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Microstructural characterization of dissimilar laser beam welded joints between Incoloy 800HT and P91 steel
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-12-12 DOI: 10.1016/j.ijpvp.2024.105408
V. Lakshmanan , T. Arunnellaiappan , P. Sathiya
This study investigates the microstructural characterization of dissimilar joints between Incoloy 800HT and P91 steel, fabricated using Yb laser beam welding. The research focuses on understanding the effects of various laser welding parameters, including power, speed, and focal length, on the weld quality. Detailed analysis reveals the formation of different grain structures, such as equiaxed and columnar dendritic structures, influenced by the temperature gradient and solidification rates. The study also examines the formation of Type I and Type II grain boundaries, and the presence of δ-ferrite in the weld metal, which contributes to the weld's mechanical properties. The elemental distribution, particularly the roles of Fe, Cr, and Ni, is analyzed using EPMA, highlighting significant changes across the weld zone. The findings demonstrate the critical role of optimizing laser welding parameters to achieve defect-free, high-strength welds suitable for high-temperature applications such as power plants and gas turbines.
{"title":"Microstructural characterization of dissimilar laser beam welded joints between Incoloy 800HT and P91 steel","authors":"V. Lakshmanan ,&nbsp;T. Arunnellaiappan ,&nbsp;P. Sathiya","doi":"10.1016/j.ijpvp.2024.105408","DOIUrl":"10.1016/j.ijpvp.2024.105408","url":null,"abstract":"<div><div>This study investigates the microstructural characterization of dissimilar joints between Incoloy 800HT and P91 steel, fabricated using Yb laser beam welding. The research focuses on understanding the effects of various laser welding parameters, including power, speed, and focal length, on the weld quality. Detailed analysis reveals the formation of different grain structures, such as equiaxed and columnar dendritic structures, influenced by the temperature gradient and solidification rates. The study also examines the formation of Type I and Type II grain boundaries, and the presence of δ-ferrite in the weld metal, which contributes to the weld's mechanical properties. The elemental distribution, particularly the roles of Fe, Cr, and Ni, is analyzed using EPMA, highlighting significant changes across the weld zone. The findings demonstrate the critical role of optimizing laser welding parameters to achieve defect-free, high-strength welds suitable for high-temperature applications such as power plants and gas turbines.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105408"},"PeriodicalIF":3.0,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165429","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}
引用次数: 0
Optimizing the combined isotropic/kinematic hardening parameters of pressure vessel materials and welds using the incremental elastic-limit approach
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-12-12 DOI: 10.1016/j.ijpvp.2024.105407
Shutong Zhang , Yannis P. Korkolis , Kaue C. Riffel , Antonio J. Ramirez
In this work, a novel optimization approach is introduced to extract combined hardening parameters from the cyclic stress-strain data obtained from the initial hardening cycles of isothermal, low-cycle fatigue tests. The incremental elastic-limit (IEL) concept is proposed due to the often-undiscernible elastic range of a stabilized stress-strain cycle, that increases the complexity of hardening parameters optimization. The optimization process is implemented by taking an iterative search for the elastic range by a fixed elastic limit increment, and the corresponding hardening parameters are obtained using the nonlinear fitting algorithms in the MATLAB™ Software. An implicit stress-update function is introduced to simulate the cyclic stress and strain with a given set of hardening parameters and yield strength. The fitness of the optimization is calculated based on the least square difference between the experimental and simulated stress-strain data. Furthermore, the IEL concept is incorporated to optimize the cyclic hardening parameters. In the final step, finite element (FE) analysis using the optimized hardening parameters is applied to demonstrate the effectiveness of the IEL approach. The proposed methodology is applied to pressure vessel steels and Ni-based weld metals.
{"title":"Optimizing the combined isotropic/kinematic hardening parameters of pressure vessel materials and welds using the incremental elastic-limit approach","authors":"Shutong Zhang ,&nbsp;Yannis P. Korkolis ,&nbsp;Kaue C. Riffel ,&nbsp;Antonio J. Ramirez","doi":"10.1016/j.ijpvp.2024.105407","DOIUrl":"10.1016/j.ijpvp.2024.105407","url":null,"abstract":"<div><div>In this work, a novel optimization approach is introduced to extract combined hardening parameters from the cyclic stress-strain data obtained from the initial hardening cycles of isothermal, low-cycle fatigue tests. The incremental elastic-limit (<strong>IEL</strong>) concept is proposed due to the often-undiscernible elastic range of a stabilized stress-strain cycle, that increases the complexity of hardening parameters optimization. The optimization process is implemented by taking an iterative search for the elastic range by a fixed elastic limit increment, and the corresponding hardening parameters are obtained using the nonlinear fitting algorithms in the MATLAB™ Software. An implicit stress-update function is introduced to simulate the cyclic stress and strain with a given set of hardening parameters and yield strength. The fitness of the optimization is calculated based on the least square difference between the experimental and simulated stress-strain data. Furthermore, the IEL concept is incorporated to optimize the cyclic hardening parameters. In the final step, finite element (<strong>FE</strong>) analysis using the optimized hardening parameters is applied to demonstrate the effectiveness of the IEL approach. The proposed methodology is applied to pressure vessel steels and Ni-based weld metals.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105407"},"PeriodicalIF":3.0,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165497","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}
引用次数: 0
Influence of hydrogen produced during steam oxidation on creep deformation and rupture ductility of Gr.92 steel
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-12-12 DOI: 10.1016/j.ijpvp.2024.105410
Fujio Abe , Hai Chang , Weiwen Yan , Meling Wang , Chenguang Shang , Yonghao Lu , Koichi Yagi , Xuechong Ren
The influence of hydrogen produced during steam oxidation on the creep deformation and rupture ductility has been investigated for Gr.92 at 650 °C by comparing creep data in steam with those in air. The total strain εr is definitely smaller in steam than in air, while the time to minimum creep rate tm, strain to minimum creep rate εm, minimum creep rate ε˙ min and time to rupture tr are approximately the same between in steam and in air. Hydrogen introduced into the specimens from the surface oxide scale formed during creep test in steam is expected to be always uniformly distributed throughout the creep specimens with 5 mm gauge diameter during creep tests at 650 °C because of its high diffusion rate. The smaller εr in steam than in air and substantially the same εm between in steam and in air are reasonably explained by the mechanism of hydrogen-enhanced deformation-induced vacancy formation model. Large strains in the later stage of accelerating creep region, together with the presence of hydrogen during creep in steam, enable the formation of high density of vacancies and microvoids, which reduces the total strain εr. The amount of strain seems to be too small in the transient creep region, suggesting that vacancies scarcely form and hence no effect of steam environment on the tm and εm.
{"title":"Influence of hydrogen produced during steam oxidation on creep deformation and rupture ductility of Gr.92 steel","authors":"Fujio Abe ,&nbsp;Hai Chang ,&nbsp;Weiwen Yan ,&nbsp;Meling Wang ,&nbsp;Chenguang Shang ,&nbsp;Yonghao Lu ,&nbsp;Koichi Yagi ,&nbsp;Xuechong Ren","doi":"10.1016/j.ijpvp.2024.105410","DOIUrl":"10.1016/j.ijpvp.2024.105410","url":null,"abstract":"<div><div>The influence of hydrogen produced during steam oxidation on the creep deformation and rupture ductility has been investigated for Gr.92 at 650 °C by comparing creep data in steam with those in air. The total strain <em>ε</em><sub>r</sub> is definitely smaller in steam than in air, while the time to minimum creep rate <em>t</em><sub>m</sub>, strain to minimum creep rate <em>ε</em><sub>m</sub>, minimum creep rate <span><math><mrow><mover><mi>ε</mi><mo>˙</mo></mover></mrow></math></span> <sub>min</sub> and time to rupture <em>t</em><sub>r</sub> are approximately the same between in steam and in air. Hydrogen introduced into the specimens from the surface oxide scale formed during creep test in steam is expected to be always uniformly distributed throughout the creep specimens with 5 mm gauge diameter during creep tests at 650 °C because of its high diffusion rate. The smaller <em>ε</em><sub>r</sub> in steam than in air and substantially the same <em>ε</em><sub>m</sub> between in steam and in air are reasonably explained by the mechanism of hydrogen-enhanced deformation-induced vacancy formation model. Large strains in the later stage of accelerating creep region, together with the presence of hydrogen during creep in steam, enable the formation of high density of vacancies and microvoids, which reduces the total strain <em>ε</em><sub>r</sub>. The amount of strain seems to be too small in the transient creep region, suggesting that vacancies scarcely form and hence no effect of steam environment on the <em>t</em><sub>m</sub> and <em>ε</em><sub>m</sub>.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105410"},"PeriodicalIF":3.0,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165342","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}
引用次数: 0
An overview of using the minimum of three equivalent (MOTE) in the assessment of fracture toughness behaviour in the context of BS 7910
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-12-06 DOI: 10.1016/j.ijpvp.2024.105403
Paul U. Sukpe , Fabian S. Sorce , Catrin M. Davies , Stephen J. Garwood , Dan Cogswell , Henryk Pisarski
In this work, fracture toughness values used in engineering critical assessment (ECA) based on the minimum of three equivalent (MOTE) concept within the British Standard (BS) 7910 framework has been examined. The MOTE concept, statistical analyses, and the implications of selecting fracture toughness values using MOTE on ECA outcome are discussed. BS 7910 specifies that the lowest test result should be used when 3 to 5 results are available, the second lowest for 6 to 10 and third lowest for 11 to 15. However, this approach assumes that the data is homogeneous, and the MOTE concept is only valid for minimum of three results when scatter is limited.
Four fracture toughness distributions were defined in this study, with characteristic values estimated using a ln-normal distribution and Monte Carlo simulations. The findings suggest that the ln-normal approach offers more reliable fracture toughness estimates, and ten test results are generally adequate. However, for high-integrity applications, it is recommended to use at least twenty-five test results to estimate the characteristic fracture toughness based on a 5th percentile with 75 % confidence.
{"title":"An overview of using the minimum of three equivalent (MOTE) in the assessment of fracture toughness behaviour in the context of BS 7910","authors":"Paul U. Sukpe ,&nbsp;Fabian S. Sorce ,&nbsp;Catrin M. Davies ,&nbsp;Stephen J. Garwood ,&nbsp;Dan Cogswell ,&nbsp;Henryk Pisarski","doi":"10.1016/j.ijpvp.2024.105403","DOIUrl":"10.1016/j.ijpvp.2024.105403","url":null,"abstract":"<div><div>In this work, fracture toughness values used in engineering critical assessment (ECA) based on the minimum of three equivalent (MOTE) concept within the British Standard (BS) 7910 framework has been examined. The MOTE concept, statistical analyses, and the implications of selecting fracture toughness values using MOTE on ECA outcome are discussed. BS 7910 specifies that the lowest test result should be used when 3 to 5 results are available, the second lowest for 6 to 10 and third lowest for 11 to 15. However, this approach assumes that the data is homogeneous, and the MOTE concept is only valid for minimum of three results when scatter is limited.</div><div>Four fracture toughness distributions were defined in this study, with characteristic values estimated using a <span><math><mrow><mi>ln</mi></mrow></math></span>-normal distribution and Monte Carlo simulations. The findings suggest that the <span><math><mrow><mi>ln</mi></mrow></math></span>-normal approach offers more reliable fracture toughness estimates, and ten test results are generally adequate. However, for high-integrity applications, it is recommended to use at least twenty-five test results to estimate the characteristic fracture toughness based on a 5th percentile with 75 % confidence.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105403"},"PeriodicalIF":3.0,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165424","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Features of recovery annealing after low temperature irradiation of supporting structures materials of WWER-440 reactor vessels
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-12-06 DOI: 10.1016/j.ijpvp.2024.105404
Boris Margolin , Еlena Yurchenko , Аnatoliy Morozov , Andrey Varovin , Sergey Rogozhkin , Aleksandr Nikitin
The annealing temperature effect on the degree of properties recovery has been studied for supporting structures (SS) materials of WWER-440 reactor pressure vessels. SS materials such as ferritic-pearlitic steels have been investigated in unirradiated state, after irradiation at low temperatures (50 … 90 °C) and after post-radiation annealing. The degrees of radiation embrittlement of SS materials and the properties recovery under annealing have been determined on the basis of tension tests, impact strength tests, fracture toughness tests and microhardness investigations. The mechanical test results have been interpreted on the basis of the obtained data of APT analysis. The dependence of the properties recovery coefficient on annealing temperature has been quantified. The main processes occurring under post-radiation annealing and affecting the recovery degree of the properties of SS materials have been revealed.
It is shown that for SS material with high copper content the annealing in the temperature range (150–275) °С does not lead to any recovery of the properties of SS materials. At temperatures higher than 300°С the recovery of properties begins, and at 400°С there is practically a complete recovery of the SS material properties with high copper content. For SS materials with low copper content the annealing at temperatures below 300°С can be quite effective. The influence of impurities (phosphorus and copper) on the embrittlement of the material under irradiation and on the recovery of its properties after annealing has been considered.
{"title":"Features of recovery annealing after low temperature irradiation of supporting structures materials of WWER-440 reactor vessels","authors":"Boris Margolin ,&nbsp;Еlena Yurchenko ,&nbsp;Аnatoliy Morozov ,&nbsp;Andrey Varovin ,&nbsp;Sergey Rogozhkin ,&nbsp;Aleksandr Nikitin","doi":"10.1016/j.ijpvp.2024.105404","DOIUrl":"10.1016/j.ijpvp.2024.105404","url":null,"abstract":"<div><div>The annealing temperature effect on the degree of properties recovery has been studied for supporting structures (SS) materials of WWER-440 reactor pressure vessels. SS materials such as ferritic-pearlitic steels have been investigated in unirradiated state, after irradiation at low temperatures (50 … 90 °C) and after post-radiation annealing. The degrees of radiation embrittlement of SS materials and the properties recovery under annealing have been determined on the basis of tension tests, impact strength tests, fracture toughness tests and microhardness investigations. The mechanical test results have been interpreted on the basis of the obtained data of APT analysis. The dependence of the properties recovery coefficient on annealing temperature has been quantified. The main processes occurring under post-radiation annealing and affecting the recovery degree of the properties of SS materials have been revealed.</div><div>It is shown that for SS material with high copper content the annealing in the temperature range (150–275) °С does not lead to any recovery of the properties of SS materials. At temperatures higher than 300°С the recovery of properties begins, and at 400°С there is practically a complete recovery of the SS material properties with high copper content. For SS materials with low copper content the annealing at temperatures below 300°С can be quite effective. The influence of impurities (phosphorus and copper) on the embrittlement of the material under irradiation and on the recovery of its properties after annealing has been considered.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105404"},"PeriodicalIF":3.0,"publicationDate":"2024-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165428","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}
引用次数: 0
Fatigue life of elbow pipe for in-plane loading (Part I: Stainless steel)
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-12-05 DOI: 10.1016/j.ijpvp.2024.105402
Masayuki Kamaya
This study aimed at clarifying whether the fatigue life of stainless steel elbow pipes is the same as that of specimens subjected to uniaxial cyclic loading. The fatigue test under in-plane cyclic displacement was conducted for a stainless steel 100A elbow pipe using six specimens. Since the strain range was a key parameter for the fatigue damage assessment, it was carefully identified in the fatigue test using a digital image correlation technique in addition to strain gauges. Finite element analyses were conducted to estimate the equivalent strain range at the crack initiation point from the measured strain range. Comparison of this fatigue life with that obtained by the fatigue tests for uniaxial loading conditions using specimens taken from an elbow pipe of the same heat indicated there was no reduction in the fatigue life of the elbow pipe for the same equivalent strain range.
{"title":"Fatigue life of elbow pipe for in-plane loading (Part I: Stainless steel)","authors":"Masayuki Kamaya","doi":"10.1016/j.ijpvp.2024.105402","DOIUrl":"10.1016/j.ijpvp.2024.105402","url":null,"abstract":"<div><div>This study aimed at clarifying whether the fatigue life of stainless steel elbow pipes is the same as that of specimens subjected to uniaxial cyclic loading. The fatigue test under in-plane cyclic displacement was conducted for a stainless steel 100A elbow pipe using six specimens. Since the strain range was a key parameter for the fatigue damage assessment, it was carefully identified in the fatigue test using a digital image correlation technique in addition to strain gauges. Finite element analyses were conducted to estimate the equivalent strain range at the crack initiation point from the measured strain range. Comparison of this fatigue life with that obtained by the fatigue tests for uniaxial loading conditions using specimens taken from an elbow pipe of the same heat indicated there was no reduction in the fatigue life of the elbow pipe for the same equivalent strain range.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105402"},"PeriodicalIF":3.0,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165341","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}
引用次数: 0
Defect localization method for ferromagnetic pipes based on stepped magnetization in magnetic permeability perturbation testing
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-12-04 DOI: 10.1016/j.ijpvp.2024.105394
Zhiyang Deng , Dingkun Qian , Yushan Wang , Pan Qi , Nan Yang , Xiaochun Song , Yihua Kang
The magnetic permeability perturbation testing (MPPT) method is effective for evaluating thick-walled steel pipes. However, determining the burial depth of a defect directly from a single time-domain signal faces challenge. The concept of magnetization layering is introduced, and a defect localization method based on stepped magnetization for ferromagnetic pipes is proposed, which focuses on the change of magnetization layering due to the non-uniform magnetization. The detection signals are acquired under a magnetic field with a step change in intensity, and the defects are localized by the characteristic current IΔV. The relationship between the characteristic current and the magnetization depth h is verified by equivalent magnetic circuit analysis and finite element simulation analysis. Experiments on different buried defects verify that the characteristic current IΔV can reflect the buried depth of defects. Finally, some key dimensional parameters of the magnetizer are discussed and optimized. The method is of great practical value for localizing defects from the signal source, which applies to different ferromagnetic pipes.
{"title":"Defect localization method for ferromagnetic pipes based on stepped magnetization in magnetic permeability perturbation testing","authors":"Zhiyang Deng ,&nbsp;Dingkun Qian ,&nbsp;Yushan Wang ,&nbsp;Pan Qi ,&nbsp;Nan Yang ,&nbsp;Xiaochun Song ,&nbsp;Yihua Kang","doi":"10.1016/j.ijpvp.2024.105394","DOIUrl":"10.1016/j.ijpvp.2024.105394","url":null,"abstract":"<div><div>The magnetic permeability perturbation testing (MPPT) method is effective for evaluating thick-walled steel pipes. However, determining the burial depth of a defect directly from a single time-domain signal faces challenge. The concept of magnetization layering is introduced, and a defect localization method based on stepped magnetization for ferromagnetic pipes is proposed, which focuses on the change of magnetization layering due to the non-uniform magnetization. The detection signals are acquired under a magnetic field with a step change in intensity, and the defects are localized by the characteristic current <span><math><mrow><msub><mi>I</mi><mrow><mo>Δ</mo><mi>V</mi></mrow></msub></mrow></math></span>. The relationship between the characteristic current and the magnetization depth <span><math><mrow><mi>h</mi></mrow></math></span> is verified by equivalent magnetic circuit analysis and finite element simulation analysis. Experiments on different buried defects verify that the characteristic current <span><math><mrow><msub><mi>I</mi><mrow><mo>Δ</mo><mi>V</mi></mrow></msub></mrow></math></span> can reflect the buried depth of defects. Finally, some key dimensional parameters of the magnetizer are discussed and optimized. The method is of great practical value for localizing defects from the signal source, which applies to different ferromagnetic pipes.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105394"},"PeriodicalIF":3.0,"publicationDate":"2024-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165425","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}
引用次数: 0
Review of limit load solutions of smooth pipe bends Part I: Defect-free bends
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-11-30 DOI: 10.1016/j.ijpvp.2024.105386
Yuebao Lei , Peter Budden
This paper summarises the review results for limit load solutions of smooth pipe bends with/without cracks under various loading conditions, which are required when performing structural integrity assessment using R6 types procedures/standards. In Part I of this paper, limit load solutions for defect-free smooth pipe bends with/without attached straight pipes under internal pressure, in-plane closing/opening bending, out-of-plane bending, torsion, combined internal pressure and in-plane bending, combined internal pressure and out-of-plane bending and combined internal pressure and torsion are reviewed and compared with available elastic-perfectly plastic finite element (FE) limit load analysis results. The outcomes of the review are summarised and some new solutions are recommended based on available solutions or available FE data.
{"title":"Review of limit load solutions of smooth pipe bends Part I: Defect-free bends","authors":"Yuebao Lei ,&nbsp;Peter Budden","doi":"10.1016/j.ijpvp.2024.105386","DOIUrl":"10.1016/j.ijpvp.2024.105386","url":null,"abstract":"<div><div>This paper summarises the review results for limit load solutions of smooth pipe bends with/without cracks under various loading conditions, which are required when performing structural integrity assessment using R6 types procedures/standards. In Part I of this paper, limit load solutions for defect-free smooth pipe bends with/without attached straight pipes under internal pressure, in-plane closing/opening bending, out-of-plane bending, torsion, combined internal pressure and in-plane bending, combined internal pressure and out-of-plane bending and combined internal pressure and torsion are reviewed and compared with available elastic-perfectly plastic finite element (FE) limit load analysis results. The outcomes of the review are summarised and some new solutions are recommended based on available solutions or available FE data.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105386"},"PeriodicalIF":3.0,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480513","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}
引用次数: 0
A ratcheting assessment method based on cumulative damage 基于累积损伤的棘轮评估方法
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-11-30 DOI: 10.1016/j.ijpvp.2024.105389
Yuping Su , Jun Shen , Libo Mu , Qianyu Shi , Mingwan Lu
Ratcheting assessment under multiple combined thermo-mechanical load cases has always been an intractable problem in pressure vessel design by analysis. Ratcheting is not allowed in the current widely adopted ratcheting assessment method based on ratcheting boundary, which is conservative and only applicable to single cyclic load case. Whereas, the ratcheting analysis based on elastic-plastic finite element analysis cycle by cycle is computationally heavy and costly. In this paper, a simple and practical ratcheting assessment method based on cumulative damage is proposed. The method is abbreviated RACD method, which is an evaluation method of plastic ratcheting strain for prevention of ratcheting collapse and allows the structure to enter the ratcheting state. Moreover, it has low computational cost and can be applied to the ratcheting assessment of combined load cases. The validity of the RACD method has been verified by the Bree model and application example in this paper. It can be indicated that the linear damage accumulation theory is applicable to the cases where multiple load cases are applied independently and sequentially, but it is not suitable for the combination of multiple loads applied alternately. The load unit assessment method proposed in this paper can effectively deal with the ratcheting assessment problem for alternating combined load cases.
通过分析,压力容器在多工况下的棘轮评估一直是压力容器设计中的一个难题。目前广泛采用的基于棘轮边界的棘轮评估方法不允许棘轮,该方法保守且仅适用于单次循环载荷情况。然而,基于弹塑性有限元逐周期分析的棘轮分析计算量大,成本高。本文提出了一种简单实用的基于累积损伤的棘轮评估方法。该方法简称RACD法,是一种防止棘轮破坏,使结构进入棘轮状态的塑性棘轮应变评价方法。此外,该方法计算成本低,可用于组合工况的棘轮评估。本文通过Bree模型和应用实例验证了RACD方法的有效性。可以看出,线性损伤累积理论适用于多个荷载分别顺序作用的情况,而不适用于多个荷载交替作用的组合。本文提出的荷载单元评估方法可以有效地解决交变组合荷载工况下的棘轮评估问题。
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引用次数: 0
Influence of stress on corrosion behavior and evolution model of Q235 steel in marine environments
IF 3 2区 工程技术 Q2 ENGINEERING, MECHANICAL Pub Date : 2024-11-29 DOI: 10.1016/j.ijpvp.2024.105388
Ruozhou Wang , Guiwen Chu , Jiankai Zhang , Runyuan Liu , Yixiang Wang , Lei Sun , Zichen Cao , Liying Song , Fubin Ma
The corrosion failure mechanism of Q235 steel under different stresses in simulated marine environment was investigated. The corrosion products of Q235 steel under different stresses are characterized. Additionally, electrochemical experiments and finite element simulations were conducted to examine the corrosion behavior of Q235 steel under various stress conditions. Stress promotes the corrosion failure of Q235 steel and accelerates the generation and transformation of corrosion products. Different stress levels lead to distinct stress corrosion mechanisms, with lower stress levels increasing sensitivity to corrosion. Elevated levels of stress result in stress concentration in dislocation defects, leading to more severe localized corrosion. A model for the evolution of stress corrosion failure has been established, revealing that the corrosion behavior at different stress levels is not strictly independent and can transition from low to high stress conditions under certain circumstances. Furthermore, it was observed that even at low stresses, there can be occurrences of stress concentrations leading to localized corrosion.
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引用次数: 0
期刊
International Journal of Pressure Vessels and Piping
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