Procedia Structural Integrity最新文献_第7页

Probing the Thermo-Mechanical Behaviour of Multi-Track, & Multi-Layer Deposition of Lightweight α+β Ti-Alloy Using Finite Element Modelling Tool 利用有限元建模工具研究轻量化α+β钛合金多径多层沉积的热力学行为

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.08.044

Ravi Prakash , Bikash Kumar , Rajesh K. Khatirkar

{"title":"Probing the Thermo-Mechanical Behaviour of Multi-Track, & Multi-Layer Deposition of Lightweight α+β Ti-Alloy Using Finite Element Modelling Tool","authors":"Ravi Prakash , Bikash Kumar , Rajesh K. Khatirkar","doi":"10.1016/j.prostr.2025.08.044","DOIUrl":"10.1016/j.prostr.2025.08.044","url":null,"abstract":"<div><div>One of the main barriers to the broader application of Laser powder bed fusion (LPBF) technique among additive manufacturing processes is residual stress evolution. Out of the several factors, the sharp temperature gradients caused by a moving localized heat source predominantly plays a role in developing residual stresses. Predicting the residual stresses with precision is essential due to their detrimental impact on the structural and functional features of additively manufactured parts. However, numerical simulations provide a way to save time and material instead of relying on trial-and-error techniques and experimental trials. In order to forecast thermal fields and residual stresses for multi-pass, multi-layer deposition of dual-phase Ti-alloy, a 3D-FE thermo-mechanical model is created. Other parameters are kept constant, and the laser power (500, 2000 W) and laser scan velocity (5, 20 mm/s) are varied. Four build structures with five layers, each having two tracks, are simulated using ABAQUS®2020 commercial software. As the scan speed increases, the residual stress in the build-substrate system increases for a given laser power. This is because a faster scan speed reduces the size of the melt pool, leading to a higher temperature gradient. Consequently, a higher temperature gradient results in greater residual stress. On the other hand, increasing the laser power at a fixed scan speed lowers the residual stress, as a large heat-affected zone (HAZ) is created, which decreases the temperature gradient.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"71 ","pages":"Pages 325-332"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902604","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

Numerical Investigation of Ballistic Performance of Alumina Against Fragment Simulating Projectiles 氧化铝抗破片模拟弹丸弹道性能的数值研究

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.08.022

Nikhil Andraskar , Gaurav Tiwari , Manmohan Dass Goel

引用次数: 0

Hydrogen Embrittlement Susceptibility in High Strength Aerospace Structural Steels 高强度航空结构钢的氢脆敏感性

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.08.040

Johnny Adukwu , Rajwinder Singh , Alan Caceres , Roger Eybel , Mamoun Medraj

{"title":"Hydrogen Embrittlement Susceptibility in High Strength Aerospace Structural Steels","authors":"Johnny Adukwu , Rajwinder Singh , Alan Caceres , Roger Eybel , Mamoun Medraj","doi":"10.1016/j.prostr.2025.08.040","DOIUrl":"10.1016/j.prostr.2025.08.040","url":null,"abstract":"<div><div>Martensitic structural steels are widely used in aerospace components due to the strength-to-weight ratio requirement. However, hydrogen embrittlement (HE) poses a significant threat to the structural integrity of these components. Aerospace components, such as landing gears, can become embrittled by hydrogen ingress during production processes such as electroplating or when operating in corrosive environments. Despite mitigation measures such as post-plating baking, internal hydrogen still persists in the microstructure of the steel substrates, which could lead to catastrophic failures when subjected to high in-service loads. Thus, investigating how hydrogen interacts with the microstructure of high strength structural steels is critical for developing HE resistant steel materials for aerospace applications.</div><div>Quenched and tempered 4340 steel is commonly used in landing gears due to its strength and toughness. 300M, a modified version of 4340, is designed to withstand comparatively high stresses. However, it is imperative to investigate the performance of these steels when subjected to HE conditions. In this study, electrochemical permeation and shear punch techniques are employed to assess their performance at various hydrogen concentrations. Apparent hydrogen diffusivity was significantly higher in 4340 compared to 300M as measured using Devanathan-Stachurski permeation setup under different charging conditions. Consequently, the severity of HE failure was more in 4340 compared to 300M as evaluated by the shear punch testing. The variation in hydrogen-induced failure can be attributed to the differences in formation of second-phase precipitates due to the varying alloy compositions between the subject steels. Insights from this study will advance the improvement of martensitic steels for aerospace structural application.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"71 ","pages":"Pages 295-301"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902703","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

Effect of Proportional/ Non-Proportional Axial-Torsion Cyclic Loading on Fatigue Life of Notched Specimens of C-Mn Steel 比例/非比例轴扭循环加载对C-Mn钢缺口试样疲劳寿命的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.08.015

Shreebanta Kumar Jena , Punit Arora , Suneel K. Gupta , J. Chattopadhyay

引用次数: 0

Effect of Temperature on High Cycle Fatigue Behaviour of Ti-6Al-4V Alloy 温度对Ti-6Al-4V合金高周疲劳性能的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.08.016

T. Vivekananda Swamy , M.M. Thawre , Atul Ramesh Ballal , D. Chandru Fernando , Akshay Mhaiske , Sandeep Kale

{"title":"Effect of Temperature on High Cycle Fatigue Behaviour of Ti-6Al-4V Alloy","authors":"T. Vivekananda Swamy , M.M. Thawre , Atul Ramesh Ballal , D. Chandru Fernando , Akshay Mhaiske , Sandeep Kale","doi":"10.1016/j.prostr.2025.08.016","DOIUrl":"10.1016/j.prostr.2025.08.016","url":null,"abstract":"<div><div>Ti–6Al–4V alloy is widely used in aerospace applications for its high strength-to-weight ratio and outstanding resistance to corrosion. It also ensures better high temperature specific strength. Aerospace components are often confronted with cyclic stresses throughout their operating lives. The fatigue behaviour of Ti-6Al-4V alloy was studied at room temperature (RT) and moderately high temperature (150 ℃) at a stress ratio (R) of 0.7. The specimens were subjected to high cycle fatigue (HCF) loading at 78Hz on the RUMUL TESRONIC resonance system. Fractographic investigations were carried out on the tested specimens. HCF results indicate that, this alloy exhibited a decrease in fatigue strength by 50 MPa upon increasing the temperature from RT to 150 °C. The lower crack initiation resistance behaviour at increased temperatures provides a rationale for the decrease in fatigue strength. Findings from fractographic studies for RT tests reveal that the crack initiation region was observed to originate from the surface. Samples from specimens tested at 150 ℃ reveal that the cracks initiated from the interior.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"71 ","pages":"Pages 111-117"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902708","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

Exploring Heterogeneous Steel Alloys Through Multi-Wire Arc Additive Manufacturing 利用多丝电弧增材制造技术探索异质钢合金

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.08.059

Ganesan G , Siddartha , Shahu Rajaram Karade , Sudhanshu Dubey , Neel Kamal Gupta , K. Narasimhan , K.P. Karunakakran

{"title":"Exploring Heterogeneous Steel Alloys Through Multi-Wire Arc Additive Manufacturing","authors":"Ganesan G , Siddartha , Shahu Rajaram Karade , Sudhanshu Dubey , Neel Kamal Gupta , K. Narasimhan , K.P. Karunakakran","doi":"10.1016/j.prostr.2025.08.059","DOIUrl":"10.1016/j.prostr.2025.08.059","url":null,"abstract":"<div><div>This study explores the innovative fabrication of heterogeneous steel alloys using an in-house developed multi-wire arc additive manufacturing (M-WAAM) setup based on gas tungsten arc welding (GTAW). This study creates alloy compositions with specialized mechanical properties by combining the unique properties of mild steel (ER70S-6) and stainless steel 304 grade (SS-304). This multi-wire setup makes it possible to deposit both materials simultaneously, introducing a novel uniformity and versatility to the alloy fabrication process. The compatibility of ER70S-6 and SS-304 during the deposition process is examined. It focuses on changing the wire feed rate (WFR) of these filler wires to alter their phase composition, and it also looks at how these phase changes affect the mechanical properties of the heterogeneous steel alloy. The results demonstrate that a higher proportion of the austenite phase significantly enhances ultimate tensile strength and hardness. This improvement in mechanical properties was achieved by effectively combining the unique attributes of ER70S-6 and SS-304, resulting in a heterogeneous steel alloy.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"71 ","pages":"Pages 438-444"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902781","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

Defect Evolution and Mechanical Degradation of Alloy 690 in Molten Glass Environment 690合金在熔融玻璃环境中的缺陷演化与力学退化

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.08.018

P.K. Sharma , M.K. Samal , A. Syed , D. Gupta , J. Chattopadhyay

{"title":"Defect Evolution and Mechanical Degradation of Alloy 690 in Molten Glass Environment","authors":"P.K. Sharma , M.K. Samal , A. Syed , D. Gupta , J. Chattopadhyay","doi":"10.1016/j.prostr.2025.08.018","DOIUrl":"10.1016/j.prostr.2025.08.018","url":null,"abstract":"<div><div>Alloy 690 is widely used in nuclear vitrification melters for its high-temperature strength and creep resistance. Operating temperatures of components can reach up to 1100 °C under corrosive molten glass environment. Thermal gradients and structural loads generate high interfacial stresses leading to localized corrosion and potential degradation of vessel life. In this work, the evolution of defect size, density and their distribution due to exposure of molten glass environment on Alloy 690 material have been studied. Tensile specimen has been designed and fabricated using 10 mm thick Alloy 690 plate that is used in fabrication of nuclear reprocessing plant components. These tensile specimens have been exposed to molten glass environment for different time durations, temperature and stress levels. The changes in mechanical properties under different operating conditions have been determined. It has been observed that there is significant reduction in ductility and strength of material after exposure to molten glass environment. Reason for such a change in mechanical properties have been investigated using the defect evolution in the Alloy 690 specimen. Microstructure analysis of tensile specimen has been carried out using optical microscopy to find the depth of defect developed on the surface after exposure to molten glass environment. Descriptive statistics has been used to summarize the key characteristics i.e., mean size, maximum size of defects and their standard deviations. These data shall be useful for life estimation of nuclear reprocessing components.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"71 ","pages":"Pages 126-133"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144902710","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

Mechanical and Microstructural Behavior of Foamed Concrete with Polypropylene Fibers and Mineral Admixtures 聚丙烯纤维和矿物掺合料泡沫混凝土的力学和微观结构性能

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.07.047

C. Raghu Rami Reddy , H. Sudarsana Rao , Vaishali. G. Ghorpade

{"title":"Mechanical and Microstructural Behavior of Foamed Concrete with Polypropylene Fibers and Mineral Admixtures","authors":"C. Raghu Rami Reddy , H. Sudarsana Rao , Vaishali. G. Ghorpade","doi":"10.1016/j.prostr.2025.07.047","DOIUrl":"10.1016/j.prostr.2025.07.047","url":null,"abstract":"<div><div>This study investigates the mechanical strength and microstructural properties of foamed concrete, which is made to a density of 1200 kg/m³ and enhanced with 10% mineral admixtures (fly ash, metakaolin, or silica fume) in place of cement and 0.8% polypropylene (PP) fibers by volume. To improve matrix cohesiveness, three improved mixes were compared to a baseline mix of cement, water, foam, superplasticizer, and natural sand. Compressive, flexural, and split tensile strengths were evaluated at 7, 14, 28, 56, and 90 days. Refined pore architecture and uniform fiber dispersion in changed mixtures were revealed by scanning electron microscopy (SEM).The silica fume mix showed the greatest strength gains and microstructural improvements, thanks to its fine particles and strong pozzolanic activity. Combining PP fibers with mineral admixtures improves durability, strength, and crack resistance, making foamed concrete more suitable for structural applications. These advancements offer lightweight, sustainable construction options while minimizing structural dead loads. Ongoing study is recommended to investigate long-term durability and alternate fiber types to improve performance.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"70 ","pages":"Pages 223-230"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878195","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

Effect of cable stiffness on the responses of a cable stayed bridge 索刚度对斜拉桥响应的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.07.095

Jaiyash Jaiswal , P.K. Mehta , Goutam Ghosh

{"title":"Effect of cable stiffness on the responses of a cable stayed bridge","authors":"Jaiyash Jaiswal , P.K. Mehta , Goutam Ghosh","doi":"10.1016/j.prostr.2025.07.095","DOIUrl":"10.1016/j.prostr.2025.07.095","url":null,"abstract":"<div><div>Bridges are crucial in providing efficient transportation, infrastructure, and their design significantly influences structural performance, durability and over all safety. This study focuses on the comparative analysis of cable stay-bridge with different cable stiffness. The aim is to evaluate and distinguish their structural characteristics to improve bridge design and construction. Finite element analysis and simulation tools (MIDAS CIVIL) are employed to perform the Parametric analysis of cable stiffness of cable-stayed Bridge under different IRC loading conditions providing insights into their performance metrics such as bending moments, cable forces, deflection and Tower base moment. Cable stiffness is considered in two ways: the first is cable area and the second one is modulus of Elasticity of the cable. Economic contributions are crucial in infrastructure projects and this study evaluates the most economic section of cable stiffness. A three span fan type cable stayed-bridge of length 420m is considered. The Cable area is reduced by 5 to 20 percent, and also Modulus of Elasticity of cable are altered as per cable type.</div><div>The finding indicates that increase in cable area has more impact than increase in cable’s modulus of Elasticity. This study contributes towards Structural and working field engineers.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"70 ","pages":"Pages 596-603"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878336","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

Statistical interpretation of strength data for High-volume fly ash concrete – a new mix proportioning technique 大体积粉煤灰混凝土强度数据的统计解释——一种新的配合比技术

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.07.105

Saurav Kar , Saptarshi Das , Akash Pradhan , Anup Kumar Mandal , Sujoy Biswas

{"title":"Statistical interpretation of strength data for High-volume fly ash concrete – a new mix proportioning technique","authors":"Saurav Kar , Saptarshi Das , Akash Pradhan , Anup Kumar Mandal , Sujoy Biswas","doi":"10.1016/j.prostr.2025.07.105","DOIUrl":"10.1016/j.prostr.2025.07.105","url":null,"abstract":"<div><div>Posing its importance in building infrastructure, compressive strength is regarded as one of the most critical parameters to choose the grade of concrete. High performance concrete production not only involves huge physical effort and quality control, but also involves the incorporation of supplementary cementitious material in conjunction with high quality additives. In this present study, high volume fly ash content is used for high performance concrete mix. For any mix proportioning technique adopted, regression analysis is of utmost importance to validate the model. This current work covers detailed literature study on various forms of regression models developed for fly ash based concrete mixes. A new mix proportioning technique is adopted with cement replacement with class F fly ash as well partial addition of sand with fly ash as fine aggregate. In this present study, a linear regression analysis is conducted which produced excellent correlation coefficient for prediction of compressive strength at 28-days curing for high-volume fly ash concrete mixes. For the pulverized fuel ash substitution from 40%, 50%, 60% and 70% (cem:F<sub>ash</sub> 1:1), improved workability properties were obtained with increased chemical admixture content (~1-2%). Good correlation coefficient (R<sup>2</sup>) values of 0.9831 or 98.3% are obtained at higher w/b ratios for 28-days curing. Trendline indicates the linear relationship with R<sup>2</sup> value of 0.9831 for higher w/b ratios and 0.974 for lower w/b ratios, suggesting a strong negative correlation. This signifies, a better model fit. Higher R<sup>2</sup> values of 0.98 signifies, good model fit, while R<sup>2</sup> values of 0.843 shows 15.7% variance due other properties in concrete such as reduced pozzolanic activity and fly ash reactivity at higher fly ash content beyond 40% and low water-binder ratios. Lower standard deviation values show that the data set is closely tight.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"70 ","pages":"Pages 674-681"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144878372","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