Procedia Structural Integrity最新文献_第9页

Graphene Oxide Nanoribbons for High Early-Strength Cement Concrete 高早强水泥混凝土用氧化石墨烯纳米带

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.001

Shohana Iffat , Fabio Matta , Joseph Meany , Jay Gaillard , Mohammed Baalousha , Mark Elvington

{"title":"Graphene Oxide Nanoribbons for High Early-Strength Cement Concrete","authors":"Shohana Iffat , Fabio Matta , Joseph Meany , Jay Gaillard , Mohammed Baalousha , Mark Elvington","doi":"10.1016/j.prostr.2025.06.001","DOIUrl":"10.1016/j.prostr.2025.06.001","url":null,"abstract":"<div><div>Longitudinal oxidative unzipping of the outer walls of multiwalled carbon nanotubes (MWCNTs) yields graphene oxide nanoribbons (GONRs), which exhibit greater open surface area and functional edge content than MWCNTs. This paper presents a study of the nano-amendment of Portland cement concrete with GONRs in concentrations between 0.05% (in weight of cement, wt%) and 0.0005 wt%, thus up to two orders of magnitude lower than that reported as lower-bound in the archival literature. The dispersibility in aqueous solution as a function of GONR concentration and oxygen weight content (O%) was assessed through dynamic light scattering (DLS) and zeta potential analysis. The results indicated that less effective suspensions were obtained for 0.05 wt% of GONRs and 22.7 O%. Therefore, GONR water suspensions with 30-40% O% were used to manufacture 50 mm × 100 mm cylindrical concrete specimens. After 7 days of curing, results from uniaxial compression tests using four specimens per configuration (MWCNT concentration and O%) showed that the incorporation of GONRs resulted in an average increase in compressive strength up to 45%. Consistent with the DLS and compression test results, SEM micrographs showed well-dispersed GONRs together with accelerated and preferential formation of calcium silicate hydrates (C-S-H) for all GONR concentrations. The results indicate, for the first time, that the incorporation of very small concentrations (as low as 0.0005 wt%) of well-dispersed GONR amendments can significantly enhance the early-age concrete strength. However, such enhancement became insignificant after 28 days of curing.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"67 ","pages":"Pages 1-7"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572447","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 Comparative Study of the Impact of Nano-TiO2 and Nano-silica on the Durability of Concretes Cured at Different Temperatures 纳米二氧化钛和纳米二氧化硅对不同温度固化混凝土耐久性影响的比较研究

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.009

Dan Huang , Mirian Velay-Lizancos , Jan Olek

{"title":"A Comparative Study of the Impact of Nano-TiO2 and Nano-silica on the Durability of Concretes Cured at Different Temperatures","authors":"Dan Huang , Mirian Velay-Lizancos , Jan Olek","doi":"10.1016/j.prostr.2025.06.009","DOIUrl":"10.1016/j.prostr.2025.06.009","url":null,"abstract":"<div><div>A comparative study was conducted to evaluate the impact of diffident types of nanoparticles, specifically nano-TiO<sub>2</sub> and two types of proprietary nano-silica, on the mechanical and durability properties of concretes cured at varying temperatures. The study involved the assessment of compressive and flexural strengths of concretes with and without the incorporation of nanoparticles. Resistivity measurements were also performed to assess the influence of nanoparticles on pore connectivity. Additionally, the total pore volume of concretes with and without the addition of nanoparticles was also measured and water absorption tests were conducted to explore the impact of nanoparticles on concrete permeability. The study further evaluated the damage incurred by concretes exposed to freeze-thaw cycles and deicers, comparing materials with and without nanoparticles. The findings indicated that all types of nanoparticles enhanced concrete’s mechanical properties and durability. Specifically, they significantly reduced total porosity, pore connectivity, and water permeability, with these improvements being more pronounced effect in concretes cured at low temperatures. In terms of increasing the scaling resistance, the optimal dosage of nano-TiO<sub>2</sub> was determined to be 0.5%. However, both the 0.5% and 1.0% dosages contributed to improved mechanical strength of concrete. Finally, a synergistic effect was observed when both types of nano-silica were combined, leading to improvements in the overall performance of the concrete.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"67 ","pages":"Pages 61-79"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572455","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

Corrosion Sensing Properties of Carbon Black-Based Cementitious Smart Coatings 炭黑基胶凝智能涂料的耐腐蚀性能

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.011

Gabriele Milone , Maria Cruz Alonso , Christos Vlachakis , Jean-Marc Tulliani , Abir Al-Tabbaa

{"title":"Corrosion Sensing Properties of Carbon Black-Based Cementitious Smart Coatings","authors":"Gabriele Milone , Maria Cruz Alonso , Christos Vlachakis , Jean-Marc Tulliani , Abir Al-Tabbaa","doi":"10.1016/j.prostr.2025.06.011","DOIUrl":"10.1016/j.prostr.2025.06.011","url":null,"abstract":"<div><div>This research explores the sensing capabilities of carbon black (CB)-based cementitious coatings for detecting deformations arising from reinforcement corrosion. The investigation focused on a chlorides-contaminated reinforced mortar element subjected to controlled accelerated corrosion. The objective is to utilize smart coatings’ sensing properties to establish a link between electrochemical attacks and the mechanical effects induced by corrosion. Differently from their more frequent application in the literature, this type of study focused on a chemical attack rather than physical. The sensors were employed to quantify the increase in internal stress and strain due to oxide formation and propagation within the matrix.</div><div>The sensors exhibit good sensitivity to corrosion progression identifying attack penetration on the reinforcement and crack formation on the surface. The research was initiated with the implementation of a protocol designed to efficiently accelerate corrosion in reinforced mortar beams, considering varying rebar exposure. Subsequently, a correlation was established between the electromechanical response of the smart coatings and the ongoing corrosion in the substrate, culminating in surface fracture development. Positioned transversally to the beam’s longitudinal direction, all sensors consistently provided accurate crack propagation measurements up to an average width of 116 ± 45 μm. Additionally, the sensors demonstrated the ability to provide crack development measurements also when positioned at varying distances from the directly affected rebar sections. This study expands the use of smart carbon-based coatings, positioning them as multifunctional systems beyond traditional structural applications.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"67 ","pages":"Pages 90-106"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572457","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 cyclic resistance curve approach to estimating fatigue limit in the presence of over- and underloads 在超载和欠载情况下估计疲劳极限的循环阻力曲线方法

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.110

Kimmo Kärkkäinen , Joona Vaara , Miikka Väntänen , Mari Åman , Tero Frondelius

引用次数: 0

Assessment of the Structural Parameters Significance Using the Experiment Design in the Production of Pressure Vessel Heads 用试验设计评价压力容器封头生产中结构参数的意义

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.069

Nedeljko Vukojević , Zlatan Ištvanić , Fuad Hadžikadunić , Mustafa Hadžalić , Amna Bajtarević-Jeleč

{"title":"Assessment of the Structural Parameters Significance Using the Experiment Design in the Production of Pressure Vessel Heads","authors":"Nedeljko Vukojević , Zlatan Ištvanić , Fuad Hadžikadunić , Mustafa Hadžalić , Amna Bajtarević-Jeleč","doi":"10.1016/j.prostr.2025.06.069","DOIUrl":"10.1016/j.prostr.2025.06.069","url":null,"abstract":"<div><div>The production of pressure vessel heads by the incremental sheet forming (ISF) causes local deformation and surface hardening. This phenomenon, special in combination with welding and residual stresses, can cause the appearance of brittle fracture. The focus of the research is the heat-affected zone in the welded joint. Using the experiment design and plan matrix, the experimental determination of the fracture toughness, K<sub>Ic</sub>, as well as the total impact energy KV on the specimens taken from the plastically deformed vessel heads is carried out. A three-factor experiment plan is applied in two blocks, with and without post weld heat treatment (PWHT). Two output parameters, K<sub>JIC</sub> and KV, were analysed. The influence of the combination of analysed input parameters on the parameter KV exists, as indicated by the good agreement of the regression model and experimental data. At the same time, the analysis shown ‘inadequate’ agreement of the regression model and experimental data with the output parameter K<sub>JIC</sub> as objective function.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 379-385"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580491","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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Reference temperature determination of RPV steel using small-sized fracture toughness specimens 用小尺寸断裂韧性试样测定RPV钢的参考温度

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.071

M. Zarazovskii , S. Shukayev , K. Lukianenko

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Investigations on concrete cone failure of a cast-in anchor 某浇筑锚杆混凝土锥破坏研究

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.046

Lucie Malíková , Petr Miarka , Mohammad Sami Al Khazali , Stanislav Seitl

引用次数: 0

Corrosion failure in biological fluids of laser melted surface of AISI 321 stainless steel AISI 321不锈钢激光熔化表面在生物流体中的腐蚀失效

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.028

Tsanka Dikova , Natalina Panova

{"title":"Corrosion failure in biological fluids of laser melted surface of AISI 321 stainless steel","authors":"Tsanka Dikova , Natalina Panova","doi":"10.1016/j.prostr.2025.06.028","DOIUrl":"10.1016/j.prostr.2025.06.028","url":null,"abstract":"<div><div>The aim of the present study is to investigate the failure of laser melted surfaces of AISI 321 steel under corrosion in two types of biological fluids: artificial saliva (AS) with different acidity (pH 5,6 and 6,5) and Ringer’s solution. The surface of prismatic samples was melted by continuous CO<sub>2</sub> laser with different regimes. The melted surfaces were subjected to electrochemical corrosion test in biological fluids. The corrosion failure on the surfaces was investigated by OM, SEM and EDX analysis. It was found that regardless of the type and acidity of the environment, two types of corrosion processes took place on the samples’ surface - pitting and crevice. Corrosion pits of different shape and sizes were observed on the surface of all samples. In both corrosion media, the pits on the untreated steel surface were characterized with irregular shape, smooth walls and sizes between 10-300 µm. While these on the surface of the laser-melted layers had a rounded shape, sizes of 10-400 µm, less depth and rough walls. The corrosion failure in depth of the surface layer of wrought and laser treated steel was identical – selective, mainly by destruction of the corrosion non-resistant δ-ferrite phase. Its microstructure defined the corrosion pits morphology, characterizing with irregular shape and great depth (50-300 µm) in the wrought steel surface and shallow (40-100 µm) equiaxed pits on the laser melted layers. From the point of view of resistance to corrosion failure, laser surface melting of AISI 321 steel improves conditions for enhanced durability of the dental and implant constructions.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 99-105"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580772","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

Development of Ni3Ta-based High Temperature Shape Memory Alloys ni3ta基高温形状记忆合金的研制

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.07.004

Alberto Coda, Jannis Nicolas Lemke, Carlo Alberto Biffi, Jacopo Fiocchi, Ausonio Tuissi

{"title":"Development of Ni3Ta-based High Temperature Shape Memory Alloys","authors":"Alberto Coda, Jannis Nicolas Lemke, Carlo Alberto Biffi, Jacopo Fiocchi, Ausonio Tuissi","doi":"10.1016/j.prostr.2025.07.004","DOIUrl":"10.1016/j.prostr.2025.07.004","url":null,"abstract":"<div><div>The development of shape memory alloys operating at temperatures above 373K is a research topic relevant for designing new actuators/sensors able to exploit exhaustive gases and, in general, to increase the working temperature range of the conventional NiTi alloys. The Ni<sub>3</sub>Ta binary system can be considered a promising intermetallic compound because it offers transformation temperatures above 200°C and appears stable under thermal cycling. Like several HTSMAs, this alloy suffers from a poor plastic deformation workability, caused by its coarse microstructure and intrinsic brittleness. In this work, an alloying approach was evaluated with the goal of refining the microstructure without altering the transformation temperatures. Therefore, the alloy chemistry of Ni<sub>3</sub>Ta was modified by the addition of Cu or Co. Furthermore, the effect of heat treatments to tailor the microstructure was explored. The transformation temperatures of samples were characterized by Differential Scanning Calorimetry, the microstructure by Scanning Electron Microscopy and X-Ray Diffraction, and the mechanical properties by microhardness testing. It was observed that Co does not significantly affect the transformation temperatures, while the addition Cu decreases them slightly. Heat treatments were used to affect hardness and transformation temperatures; however, the alloy functional properties proved to be rather stable.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"69 ","pages":"Pages 26-34"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587887","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

Shape memory-based lattice metamaterial: the octet truss cell 基于形状记忆的晶格超材料：八元桁架单元

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.024

C. Corda , E. Armentani , C. Bertolin , C. Gao

{"title":"Shape memory-based lattice metamaterial: the octet truss cell","authors":"C. Corda , E. Armentani , C. Bertolin , C. Gao","doi":"10.1016/j.prostr.2025.06.024","DOIUrl":"10.1016/j.prostr.2025.06.024","url":null,"abstract":"<div><div>Lattice metamaterial attracted great attention in the last years due to their intelligent behaviour when subjected to external stimuli, which is also denoted as shape memory effect. This is the principle on how the 4D Additive Manufacturing is based on: it is possible to create complex geometry making the material “programmable” building up self-assembly structures. In this preliminary study, the octet lattice metamaterial has been selected to evaluate its performance by taking into account of shape memory effect investigating on its great properties in adaptability in shock absorption, negative Poisson’s ratio, high stiffness and weight efficiency with previous studies conducted in literature; its structure as designed on the commercial software ABAQUS. Through the finite element analysis has been possible to perform the structure under uniaxial compression test studying its response under specific loads changing geometrical configurations -e.g., relative density, diameter of truss- to fully understand the mechanism of the octet lattice metamaterial. The preliminary results show clearly great potential offered by octet truss lattice metamaterial with shape memory effect in terms of shape and stress recovery and in terms of planned structure degradation which could be advantageously exploited in future for many industrial applications.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 66-76"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580017","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