Procedia Structural Integrity最新文献

Modelling the properties of shape memory alloys using machine learning methods 利用机器学习方法对形状记忆合金的性能进行建模

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.033

Oleh Yasniy , Dmytro Tymoshchuk , Iryna Didych , Volodymyr Iasnii , Iaroslav Pasternak

引用次数: 0

Fatigue life predictions of notched samples based on average strain energy density 基于平均应变能密度的缺口试样疲劳寿命预测

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.112

Jan Klusák , Kamila Kozáková

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Acceleration and deceleration of unzipping supershear fracture propagating along a straight perforation line consisting of small-scale cracks 解压缩超剪切裂缝沿由小裂缝组成的直射孔线扩展的加速和减速

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.096

Koji Uenishi , Kaichi Akimoto , Masanao Sekine

{"title":"Acceleration and deceleration of unzipping supershear fracture propagating along a straight perforation line consisting of small-scale cracks","authors":"Koji Uenishi , Kaichi Akimoto , Masanao Sekine","doi":"10.1016/j.prostr.2025.06.096","DOIUrl":"10.1016/j.prostr.2025.06.096","url":null,"abstract":"<div><div>We experimentally investigate two-dimensional dynamic fracture propagation along a straight perforation line containing multiple small-scale cracks. If there exists only one single perforation line in a brittle polycarbonate specimen, dynamic fracture due to application of external quasi-static loading seems propagating unidirectionally in an “unzipping” way along the perforation line, simply linking the edges of the cracks without diverting and branching. However, a closer look into the photographs experimentally obtained by a high-speed video camera shows that fracture propagation is not always unidirectional and its speed also fluctuates back-and-forth between subsonic and supershear levels, i.e. the speed can be lower or higher than the relevant shear wave speed of the specimen during propagation. Generally, the propagation speed becomes maximum just before the fracture leaves the edge of a preexisting small-scale crack and it is low just before the fracture approaches the edge of the next crack in the perforation line. Furthermore, the fluctuation of fracture propagation speed at supershear levels may generate multiple Mach (shock) wavefronts with different Mach angles.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 554-558"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580322","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

On the mechanisms for surface and bulk embrittlement of AA2024 and AA2198 aluminium alloys, following hydrogen exposure 氢暴露对AA2024和AA2198铝合金表面和体脆的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.065

R.J. Mostert , C.C.E. Pretorius , C-M Charalampidou , N. Alexopoulos

{"title":"On the mechanisms for surface and bulk embrittlement of AA2024 and AA2198 aluminium alloys, following hydrogen exposure","authors":"R.J. Mostert , C.C.E. Pretorius , C-M Charalampidou , N. Alexopoulos","doi":"10.1016/j.prostr.2025.06.065","DOIUrl":"10.1016/j.prostr.2025.06.065","url":null,"abstract":"<div><div>In order to investigate the mechanism of embrittlement of two high-strength aluminium alloys, AA2024-T3 and AA2198-T8, a number of tensile and compact tension specimens were subjected to two hours of immersion in an exfoliation corrosion (EXCO) solution. Some of these samples had previously been subjected to different levels of pre-stretching, before immersion. It was found that, for the Al-Cu-Li alloy AA2198, a maximum of tensile embrittlement was observed at a low pre-stretching level of 1.5 %. At this level, a maximum was also observed with regard to the surface crack density observed, following testing. The surface cracking was shallow and intergranular, but the primary fracture surfaces were found to be ductile with multi-void coalescence. Scanning electron microscopy work demonstrated that, following EXCO exposure, a thin (~ 100 µm) subsurface layer of intergranular attack was present. A degassing heat treatment significantly reduced the diffusible hydrogen, but the intergranular surface cracking remained. A mechanism is proposed to explain the embrittlement observed both on the surfaces and in the bulk of the alloys.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 351-357"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580335","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

Rice husk ash reduces damage rate of CEB under uniaxial compression 稻壳灰降低了单轴压缩下CEB的损伤率

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.070

Marian Valenzuela , Víctor Tuninetti , Gustavo Ciudad , Shady Attia

引用次数: 0

Root Cause Failure Analysis of a 9Cr-1Mo tube in the CCR Unit of an Oil Refinery 炼油厂CCR装置9Cr-1Mo管失效的根本原因分析

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.074

Reza Khadem Hosseini

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The microstructure and fracture mode of physically simulated heat-affected zones of a weld metal used with 500 MPa offshore steel – part 1: impact toughness test results 500mpa海上用钢焊接金属热影响区的物理模拟显微组织和断裂模式。第1部分：冲击韧性试验结果

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.088

Marcell Gáspár , Judit Kovács , Henri Tervo , Antti Kaijalainen , Vahid Javaheri , Johannes Sainio , Jukka Kömi

{"title":"The microstructure and fracture mode of physically simulated heat-affected zones of a weld metal used with 500 MPa offshore steel – part 1: impact toughness test results","authors":"Marcell Gáspár , Judit Kovács , Henri Tervo , Antti Kaijalainen , Vahid Javaheri , Johannes Sainio , Jukka Kömi","doi":"10.1016/j.prostr.2025.06.088","DOIUrl":"10.1016/j.prostr.2025.06.088","url":null,"abstract":"<div><div>Offshore steels are developed to have excellent toughness to withstand harsh conditions needed in applications such as offshore oil-drilling platforms, wind power turbines and ships. The heat-affected zones (HAZ) are widely studied but there is less information about the changes in weld metal during multipass welding. In this study the microstructures and impact energy values in the physically simulated HAZ subzones of the weld metal were analysed: coarse-grained (CGHAZ-W) and intercritical (ICHAZ-W) zones. Subzones with 3 different cooling times (t<sub>8/5</sub> = 5, 15 and 30 s) were simulated using Gleeble 3500 simulator. The increase of cooling time slightly reduced the hardness in the subzones. The impact energy values of subzones were below the unaffected weld metal but safely above the required value of the base material standard. Ductile and ductile/brittle behavior were observed. Longer cooling time resulted lower impact energy in ICHAZ-W, however this tendency was not observed in CGHAZ-W.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 500-505"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580418","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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Application of Self-Heating Method to Estimate Fatigue Limit of 42CrMo4+QT Steel under Fretting Fatigue Conditions 微动疲劳条件下自热法估算42CrMo4+QT钢疲劳极限的应用

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.092

Martin Nesládek , Martin Matušů , Tomáš Karas , Jiří Kuželka , Jan Papuga

引用次数: 0

Influence of vanadium on microstructure and mechanical properties of high-alloyed steel 钒对高合金钢组织和力学性能的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.093

Aleksandar Todić , Milan T. Djordjević , Dušan Arsić , Ružica R. Nikolić , Djordje Ivković , Dragan Cvetković

{"title":"Influence of vanadium on microstructure and mechanical properties of high-alloyed steel","authors":"Aleksandar Todić , Milan T. Djordjević , Dušan Arsić , Ružica R. Nikolić , Djordje Ivković , Dragan Cvetković","doi":"10.1016/j.prostr.2025.06.093","DOIUrl":"10.1016/j.prostr.2025.06.093","url":null,"abstract":"<div><div>In addition to new, modern non-metallic materials that successfully replace metallic materials in certain fields, steel materials are still widely used in technical practice. This trend will continue for many years. For this reason, there is a need to develop new types of steel with better properties alongside existing ones. The group of newer steels with relatively high values of hardness and toughness includes Cr-Mo steels with high vanadium content. For the investigations in this study, the steel X180CrMo12-1 was used, with varying vanadium content ranging from 0.5% to 3%. Modern equipment was used for the conducted research, including chemical composition analysis, observation of the shape of metallic grains and carbide networks, friction and wear resistance testing, as well as electrochemical characterization. The aim of the conducted research is to determine the composition of carbides, microstructure, morphology, and to evaluate their impact on material characteristics. Steel samples were experimentally tested using scanning electron microscopy with energy-dispersive spectrometry (SEM-EDS) and X-ray diffraction analysis (XRD).</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 534-539"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580425","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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Load path-dependent fatigue capability of forward rod extruded case hardening steel 16MnCrS5 前向棒挤压淬火钢16MnCrS5的载荷路径疲劳性能

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.058

Lars A. Lingnau , Johannes Heermant , Lukas M. Sauer , Carl H. Brakmann , Frank Walther

{"title":"Load path-dependent fatigue capability of forward rod extruded case hardening steel 16MnCrS5","authors":"Lars A. Lingnau , Johannes Heermant , Lukas M. Sauer , Carl H. Brakmann , Frank Walther","doi":"10.1016/j.prostr.2025.06.058","DOIUrl":"10.1016/j.prostr.2025.06.058","url":null,"abstract":"<div><div>With the increasing importance of climate change and the scarcity of resources, the requirements for energy efficiency, emission reduction and resource conservation are increasing. In this context, forming technologies offer considerable potential for light-weight construction, cost and resource efficiency. Forming-induced ductile damage in the form of voids and their growth is currently neglected in the design of components. Commercially, component design is based primarily on the mechanical material properties and the use of safety factors. Incorporating knowledge of forming-induced ductile damage, especially voids, into the design process allows for improved designs and better utilization of lightweight construction. This study focuses on the assessment of the influence of load paths on the fatigue performance and damage mechanisms. Specifically, under axial-torsional fatigue loading, the materials fatigue performance is influenced by the phase shift, which represents the phase angle between cyclic axial and torsional loading. Among the load paths investigated, axial loading significantly contributes to the damage evolution. A phase shift of 90° between axial and torsional loading resulted in a 37% increase in the initial load level. For a total strain amplitude of 0.0025 and an angular amplitude of 10°, the number of load cycles decreased by about 20% compared to a phase shift of 90°. Therefore, studying the influence of damage-sensitive load paths is critical to assess both damage evolution and the fatigue loading capability of formed components.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 303-309"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580718","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