Procedia Structural Integrity最新文献_第7页

Methods of jump-like modeling of the discontinuous yield of AMg6 aluminum alloy AMg6 铝合金不连续屈服的跳跃式建模方法

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.039

Oleh Yasniy , Sergiy Fedak , Iryna Didych , Sofia Fedak , Nadiya Kryva

{"title":"Methods of jump-like modeling of the discontinuous yield of AMg6 aluminum alloy","authors":"Oleh Yasniy , Sergiy Fedak , Iryna Didych , Sofia Fedak , Nadiya Kryva","doi":"10.1016/j.prostr.2024.04.039","DOIUrl":"https://doi.org/10.1016/j.prostr.2024.04.039","url":null,"abstract":"<div><p>Various approaches for studying the jump-like deformation of AMg6 aluminum alloy are being compared. AMg6 alloy is characterized by instantaneous deformation increases during uniaxial stretching in the area of plasticity. It was assumed that the process of jump-like tensile deformation is caused by the cracking of dispersoids in the volume of the material. Based on that assumption, the methods that predict the initiation and magnitude of jump-like deformation depending on the proportion of destroyed inclusions were proposed. In particular, the ANSYS software complex was used to predict jump-like deformation, in which the groups of finite element models were developed to determine the main patterns of influence of structural heterogeneity parameters of the simulated environment on the stress-strain state. In addition, given the large amount of experimental data, it is important to learn how to solve such problems using machine learning (ML), particularly neural networks. It has been established that the prediction accuracy by one of the most common ML methods, that was neural networks, comprised more than 90%.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"59 ","pages":"Pages 271-278"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S245232162400355X/pdf?md5=56b9e7b5f5409cec3dd5de13b194d779&pid=1-s2.0-S245232162400355X-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141250266","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A tactic of two-side estimates of limiting bending loads for plates with contact cracks 接触裂缝板材极限弯曲载荷的双面估算策略

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.035

Ivan Shatskyi, Taras Dalyak, Mykola Makoviichuk, Vasyl Perepichka

{"title":"A tactic of two-side estimates of limiting bending loads for plates with contact cracks","authors":"Ivan Shatskyi, Taras Dalyak, Mykola Makoviichuk, Vasyl Perepichka","doi":"10.1016/j.prostr.2024.04.035","DOIUrl":"https://doi.org/10.1016/j.prostr.2024.04.035","url":null,"abstract":"<div><p>The problem of plate bending, weakened by rectilinear through crack, taking into account the contact of defect faces is considered. A detailed analysis of the analytical solution obtained previously by the classical theories of the plates within the framework of a model of crack closure along the line is performed. According to the data for intensity factors of forces and moments, the distribution of stress intensity factor across the plate thickness has been restored. We pay particular attention to the problem of determining the value of the fracture bending load. Process of propagation of the crack with non-uniformly stressed front in conditions of bending consists of two stages: irregular over its thickness consistent growth of the crack when load reaches its lower limiting value and unstable propagation of the crack when load reaches its upper limiting value. Analytical estimates of such limiting values are made using of the force and energy criteria of linear mechanics of fracture. The authors’ experience with the determine the limiting bending loads for some contact cracks systems in infinite and semi-infinite plate sis illustrated too.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"59 ","pages":"Pages 246-252"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624003512/pdf?md5=4dd93398ad8e837b1e86da3e2707ba6f&pid=1-s2.0-S2452321624003512-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141250291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study of the degradation of steel sewer structures of long-term operation 长期运行的钢制下水道结构退化研究

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.055

V. Makarenko , V. Lazoryk , V. Hots , S. Maksimov , Yu. Makarenko

{"title":"Study of the degradation of steel sewer structures of long-term operation","authors":"V. Makarenko , V. Lazoryk , V. Hots , S. Maksimov , Yu. Makarenko","doi":"10.1016/j.prostr.2024.04.055","DOIUrl":"https://doi.org/10.1016/j.prostr.2024.04.055","url":null,"abstract":"<div><p>Experimental studies of the influence of harmful elements (hydrogen, sulphur, oxygen) on the degradation of structural steels of underground sewer systems and the nature of their distribution in the metal of pipelines operated for a long time in aggressive environments have been carried out. It is shown that with an increase in the service life, the surface layers of the metal are enriched by hydrogen, oxygen and sulfur, adversely affecting the metal’s corrosion-mechanical properties. Combined with structural transformations, this leads to local metal embrittlement and, under favourable conditions (under alternating cyclic loads), to the formation of micropores, the coagulation of which leads to crack formation. An increase in the service life of sewage steel pipe structures leads to an increase in the values of the parameter of the body-centred cubic crystal lattice of the α-solid solution and an increase in microstresses in the structure. At the same time, part of the carbon from the decomposed cementite passes to the interface of the α-matrix. The second part, apparently, remains on dislocations, turning into microcracks, and also goes to the formation of new finely dispersed carbide particles; relatively large carbide particles form at the grain boundaries between pearlite and ferrite.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"59 ","pages":"Pages 385-390"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624003718/pdf?md5=112e2999dc2d2937c0613dfdb1a75258&pid=1-s2.0-S2452321624003718-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141250767","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 the work of continuous perforated beams near intermediate supports 中间支撑附近连续穿孔梁的施工特点

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.067

Volodymyr Romanіuk , Leonid Bezniuk , Volodymyr Supruniuk , Oleksandr Kononchuk , Olga Meshcheryakova , Andrii Sorochak

{"title":"Features of the work of continuous perforated beams near intermediate supports","authors":"Volodymyr Romanіuk , Leonid Bezniuk , Volodymyr Supruniuk , Oleksandr Kononchuk , Olga Meshcheryakova , Andrii Sorochak","doi":"10.1016/j.prostr.2024.04.067","DOIUrl":"https://doi.org/10.1016/j.prostr.2024.04.067","url":null,"abstract":"<div><p>The stress-strain state data for various types of intermediate supports in two-span continuous perforated beams were obtained through calculations using the finite element method within the \"Lira\" software complex. The calculations were performed under the influence of a symmetrical evenly distributed load applied across the spans. It was determined that the design of the intermediate support has minimal influence on the magnitude of maximum deflections and stresses within the beam span. However, it somewhat changes the nature of its operation, especially in the case of using a support part without transverse stiffeners and with unwelded holes to the left and right of the axis of the support. The maximum normal stresses were observed at the characteristic design point of the cross-section with the hole in the supporting part of the beam, specifically without the stiffening rib and with unwelded holes on both sides of the support. Additionally, comparable stress values were noted with the inclusion of stiffeners, albeit still with unwelded holes. In all cases, these stresses remain below the calculated yield point resistance of the steel. The inclusion of welded holes and support stiffeners proves beneficial in enhancing the performance of the support components. This is attributed to a significant reduction in the concentration of both tangential and normal stresses, despite stress values in all scenarios remaining below the calculated resistance of steel.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"59 ","pages":"Pages 471-478"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624003834/pdf?md5=6b6bb0111e9ada39cdf140e0c4d509db&pid=1-s2.0-S2452321624003834-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141250779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Hydrogen Concentration in Metal on Residual Durability of Defected Pipelines 金属中的氢浓度对有缺陷管道剩余耐久性的影响

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.012

Ihor Dmytrakh, Andriy Syrotyuk, Oksana Hembara, Mykhailo Hrynenko

{"title":"Effect of Hydrogen Concentration in Metal on Residual Durability of Defected Pipelines","authors":"Ihor Dmytrakh, Andriy Syrotyuk, Oksana Hembara, Mykhailo Hrynenko","doi":"10.1016/j.prostr.2024.04.012","DOIUrl":"https://doi.org/10.1016/j.prostr.2024.04.012","url":null,"abstract":"<div><p>This study is devoted to the determination of the effect of hydrogen concentration in metal <em>C</em><sub>H</sub> on the residual durability <em>N<sub>f</sub></em> of defected pipelines. Three different cases of defected pipes were considered, namely: pipe with longitudinal semi-elliptical crack at outer surface; pipe with longitudinal semi-elliptical crack at inner surface and pipe with circumferential semi-elliptical crack at inner surface. It has been shown that the presence of the crack-like defects in the pipelines is very dangerous from the point of view of their further reliable operation. This danger significantly increases with the increase of the hydrogen concentration in the metal. The increase of the danger of crack-like defects in the pipes may be expressed by the sequence: longitudinal semi-elliptical crack at outer surface – longitudinal semi-elliptical crack at inner surface – circumferential semi-elliptical crack at inner surface. The residual durability of defected pipe <em>N<sub>f</sub></em> was chosen as the basic parameter for the assessment of its further serviceability. Thus, all defects detected in the pipeline after inspection can be compared with received data and on this base the expert conclusion for the evaluation of the potential risk of each defect can be made.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"59 ","pages":"Pages 74-81"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624003226/pdf?md5=f141c9ed43b569899052c908d76c3a26&pid=1-s2.0-S2452321624003226-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141249959","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hydrogen role in strain aging of low alloy steels under operation 氢在低合金钢工作状态下的应变时效中的作用

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.013

Hryhoriy Nykyforchyn , Oleksandr Tsyrulnyk , Oleh Venhryniuk , Olha Zvirko , Oleksandra Student , Ihor Dzioba , Dmytro Demianchuk

{"title":"Hydrogen role in strain aging of low alloy steels under operation","authors":"Hryhoriy Nykyforchyn , Oleksandr Tsyrulnyk , Oleh Venhryniuk , Olha Zvirko , Oleksandra Student , Ihor Dzioba , Dmytro Demianchuk","doi":"10.1016/j.prostr.2024.04.013","DOIUrl":"https://doi.org/10.1016/j.prostr.2024.04.013","url":null,"abstract":"<div><p>Strain aging of structural steels is generally considered as an important factor in their embrittlement. In the laboratory, it is initiated by preliminary plastic deformation of a metal for the generation of dislocations, followed by short-term heating. In the study, a new hypothesis about the possibility of strain ageing occurring without any initial plastic deformation at the micro-scale under the presence of hydrogen in the process that induces internal stresses in steel was proposed. It was presumed that areas with local plastic deformation induced by hydrogen would be the preferred locations for steel to undergo strain aging during subsequent heating. This assumption was substantiated through experimental tests using the low-alloy pipe steel in different states (as-delivered state, after low-temperature tempering and after preliminary electrochemical hydrogen charging followed by low-temperature tempering). The mechanical properties of the steel, including strength, plasticity, impact strength, fracture toughness, and resistance to stress corrosion cracking, were assessed. Low-temperature tempering did not affect the mechanical behaviour of the steel. However, the steel subjected to the procedure of combining preliminary hydrogen charging with subsequent low-temperature tempering was characterized by a significant decrease in fracture toughness and resistance to stress corrosion cracking. Hydrogen had an impact on the embrittlement of the steel through the strain aging at local sites being preferable for hydrogen diffusion.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"59 ","pages":"Pages 82-89"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624003238/pdf?md5=e8f702063b0a3d20974614ba57899cc4&pid=1-s2.0-S2452321624003238-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141249971","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Propagation of high-temperature creep cracks in metals under the influence of hydrogen and neutron irradiation 氢和中子辐照影响下金属高温蠕变裂纹的扩展

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.027

Oleksandr Andreykiv , Iryna Dolinska , Sviatoslav Nastasiak , Orest Svirchevskyi

引用次数: 0

Prospects of using metallic nanocoatings to improve the operational characteristics of welded joints 使用金属纳米涂层改善焊接接头操作特性的前景

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.041

Liubomyr Poberezhnyi , Sylvia Kessler , Marcus Rutner , Niclas Spalek , Igor Okipnyi

引用次数: 0

Determination of safety indicators of the freight wagons by mobile systems 通过移动系统确定货车的安全指标

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.04.073

O. Fomin , P. Prokopenko , Y. Medvediev , L. Degtyareva

{"title":"Determination of safety indicators of the freight wagons by mobile systems","authors":"O. Fomin , P. Prokopenko , Y. Medvediev , L. Degtyareva","doi":"10.1016/j.prostr.2024.04.073","DOIUrl":"https://doi.org/10.1016/j.prostr.2024.04.073","url":null,"abstract":"<div><p>The organization of the movement of freight trains in Ukraine is an important factor in integrating the country’s railway transport into the European system. A situation that requires a significant renewal of the freight wagon park with modern wagons to meet the freight transportation requirements has arisen. Also, a significant drawback of railway transport in Ukraine is the limitation of the speed of trains, which include freight wagons with a reduced container in an empty state, therefore, at the moment, the issue of improving the methodological and software and instrumental testing tools for evaluating the quality and safety indicators of the movement of such wagons is relevant at the moment. At present, laboratory wagons are used during field tests related to the evaluation of traffic quality indicators, acceptance and admission to operation of railway rolling stock, but the modern state of development of measuring equipment allows in most cases to abandon the use of such wagons during running tests of units rolling stock in favor of mobile hardware and software complexes.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"59 ","pages":"Pages 516-522"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624003895/pdf?md5=a170528dba3fb8b8a8929dadabc5cd59&pid=1-s2.0-S2452321624003895-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141250687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrosion resistance and other utility properties of selected austenitic nodular cast irons 某些奥氏体球墨铸铁的耐腐蚀性和其他实用特性

Procedia Structural Integrity Pub Date : 2024-01-01 DOI: 10.1016/j.prostr.2024.05.009

Alan Vaško , Viera Zatkalíková , Juraj Belan , Milan Uhríčik , Václav Kaňa

{"title":"Corrosion resistance and other utility properties of selected austenitic nodular cast irons","authors":"Alan Vaško , Viera Zatkalíková , Juraj Belan , Milan Uhríčik , Václav Kaňa","doi":"10.1016/j.prostr.2024.05.009","DOIUrl":"https://doi.org/10.1016/j.prostr.2024.05.009","url":null,"abstract":"<div><p>This study deals with the evaluation of corrosion resistance and other utility properties of selected austenitic nodular cast irons and their comparison with other (non-austenitic) nodular cast irons. For the investigations, two types of austenitic nodular cast iron were selected: nickel-manganese nodular cast iron EN-GJSA-XNiMn13-7 and nickel-chromium nodular cast iron EN-GJSA-XNiCr20-2. Basic mechanical properties, such as yield strength, tensile strength, elongation, absorbed energy and hardness, were evaluated using mechanical tests. The fatigue limit was determined using low-frequency fatigue tests. Corrosion properties, such as average corrosion rate, corrosion potential and corrosion current density, were determined by the exposure immersion test and the electrochemical potentiodynamic polarisation test. Both corrosion tests were performed in a 3.5% NaCl solution (to simulate seawater) at room temperature. The results of mechanical, fatigue and corrosion tests show that austenitic nodular cast irons have lower strength and fatigue properties but significantly higher plastic properties and corrosion resistance compared to non-austenitic nodular cast irons.</p></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"58 ","pages":"Pages 48-53"},"PeriodicalIF":0.0,"publicationDate":"2024-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2452321624004384/pdf?md5=699fb8f6eedf4e77036aa4f5ff757c4b&pid=1-s2.0-S2452321624004384-main.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141242253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0