amount of input information, and provides a clear and visual presentation of the prediction results.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553542","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":"Determination of the Gurson-Tvergaard-Needleman damage model parameters for simulating small punch tests of heat-resistant alloys","authors":"","doi":"10.1016/j.ijpvp.2024.105348","DOIUrl":"10.1016/j.ijpvp.2024.105348","url":null,"abstract":"<div><div>The small punch (SP) test is utilized to assess the mechanical characteristics and damage progression of heat-resistant alloys. The inverse finite element analysis method incorporating SP tests is a parameter identification method based on adjusting the accuracy of the simulated load-displacement curves. In this paper, the elastoplastic parameters of the Hollomon model and the damage parameters of the Gurson-Tvergaard-Needleman (GTN) model are determined based on the undamaged and damaged stages of the load-displacement curves, respectively. The whole stress-strain curves of the tested materials are then built using the results of finite element simulations of the tensile specimens of ZG15Cr2Mo1, P91, 316H, and Hastelloy X at room and elevated temperatures. Comparison with uniaxial tensile tests indicates that the simulated stress-strain curves closely resemble the experimental data from the tensile testing. In addition, the simulated damage evolution characteristics of the SP specimens are consistent with the mechanical model based on the actual deformation behavior. It is possible to comprehend the damage evolution process by analyzing the SP specimens’ stress and strain change characteristics.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553544","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":"Structural integrity assessment of pipe elbows: Burst test and finite element analysis","authors":"","doi":"10.1016/j.ijpvp.2024.105339","DOIUrl":"10.1016/j.ijpvp.2024.105339","url":null,"abstract":"<div><div>In this study, the failure pressures of pipe elbows were compared with those predicted using Level 3 numerical assessment method (Finite Element Method). Four 90-degree pipes elbows representing a pristine pipe, a pipe with a single corrosion defect, a pipe with longitudinally aligned interacting defects, and a pipe with a circumferentially aligned interacting defects, were subjected to internal pressure based on the ASME B31.3–2012 Burst Test standard until failure. The Sch-80 pipes were made of ASTM <span><span>A234</span><svg><path></path></svg></span> WPB steel with a wall thickness and bending radius of 12.7 mm and 305 mm respectively. The corrosion defects were simulated on the exterior surface of the pipe elbows using computer numerical control (CNC) machine to generate a machined version of the corrosion defect. The results revealed that corrosion defects significantly reduce the burst pressure of pipe elbows, with longitudinally aligned interacting defects causing the largest reduction of 20.9 % compared to pristine pipe. The comparison between the Level 3 numerical assessment method and burst test showed close agreement with a maximum difference of 4.79 %, confirming the accuracy and reliability of the numerical method.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-10-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553545","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":"Study on low temperature and narrow heating bands of post weld heat treatment for girth welds stress reduction of long-distance pipelines","authors":"","doi":"10.1016/j.ijpvp.2024.105347","DOIUrl":"10.1016/j.ijpvp.2024.105347","url":null,"abstract":"<div><div>Residual stress affects the service safety of pipelines, but there are few efficient methods to reduce the residual stress, especially for long-distance pipelines with large diameters. In this paper, a Secondary Post Weld Heat Treatment (S-PWHT) stress reduction method with low temperature and two narrow heating bands is proposed, and this method fully considers the failure of the corrosion resistance layer caused by high temperature. The temperature distribution and stress distribution under different S-PWHT parameters are compared to obtain the optimal S-PWHT parameters using finite element numerical simulation. The thermocouples are conducted to verify the temperature, and the coercivity experiment is used to verify the stress distribution. Results show that two heating bands width of 80 mm and a peak temperature of 120 °C are the optimal S-PWHT parameters with the stress reduced by 61 %. Besides, the levels of stress reduction on the inner surface and the HAZ are higher than those on the outer surface and the base metal, respectively. The high-stress zone is transferred from the inner surface to the outer surface, and from the HAZ to the base metal. Furthermore, the stress reduction mechanism of S-PWHT has been revealed through constraint theory. Temperature change is the initial force, and the constraint is the driving force for stress reduction.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142553543","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":"Tracking research on the performance changes of S31042 steel under long term service","authors":"","doi":"10.1016/j.ijpvp.2024.105344","DOIUrl":"10.1016/j.ijpvp.2024.105344","url":null,"abstract":"<div><div>S31042 is widely used in ultra-supercritical units due to its excellent comprehensive performance at high temperatures. Tracking and monitoring research was conducted on as-received S31042 tubes and tubes in service for 13 k hours, 31 k hours, and 52 k hours at 650 °C. The results show that as the service time increased, a large quantity of M₂₃C₆ phase precipitated along the grain boundaries, gathered and grew up into the bulk. This weakened of the grain boundaries, which facilitated crack propagation and significantly reduced the plasticity and toughness of the S31042 heat-resistant steel. After 13 k hours of operation, the dispersion strengthening of the precipitated phase inside the grain and grain boundary led to a substantial increase in hardness, while there was no obvious change in strength. However, after 52 k hours of operation, the dispersed precipitated phase within the grain slowly aggregated and grew, decreasing the effectiveness of dispersion strengthening. Consequently, both the high-temperature strength and hardness of the S31042 steel gradually decreased. As the service time increased, the continuously distributed and similarly sized M₂₃C₆ phases on the grain boundaries of S31042 developed into an inhomogeneous coarsening chain structure. Additionally, the appearance of nanoscale secondary NbCrN and M₂₃C₆ phases within the grain and their resulting precipitation strengthening effects were the main reasons for the significant change in S31042 hardness values. Based on these findings, the residual life of S31042 heat-resistant steel in service was predicted using an extrapolation method based on high-temperature creep rupture tests and the relationship model between hardness and the P function. A comparison of the L-M parametric life prediction results with the strength extrapolation life prediction results based on the standard creep rupture test shows that the creep rupture strength extrapolation method is slightly conservative. Therefore, the prediction results based on the hardness L-M parameter method, which is simple and easy to perform, can be used for preliminary life prediction.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":null,"pages":null},"PeriodicalIF":3.0,"publicationDate":"2024-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142432205","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}