International Journal of Pressure Vessels and Piping最新文献

英文中文

Parameter-mechanical properties regression model and fine grain strengthening phenomenon of Mg-9Al-Zn magnesium alloy weldments prepared by FSW

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-02-06 DOI: 10.1016/j.ijpvp.2025.105460

Kun Chen , Yuanpeng Liu , Guang Zeng , Zhenghe Wang , Meixin Ge , Kaixuan Li

The solid-state joining of Mg-9Al-Zn magnesium alloy under multi-parameter interaction was carried out by friction stir welding (FSW). A mathematical relationship between welding parameters and mechanical properties was established. The macro-micro detection was carried out by using laser scanning confocal microscope (LSCM) and scanning electron microscope energy dispersive spectrometer (SEM-EDS), and the mechanism of different parameters affecting the mechanical properties and microstructure evolution was revealed. The results indicate that the influence of welding parameters on the mechanical properties of the joint follows the order: "rotational speed > press-in volume > welding speed”. LSCM shows that there are obvious high-frequency vibration folds on the weld surface, which affect the fatigue resistance and corrosion resistance of the joint. Fine grain reinforcement is the main mechanism affecting weld mechanical properties, with weld hardness closely correlating with its size distribution trend. The morphology of the tensile fracture exhibited characteristics of quasi-cleavage fracture, with precipitated phases such as Al₆Mn and AlMnSi observed in the fracture area. A high welding speed accelerates the migration of silicon (Si) and promotes its accumulation at the edge of the stirring zone, which increases the brittleness of the alloy. At a rotational speed of 400 rpm, a welding speed of 70 mm/min, and a reduction of 0.15 mm, the precipitated phases of Al₆Mn and AlMnSi in the weld are evenly distributed, showing no Si accumulation. The fracture surface displays weak dimple characteristics, and the mechanical properties of the weld are optimized, reaching 146.15 % of the strength of the base metal.

{"title":"Parameter-mechanical properties regression model and fine grain strengthening phenomenon of Mg-9Al-Zn magnesium alloy weldments prepared by FSW","authors":"Kun Chen , Yuanpeng Liu , Guang Zeng , Zhenghe Wang , Meixin Ge , Kaixuan Li","doi":"10.1016/j.ijpvp.2025.105460","DOIUrl":"10.1016/j.ijpvp.2025.105460","url":null,"abstract":"<div><div>The solid-state joining of Mg-9Al-Zn magnesium alloy under multi-parameter interaction was carried out by friction stir welding (FSW). A mathematical relationship between welding parameters and mechanical properties was established. The macro-micro detection was carried out by using laser scanning confocal microscope (LSCM) and scanning electron microscope energy dispersive spectrometer (SEM-EDS), and the mechanism of different parameters affecting the mechanical properties and microstructure evolution was revealed. The results indicate that the influence of welding parameters on the mechanical properties of the joint follows the order: \"rotational speed > press-in volume > welding speed”. LSCM shows that there are obvious high-frequency vibration folds on the weld surface, which affect the fatigue resistance and corrosion resistance of the joint. Fine grain reinforcement is the main mechanism affecting weld mechanical properties, with weld hardness closely correlating with its size distribution trend. The morphology of the tensile fracture exhibited characteristics of quasi-cleavage fracture, with precipitated phases such as Al<sub>6</sub>Mn and AlMnSi observed in the fracture area. A high welding speed accelerates the migration of silicon (Si) and promotes its accumulation at the edge of the stirring zone, which increases the brittleness of the alloy. At a rotational speed of 400 rpm, a welding speed of 70 mm/min, and a reduction of 0.15 mm, the precipitated phases of Al<sub>6</sub>Mn and AlMnSi in the weld are evenly distributed, showing no Si accumulation. The fracture surface displays weak dimple characteristics, and the mechanical properties of the weld are optimized, reaching 146.15 % of the strength of the base metal.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105460"},"PeriodicalIF":3.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143377385","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

Experimental and numerical investigation of burst characteristics of ultra-high pressure rupture discs

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-02-06 DOI: 10.1016/j.ijpvp.2025.105455

Zhenxi Liu , Demin Zhou , Hui Xu , Yanlong Luo , Jianliang Yu , Xingqing Yan

Rupture discs, as a critical safety device in the chemical industry, are extensively employed in systems such as pressure vessels and pipelines for overpressure relief protection. This study addresses the issue of accidental rupture of ultra-high-pressure rupture discs in high-pressure polyethylene facilities by conducting stress analysis using the elastoplastic nonlinear finite element method. It reveals the stress characteristics of the rupture discs under real-world operational conditions and scenarios. Moreover, the accuracy of the model is validated by comparing the numerical simulation results with those from ultra-high-pressure rupture experiments. Both simulation and experimental results indicate that the discrepancies in burst pressure and post-burst arch height are controlled within approximately 5 %. By comprehensively simulating the pre-bulging, unloading, and pressurized bursting processes of the rupture disc, this paper analyzes the failure causes of the rupture discs from a mechanical perspective, introducing a new metric, the thickness thinning rate, to characterize the deformation extent of the rupture disc, with thickness thinning reaching nearly 50 % at the point of failure. Through multifactorial analysis of key parameters such as the clamp fillet radius, relief diameter, and plate thickness, the study further clarifies the effects of these parameters on burst pressure, and the peak stress and displacement at the pole. The research provides a scientific basis for the failure analysis and parameter optimization design of ultra-high-pressure rupture discs.

{"title":"Experimental and numerical investigation of burst characteristics of ultra-high pressure rupture discs","authors":"Zhenxi Liu , Demin Zhou , Hui Xu , Yanlong Luo , Jianliang Yu , Xingqing Yan","doi":"10.1016/j.ijpvp.2025.105455","DOIUrl":"10.1016/j.ijpvp.2025.105455","url":null,"abstract":"<div><div>Rupture discs, as a critical safety device in the chemical industry, are extensively employed in systems such as pressure vessels and pipelines for overpressure relief protection. This study addresses the issue of accidental rupture of ultra-high-pressure rupture discs in high-pressure polyethylene facilities by conducting stress analysis using the elastoplastic nonlinear finite element method. It reveals the stress characteristics of the rupture discs under real-world operational conditions and scenarios. Moreover, the accuracy of the model is validated by comparing the numerical simulation results with those from ultra-high-pressure rupture experiments. Both simulation and experimental results indicate that the discrepancies in burst pressure and post-burst arch height are controlled within approximately 5 %. By comprehensively simulating the pre-bulging, unloading, and pressurized bursting processes of the rupture disc, this paper analyzes the failure causes of the rupture discs from a mechanical perspective, introducing a new metric, the thickness thinning rate, to characterize the deformation extent of the rupture disc, with thickness thinning reaching nearly 50 % at the point of failure. Through multifactorial analysis of key parameters such as the clamp fillet radius, relief diameter, and plate thickness, the study further clarifies the effects of these parameters on burst pressure, and the peak stress and displacement at the pole. The research provides a scientific basis for the failure analysis and parameter optimization design of ultra-high-pressure rupture discs.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"215 ","pages":"Article 105455"},"PeriodicalIF":3.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143388242","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 novel wire arc additive manufactured process for 316L stainless steel for pressure vessel applications: Microstructure, mechanical properties and corrosion behaviour

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-02-03 DOI: 10.1016/j.ijpvp.2025.105457

Wenxuan Liu , Wenbiao Gong , Yupeng Li , Jiacheng Feng , Jinxin Liu , Qingchen Meng , Peng Lv

Wire Arc Additive Manufacturing (WAAM) offers unprecedented design freedom and manufacturing flexibility for producing large and complex components. Additive-assisted WAAM processes, including ultrasound, in-situ rolling, and stir-friction, offer certain advantages over traditional WAAM. Nevertheless, these technologies cannot eliminate the inherent costs associated with increased production. Thus, there is an urgent need for a low-cost and efficient production method. In this study, WAAM assisted by a rapid cooling device was employed to fabricate 316L stainless steel, comparing the effects of rapid cooling in constant-temperature water with natural air cooling on microstructure, mechanical properties, and corrosion resistance. The results demonstrate that rapid cooling improved productivity fivefold. Compared to WAAM, 24IRC-WAAM (24 °C interlayer rapid cooling-wire arc additive manufacturing) and 60IRC-WAAM (60 °C interlayer rapid cooling-wire arc additive manufacturing) exhibited average grain refinement of 70.31 % and 57.22 %, respectively, reducing the material's internal anisotropy and significantly enhancing both horizontal and vertical mechanical properties, as well as corrosion resistance. Studies further indicate that the preparation of 316L using arc additive manufacturing in water at 60 °C is a cost-effective process, with the mechanical properties and corrosion resistance of WAAM 316L being comparable to those of forged grades, making it suitable for pressure vessels that demand high corrosion resistance.

{"title":"A novel wire arc additive manufactured process for 316L stainless steel for pressure vessel applications: Microstructure, mechanical properties and corrosion behaviour","authors":"Wenxuan Liu , Wenbiao Gong , Yupeng Li , Jiacheng Feng , Jinxin Liu , Qingchen Meng , Peng Lv","doi":"10.1016/j.ijpvp.2025.105457","DOIUrl":"10.1016/j.ijpvp.2025.105457","url":null,"abstract":"<div><div>Wire Arc Additive Manufacturing (WAAM) offers unprecedented design freedom and manufacturing flexibility for producing large and complex components. Additive-assisted WAAM processes, including ultrasound, in-situ rolling, and stir-friction, offer certain advantages over traditional WAAM. Nevertheless, these technologies cannot eliminate the inherent costs associated with increased production. Thus, there is an urgent need for a low-cost and efficient production method. In this study, WAAM assisted by a rapid cooling device was employed to fabricate 316L stainless steel, comparing the effects of rapid cooling in constant-temperature water with natural air cooling on microstructure, mechanical properties, and corrosion resistance. The results demonstrate that rapid cooling improved productivity fivefold. Compared to WAAM, 24IRC-WAAM (24 °C interlayer rapid cooling-wire arc additive manufacturing) and 60IRC-WAAM (60 °C interlayer rapid cooling-wire arc additive manufacturing) exhibited average grain refinement of 70.31 % and 57.22 %, respectively, reducing the material's internal anisotropy and significantly enhancing both horizontal and vertical mechanical properties, as well as corrosion resistance. Studies further indicate that the preparation of 316L using arc additive manufacturing in water at 60 °C is a cost-effective process, with the mechanical properties and corrosion resistance of WAAM 316L being comparable to those of forged grades, making it suitable for pressure vessels that demand high corrosion resistance.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105457"},"PeriodicalIF":3.0,"publicationDate":"2025-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143369561","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

Corrigendum to ‘Theoretical and experimental research on the critical buckling pressure of the thin-walled metal liner installed in the composite overwrapped pressure vessel’ [Int. J. Press. Vessels Piping 212 (2024) 105335]

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-02-01 DOI: 10.1016/j.ijpvp.2024.105345

Pei Zhang , Fuwei Gu , Zhongliang Cao , Hao Wang , Zhiyang Chen , Hu Xiao , Xinkun Wang , Guoliang Ma

引用次数: 0

Transfer functions for thermoplastic composite pipes subjected toaxisymmetric mechanical and thermal loading

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-01-31 DOI: 10.1016/j.ijpvp.2025.105453

M.A. Vaz , P.L.A. Oliveira , M. Caire , Y. He , F. Liu

Thermoplastic composite pipes (TCPs) offer an ideal alternative to traditional nonbonded flexible and steel risers for deepwater applications, as their high specific strength, stiffness, and corrosion resistance provide significant advantages. In this paper, linear transfer functions are developed to present the response of TCPs exposed to axisymmetric loads (tension, internal and external pressures, and torque) and thermal loading. This approach allows, for any load combination, quick evaluation of strains, stresses and assumed failure criteria. Considering heat convection conditions, the stationary temperature distribution within the pipe is determined by solving the heat conduction equation along the wall. Moreover, the temperature-dependent material properties are considered in the thermo-mechanical analysis. A case study is performed to illustrate the application of the methodology proposed in this work, and the stress transfer functions caused by unitary mechanical loads and thermal load are presented. These functions enable rapid calculations while providing results equivalent to those of the complete thermo-mechanical analysis. Besides, the maximum load envelopes are evaluated based on Hashin and von Mises failure criteria which are respectively employed for the laminate and homogeneous layers. The validation of the proposed model is also demonstrated in the end.

{"title":"Transfer functions for thermoplastic composite pipes subjected toaxisymmetric mechanical and thermal loading","authors":"M.A. Vaz , P.L.A. Oliveira , M. Caire , Y. He , F. Liu","doi":"10.1016/j.ijpvp.2025.105453","DOIUrl":"10.1016/j.ijpvp.2025.105453","url":null,"abstract":"<div><div>Thermoplastic composite pipes (TCPs) offer an ideal alternative to traditional nonbonded flexible and steel risers for deepwater applications, as their high specific strength, stiffness, and corrosion resistance provide significant advantages. In this paper, linear transfer functions are developed to present the response of TCPs exposed to axisymmetric loads (tension, internal and external pressures, and torque) and thermal loading. This approach allows, for any load combination, quick evaluation of strains, stresses and assumed failure criteria. Considering heat convection conditions, the stationary temperature distribution within the pipe is determined by solving the heat conduction equation along the wall. Moreover, the temperature-dependent material properties are considered in the thermo-mechanical analysis. A case study is performed to illustrate the application of the methodology proposed in this work, and the stress transfer functions caused by unitary mechanical loads and thermal load are presented. These functions enable rapid calculations while providing results equivalent to those of the complete thermo-mechanical analysis. Besides, the maximum load envelopes are evaluated based on Hashin and von Mises failure criteria which are respectively employed for the laminate and homogeneous layers. The validation of the proposed model is also demonstrated in the end.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105453"},"PeriodicalIF":3.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143165591","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

Deformation response and microstructure evolution in 304LN stainless steel subjected to multiaxial fatigue loading under different strain paths

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-01-31 DOI: 10.1016/j.ijpvp.2025.105452

Adarsh Bharti , Rima dey , S. Sivaprasad , S. Tarafder , Abir Bhattacharyya

Axial-torsion low cycle fatigue (LCF) experiments were conducted on 304LN stainless steel under in-phase triangular (IPT), 90° out-of-phase triangular (OPT), 90° out-of-phase sinusoidal (OPS), and 90° out-of-phase trapezoidal (OPZ) loading paths with same applied axial strain (

ε

) and equivalent shear strain amplitude (

\frac{γ}{\sqrt{3}}

), to study the material's cyclic stress response (CSR) under each strain path and to further correlate the responses with dislocation substructure and martensite formation. The CSRs exhibited primary hardening followed by softening and a secondary hardening. Both primary and secondary hardening were found to increase, and the softening was found to decrease as per the following sequence IPT < OPT < OPS < OPZ. Electron backscattered diffraction (EBSD) revealed that both deformation-induced Martensite (DIM) fraction and Kernel average misorientation (KAM) increases in the same sequence for different paths, indicating the tendency of formation of DIM increases and the propensity of recovery decreases in the same order. The cyclic stress response and DIM formation under non-proportional loadings are rationalized by (i) higher non-proportionality of strain path for OPS than OPT for same equivalent strain amplitude, and (ii) greater equivalent strain amplitude in OPZ than OPS. A greater fraction of planes subjected to combined resolved shear and tensile stress under OPS path than OPT path leads to a greater DIM formation in the OPS path than OPT path, reflecting the effect of non-proportionality factor. A greater magnitude of resolved shear and normal strain, and high tensile normal stress causes higher DIM formation and hardening in the OPZ path as compared to OPS path, reflecting the effect of equivalent strain amplitude.

{"title":"Deformation response and microstructure evolution in 304LN stainless steel subjected to multiaxial fatigue loading under different strain paths","authors":"Adarsh Bharti , Rima dey , S. Sivaprasad , S. Tarafder , Abir Bhattacharyya","doi":"10.1016/j.ijpvp.2025.105452","DOIUrl":"10.1016/j.ijpvp.2025.105452","url":null,"abstract":"<div><div>Axial-torsion low cycle fatigue (LCF) experiments were conducted on 304LN stainless steel under in-phase triangular (IPT), 90° out-of-phase triangular (OPT), 90° out-of-phase sinusoidal (OPS), and 90° out-of-phase trapezoidal (OPZ) loading paths with same applied axial strain (<span><math><mrow><mi>ε</mi></mrow></math></span>) and equivalent shear strain amplitude (<span><math><mrow><mfrac><mi>γ</mi><msqrt><mn>3</mn></msqrt></mfrac></mrow></math></span>), to study the material's cyclic stress response (CSR) under each strain path and to further correlate the responses with dislocation substructure and martensite formation. The CSRs exhibited primary hardening followed by softening and a secondary hardening. Both primary and secondary hardening were found to increase, and the softening was found to decrease as per the following sequence IPT < OPT < OPS < OPZ. Electron backscattered diffraction (EBSD) revealed that both deformation-induced Martensite (DIM) fraction and Kernel average misorientation (KAM) increases in the same sequence for different paths, indicating the tendency of formation of DIM increases and the propensity of recovery decreases in the same order. The cyclic stress response and DIM formation under non-proportional loadings are rationalized by (i) higher non-proportionality of strain path for OPS than OPT for same equivalent strain amplitude, and (ii) greater equivalent strain amplitude in OPZ than OPS. A greater fraction of planes subjected to combined resolved shear and tensile stress under OPS path than OPT path leads to a greater DIM formation in the OPS path than OPT path, reflecting the effect of non-proportionality factor. A greater magnitude of resolved shear and normal strain, and high tensile normal stress causes higher DIM formation and hardening in the OPZ path as compared to OPS path, reflecting the effect of equivalent strain amplitude.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105452"},"PeriodicalIF":3.0,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143349037","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

Corrigendum to ‘Residual stress assessment for dissimilar metal welds in nuclear power plant’ [Int. J. Pres. Ves. Pip. Volume 206, December 2023, 105018]

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-01-30 DOI: 10.1016/j.ijpvp.2025.105435

Qingrong Xiong , Yongxiao Qu , Vincent Robin , Mike C. Smith

引用次数: 0

Digital twin based predictive diagnosis approach for submarine suspended pipelines

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-01-28 DOI: 10.1016/j.ijpvp.2025.105451

Fan Chen , Haotian Wei , Jiamin Tang , Weidong Sun , Xin Zhao , Yong Li , Shaohua Dong , Hang Zhang , Guanyi Liu

Subsea pipelines are vital to offshore oil and gas production systems, with submarine suspended pipelines being the most prone to accidents. Therefore, predictive diagnosis of these pipelines is critical. Traditional inspection methods, though widely studied, fail to offer long-term and multi-directional diagnosis. To address this, the paper introduces digital twins for enhanced predictive diagnosis. A unit-level digital twin framework for submarine suspended pipelines is proposed, leveraging digital twins' capabilities in real-time monitoring, failure prediction, and optimization. Predictive diagnosis, however, requires insights into the pipeline's future condition. Thus, a PFD-TCN (Polynomial Fitting Denoising Temporal Convolutional Network) model is introduced, combining TCN with a polynomial fitting function for noise reduction. This model reduces prediction error by over 50 % compared to traditional TCN models, significantly improving the accuracy of pipeline strain forecasting. Importing real-time and predictive data into the digital twin enables real-time tracking of pipeline dynamics and fault evolution, facilitating further diagnostic analysis within the twin framework. The integration of fault diagnosis and digital twins establishes a novel predictive diagnosis approach for subsea pipelines. In conclusion, the predictive diagnosis system can provide a guarantee for the safe production of offshore oil and gas.

{"title":"Digital twin based predictive diagnosis approach for submarine suspended pipelines","authors":"Fan Chen , Haotian Wei , Jiamin Tang , Weidong Sun , Xin Zhao , Yong Li , Shaohua Dong , Hang Zhang , Guanyi Liu","doi":"10.1016/j.ijpvp.2025.105451","DOIUrl":"10.1016/j.ijpvp.2025.105451","url":null,"abstract":"<div><div>Subsea pipelines are vital to offshore oil and gas production systems, with submarine suspended pipelines being the most prone to accidents. Therefore, predictive diagnosis of these pipelines is critical. Traditional inspection methods, though widely studied, fail to offer long-term and multi-directional diagnosis. To address this, the paper introduces digital twins for enhanced predictive diagnosis. A unit-level digital twin framework for submarine suspended pipelines is proposed, leveraging digital twins' capabilities in real-time monitoring, failure prediction, and optimization. Predictive diagnosis, however, requires insights into the pipeline's future condition. Thus, a PFD-TCN (Polynomial Fitting Denoising Temporal Convolutional Network) model is introduced, combining TCN with a polynomial fitting function for noise reduction. This model reduces prediction error by over 50 % compared to traditional TCN models, significantly improving the accuracy of pipeline strain forecasting. Importing real-time and predictive data into the digital twin enables real-time tracking of pipeline dynamics and fault evolution, facilitating further diagnostic analysis within the twin framework. The integration of fault diagnosis and digital twins establishes a novel predictive diagnosis approach for subsea pipelines. In conclusion, the predictive diagnosis system can provide a guarantee for the safe production of offshore oil and gas.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105451"},"PeriodicalIF":3.0,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164553","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

Evaluating critical SZW and its variation using curved CT specimens used in pressure tubes material testing of nuclear reactor

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-01-25 DOI: 10.1016/j.ijpvp.2025.105446

Sanjeev Saxena , Badal M. Pandharkar , Rahul Singh Sikarwar

In case of small thin pipes (R/t ≥ 10), such as pressure tubes in nuclear reactor, it is not possible to get flat standard fracture specimens. In such evaluation of initial fracture toughness and critical stretch zone width (SZWc) of the material, the effect of pre-strain which is included during straightening of the strip, the effect of curvature and the effect of using sub-size fracture specimen is not taken into account. Therefore, it is important to compare the SZWc variation and initiation fracture toughness evaluated using flat and curved fracture specimens.

In the present study, the effect of geometrical parameters of curved compact tension (CT) specimen (such as width, crack front direction, relative crack size and radius to thickness ratio) on the SZWc is studied. Using curved CT specimen, a measuring range (average of:1/8 to 3/8 times the specimen thickness towards concave side) is also suggested for the evaluation of SZWc, that will provide SZWc value evaluated using flat CT specimen.

{"title":"Evaluating critical SZW and its variation using curved CT specimens used in pressure tubes material testing of nuclear reactor","authors":"Sanjeev Saxena , Badal M. Pandharkar , Rahul Singh Sikarwar","doi":"10.1016/j.ijpvp.2025.105446","DOIUrl":"10.1016/j.ijpvp.2025.105446","url":null,"abstract":"<div><div>In case of small thin pipes (R/t ≥ 10), such as pressure tubes in nuclear reactor, it is not possible to get flat standard fracture specimens. In such evaluation of initial fracture toughness and critical stretch zone width (SZWc) of the material, the effect of pre-strain which is included during straightening of the strip, the effect of curvature and the effect of using sub-size fracture specimen is not taken into account. Therefore, it is important to compare the SZWc variation and initiation fracture toughness evaluated using flat and curved fracture specimens.</div><div>In the present study, the effect of geometrical parameters of curved compact tension (CT) specimen (such as width, crack front direction, relative crack size and radius to thickness ratio) on the SZWc is studied. Using curved CT specimen, a measuring range (average of:1/8 to 3/8 times the specimen thickness towards concave side) is also suggested for the evaluation of SZWc, that will provide SZWc value <strong>evaluated using</strong> flat CT specimen.</div></div>","PeriodicalId":54946,"journal":{"name":"International Journal of Pressure Vessels and Piping","volume":"214 ","pages":"Article 105446"},"PeriodicalIF":3.0,"publicationDate":"2025-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143164441","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

Microstructure and mechanical properties of TIG and TIG+ FCAW automatic welded joints of X70 pipeline steel at 45° slope

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2025-01-24 DOI: 10.1016/j.ijpvp.2025.105450

Jiahui Wen , Liying Li , Xuezhen Sheng , Fuwang Song , Bin Han , Xueda Li

Butting welding of X70 pipeline steel at 45° slope were conducted by automatic hot-wire tungsten inert gas arc welding (TIG), and automatic TIG + flux core arc welding (FCAW). Optical microscopy (OM) and scanning electron microscopy (SEM) were used to analyze the microstructures of two welded joints. Meanwhile, mechanical properties of two welded joints, such as tensile, bending, hardness and impact were measured. The results show that, for TIG + FCAW joint, the proportion of large-angle grain boundaries is greater than that of small-angle grain boundaries for the whole weld. For the HAZ of the both welded joints, the proportion of small-angle grain boundaries of the upper groove is higher than that of the lower groove. Both the grain size and hardness of the HAZ-upper is higher than that of the HAZ-lower. But the impact energy of the HAZ-lower is much higher than that of the HAZ-upper. Therefore, the slope affects the properties of welded joints. In addition, the temperature influences the impact energy. For TIG joint, the impact energy at room temperature (25 °C) is generally higher than that at −10 °C. For TIG + FCAW joint, the impact energy of both the HAZ at 3 o'clock and the fusion line at 6 o'clock at 25 °C is lower than that at −10 °C. In view of the high strength and good toughness of the TIG + FCAW joint, TIG + FCAW welding process is more suitable for X70 pipeline steel welding.

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