Procedia Structural Integrity最新文献_第5页

Numerical Analysis of Tensile Behavior of Stainless Steel SS304 With Corrosion Pits 带腐蚀坑的SS304不锈钢拉伸性能数值分析

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.08.042

Poshadri Chathri, Raghu V Prakash

{"title":"Numerical Analysis of Tensile Behavior of Stainless Steel SS304 With Corrosion Pits","authors":"Poshadri Chathri, Raghu V Prakash","doi":"10.1016/j.prostr.2025.08.042","DOIUrl":"10.1016/j.prostr.2025.08.042","url":null,"abstract":"<div><div>Pitting corrosion is one of the leading causes of structural failure in marine and aerospace applications, as fracture initiates from the pits. The pitting phenomenon is one of the less predictable forms of corrosion; it is a localized corrosion of a metal surface where small areas corrode preferentially, leading to the formation of cavities or pits. In this study, numerical simulations are performed on an austenitic stainless steel (SS 304) dog-bone specimen of a thickness of 6 mm with spherical pits and different shapes of pits as per the ASTM G46-21 standard, as well as with different aspect ratios of pits. The pits were placed either in-line with the loading direction and different orientations, apart from random position of corrosion pits. It was observed that there is a reasonable decrease in the toughness of the sample with pits compared to no-pit conditions. The inline orientation of pits is found to be more harmful than the random orientation of pits, as the decrease in strength and stiffness is more. The different-shaped pits will initiate the failure faster than the identical (spherical) pits. In comparing inline and random orientations, for all aspect ratios and orientations, the highest tensile force is observed for pits with a random orientation and an aspect ratio of 1.76, while the minimum force is seen in spherical pits with a random orientation and an aspect ratio of 1.56. As the aspect ratio increased, strength initially decreased and then increased. Pits with a 1.76 aspect ratio showed greater strength and toughness, whereas the 1.56 ratio demonstrated poor performance. The spherical pits have a lower stress concentration factor (SCF) than different shapes of pits. Random orientation of pits with an aspect ratio of 1.76 had the highest SCF of 3.508, while spherical pits with an inline orientation and a 0.69 aspect ratio exhibit the lowest SCF of 2.866. As the aspect ratio increases, there is a corresponding increase in SCF across all pit shapes and orientations.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"71 ","pages":"Pages 309-316"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Orthotropic Mechanical Behavior of 3D Printed Ceramics: Experimental Analysis and Testing 3D打印陶瓷的正交各向异性力学行为：实验分析与测试

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.104

A. Jiménez , B. Hortigón , E. Vázquez , C. Rivera , C. Galán

{"title":"Orthotropic Mechanical Behavior of 3D Printed Ceramics: Experimental Analysis and Testing","authors":"A. Jiménez , B. Hortigón , E. Vázquez , C. Rivera , C. Galán","doi":"10.1016/j.prostr.2025.06.104","DOIUrl":"10.1016/j.prostr.2025.06.104","url":null,"abstract":"<div><div>3D printing with clay using Liquid Deposition Modelling has garnered significant attention, particularly in the construction industry, for fabricating ceramic and non-sintered elements. While previous studies have investigated the mechanical properties of 3D-printed ceramics, a comprehensive characterization of this material as a composite-like structure exhibiting orthotropic behavior, induced by the printing process, is still lacking. Such characterization is essential for developing finite element models to simulate the behavior of complex surfaces printed with parallel traces.</div><div>To address this gap, clay specimens were 3D-printed with varying trace orientations, sintered at 980°C, and tested for flexural and compressive strength in the X, Y, and Z directions using three-point bending and compression tests. Ultrasonic testing was also conducted to evaluate its potential for determining mechanical properties and structural integrity. This study provides foundational insights into the mechanical behavior of 3D-printed ceramics, paving the way for further advancements in their applications.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 603-609"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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The Two-parameter Fracture Criterion with Two-dimensional Crack Tip Front Constraint 二维裂纹尖端前沿约束的双参数断裂准则

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.109

Yu.G. Matvienko , A.M. Pokrovskii

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Improvement In Fatigue Properties Of Welded Joints Using Crack Initiation Resistant Steel Part 1: Fatigue Strength Of Weld Heat Affected Zone And Cruciform Fillet Welded Joints 抗裂钢焊接接头疲劳性能的改善。第1部分：焊缝热影响区和十字形角焊接头的疲劳强度

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.076

Takanori Ito , Yasuhito Takashima , Masao Kinefuchi

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Regularities of fatigue crack initiation and growth in two-phases titanium alloy after beach mark formation under VHCF regime VHCF条件下两相钛合金滩痕形成后疲劳裂纹萌生与扩展规律

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.081

Shanyavskiy A. , Nikitin A. , Nikitin I.

引用次数: 0

Comparative Study of Fatigue Behavior and Microstructural Evolution in As-Built and Heat-Treated Additively Manufactured 316L Stainless Steel 增材制造316L不锈钢的疲劳行为和显微组织演变比较研究

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.083

Atef Hamada , Matias Jaskari , Walaa Abd-Elaziem , Tarek Allam , Antti Järvenpää

{"title":"Comparative Study of Fatigue Behavior and Microstructural Evolution in As-Built and Heat-Treated Additively Manufactured 316L Stainless Steel","authors":"Atef Hamada , Matias Jaskari , Walaa Abd-Elaziem , Tarek Allam , Antti Järvenpää","doi":"10.1016/j.prostr.2025.06.083","DOIUrl":"10.1016/j.prostr.2025.06.083","url":null,"abstract":"<div><div>This study investigates the influence of heat treatment (HT) at 900 °C on the fatigue resistance of 316L stainless steel fabricated through selective laser melting (SLM). Fully reversed, force-controlled fatigue tests were conducted on both as-built (AB) and HTed specimens to assess their cyclic deformation behavior and fatigue life. The fatigue fracture mechanisms were analyzed through detailed microstructural characterization using secondary electron imaging in a scanning electron microscope (SEM) and laser scanning confocal microscope LSCM. Results show that the HT 316L exhibited improved fatigue resistance and a longer fatigue life compared to the AB 316L. Fatigue cracking along dendritic columnar grains and the formation of slip bands were identified as key microstructural features in both AB and HT materials. In the AB material, the columnar dendritic grains and cellular substructure appear to create weak points at grain boundaries, facilitating fatigue crack initiation due to localized strain in persistent slip bands. However, HT at 900 °C effectively reduced the cellular substructure, promoting the formation of high-angle grain boundaries, which significantly enhanced the fatigue resistance of HT 316L.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 465-471"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A New Design for Mitigating Interfering Modes in Cruciform Specimens to Enhance Ultrasonic Fatigue Testing 减轻十字形试样干涉模态的新设计以提高超声疲劳测试

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.084

Diogo Montalvão , Sina Safari , Weston Chidzikwe , Phil Sewell , Pedro Costa , Luís Reis , Manuel Freitas

{"title":"A New Design for Mitigating Interfering Modes in Cruciform Specimens to Enhance Ultrasonic Fatigue Testing","authors":"Diogo Montalvão , Sina Safari , Weston Chidzikwe , Phil Sewell , Pedro Costa , Luís Reis , Manuel Freitas","doi":"10.1016/j.prostr.2025.06.084","DOIUrl":"10.1016/j.prostr.2025.06.084","url":null,"abstract":"<div><div>Cruciform specimens have been extensively used to simulate biaxial loading conditions in Ultrasonic Fatigue Testing (UFT), particularly within the Very High Cycle Fatigue (VHCF) regime. However, these specimens are often affected by interference from unintended flexural modes, such as the ‘flapping mode,’ which occur at frequencies near the desired axial mode, compromising the accuracy and reliability of the tests. To address this issue, a new specimen design has been developed to effectively separate the axial and flexural modes, thereby transforming the precision of fatigue testing. Finite Element Analysis (FEA) and experimental validation using Digital Image Correlation (DIC) were employed to optimise the geometry of the specimens, resulting in a substantial frequency separation between the interfering flexural modes and the axial mode. Through this redesign, mode coupling has been virtually eliminated, ensuring that the specimens deform as intended during testing. This breakthrough enables in-plane biaxial testing across the full range of biaxiality ratios, overcoming the previous challenges posed by mode coupling. Equibiaxial in-phase biaxial UFT with this type of cruciform specimen, previously considered largely theoretical in its practical application, has now been successfully realised through the innovations presented in this work.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 472-479"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580414","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Optimization of TMCP parameters to improve the mechanical properties of 201LN stainless steel for cryogenic applications 优化TMCP参数，提高低温应用201LN不锈钢的力学性能

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.091

Ahmed W. Abdelghany , Sumit Ghosh , Tun Tun Nyo , Ali Smith , Frank Hoffmann , Marta Muratori , Mahesh Somani

{"title":"Optimization of TMCP parameters to improve the mechanical properties of 201LN stainless steel for cryogenic applications","authors":"Ahmed W. Abdelghany , Sumit Ghosh , Tun Tun Nyo , Ali Smith , Frank Hoffmann , Marta Muratori , Mahesh Somani","doi":"10.1016/j.prostr.2025.06.091","DOIUrl":"10.1016/j.prostr.2025.06.091","url":null,"abstract":"<div><div>The study aims to optimise thermo-mechanically controlled processing (TMCP) parameters for 201LN stainless steel to achieve improved yield and tensile strengths, alongside excellent ductility, toughness, and fatigue properties. A 201LN alloy ingot (5.4 wt.% Ni and 7.0 wt.% Mn) was vacuum-cast and hot rolled into thick plates. Cylindrical samples were machined for uniaxial, two-step hot compression tests using a Gleeble simulator under six distinct TMCP schedules. The second step deformation was performed in the no-recrystallization regime at 850–1000 °C, followed by fast cooling to prevent precipitation and sensitization. Microstructural evolution was analysed using confocal laser scanning microscopy (CLSM) and Vickers hardness testing. Image analysis quantified grain size and distribution, revealing pancaked grain structures that contributed to dislocation or substructure strengthening. Hardness decreased with increasing second-step deformation temperature, with the highest values observed at 850 °C and 900 °C, showing increases of 55% and 45%, respectively, over the annealed condition. These findings demonstrate that TMCP enables tailored microstructures and properties in 201LN steel.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 520-526"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580421","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Anisotropy of gyroid and stochastic lattice structures under axial loading 轴向载荷作用下的陀螺和随机晶格结构的各向异性

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.106

Antti Järvenpää , Miguel Araya Calvo , Timo Rautio

{"title":"Anisotropy of gyroid and stochastic lattice structures under axial loading","authors":"Antti Järvenpää , Miguel Araya Calvo , Timo Rautio","doi":"10.1016/j.prostr.2025.06.106","DOIUrl":"10.1016/j.prostr.2025.06.106","url":null,"abstract":"<div><div>Lattice structures are an interesting possibility to tailor the strength-weight ratio and elasticity of metallic structures. In this study, Ti6Al4V gyroid and stochastic lattice structures with relative densities from 0.1 to 0.5 were manufactured by laser powder bed fusion technology, and the created structures were tested both under monotonic tension and compression to determine the strength properties and Young’s modulus.</div><div>The study showed clear differences in anisotropy between the gyroid and stochastic lattice structures. In general, the anisotropy in the yield strength (YS) was higher in stochastic lattices, but the ratio between compression and tensile YS remained at 1.25 for all the studied densities. Higher variation was seen with gyroid lattices showing a ratio from 1.00–1.23 depending on the density. Gyroid structures were also stronger in strength, and superior strength levels were observed in comparison to the values found in the literature. The anisotropy in Young’s modulus (E) was high and significant differences were observed with different densities, but the trend between the gyroid and stochastic structures was similar. Interestingly, the ratio between compression and tensile Young’s modulus decreased by increasing the density, being close to 0.5 at 0.44 g/cm3 and 0.15 at 2.2 g/cm3. The measured E values were low, making them an especially promising solution for medical bone replacements.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 619-625"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580793","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The study of critical defects in selective laser melting material under very high cycle fatigue loading 高周疲劳载荷下选择性激光熔化材料临界缺陷的研究

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.018

Ilia Nikitin , Alexander Nikitin , Andrey Shanyavskiy , Boris Stratula

{"title":"The study of critical defects in selective laser melting material under very high cycle fatigue loading","authors":"Ilia Nikitin , Alexander Nikitin , Andrey Shanyavskiy , Boris Stratula","doi":"10.1016/j.prostr.2025.06.018","DOIUrl":"10.1016/j.prostr.2025.06.018","url":null,"abstract":"<div><div>This paper focuses on the fatigue behaviour of materials produced by selective laser melting. It highlights that internal defects or structural imperfections serve as potential fatigue crack initiation sites. The role of internal imperfections of microstructure becomes more pronounced in the very high cycle fatigue regime. The study is focused on the numerical simulations of the selected laser melting process to discover the nature, shape and distribution of typical defects based on laser beam parameters and scanning strategies. The non-linear heat conductivity problem with a moving phase boundary is solved for both single and multiple laser tracks. The problem is formulated in enthalpy terms. Two primary types of defects are discovered: not-melted zones and re-melted zones. These types of defects are simulated in the computer aided model of a very high cycle fatigue specimen. The not-melted zones are associated with localized regions of reduced elastic modulus, whereas the re-melted zones are associated with regions of slightly elevated values of elastic modulus. Fatigue life predictions, performed using multi regime fatigue fracture model, show a significant difference in fatigue life between specimens containing not-melted and re-melted defects. Under identical loading condition, the fatigue life of specimen with not-melted defects is about 10 times shorter compared to homogeneous material.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 24-31"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580763","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0