Frattura ed Integrità Strutturale最新文献_第4页

Interleaving Carbon-Glass Veil in Glass Epoxy Composite for Improved Mode-I Fracture Toughness – A Hybrid Approach 在玻璃环氧树脂复合材料中交织碳-玻璃纱以提高模态 I 断裂韧性--一种混合方法

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.08

Vinayak Uppin, Shivakumar Gouda, I. Sridhar, U. M. A., Aravind Muddebihal, A. Edacherian

{"title":"Interleaving Carbon-Glass Veil in Glass Epoxy Composite for Improved Mode-I Fracture Toughness – A Hybrid Approach","authors":"Vinayak Uppin, Shivakumar Gouda, I. Sridhar, U. M. A., Aravind Muddebihal, A. Edacherian","doi":"10.3221/igf-esis.68.08","DOIUrl":"https://doi.org/10.3221/igf-esis.68.08","url":null,"abstract":"The present study investigates the influence of hybrid interleaving technique using Glass and Carbon veils to improve the mode-I fracture toughness in Glass epoxy laminates. Commercially available non-woven Carbon and Glass veils with different areal densities were used to develop hybrid interleaved composites. Two approaches of interleaving, namely inter-ply and inter-weaved veils, were followed to manufacture the interleaved composite laminates using the hand layup technique. Double Cantilever Beam (DCB) samples were tested to estimate the interlaminar fracture toughness (IFT). Test results indicate that the inter-ply interleaved composite (I-C30G30) exhibited an improved initial and propagation fracture toughness of about 16.98% and 3.08%, respectively. A decreased IFT during initiation and propagation was observed for I-C15G30 and I-C20G30 when compared to plain samples. In case of inter-weaved veil interleaving approach, an improved fracture toughness (GIC and GIP) of about 7.96% and 12.94%, respectively, was observed for W-C15G30 sample, nevertheless W-C20G30 and W-C30G30 showed a drop in fracture toughness (GIC) of an about 12.15% and 9.22%, respectively, and an improvement in fracture toughness (GIP) of about 12.37% and 13.82%, respectively, when compared to plain sample. Scanning electron photo images (SEPI) of cracked laminates witnessed the fracture mechanisms involved in hybrid ply interleaved and non-interleaved composite laminates.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"18 22","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139962838","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 Bacillus Subtilis Bacteria on The Mechanical Properties of Corroded Self-Healing Concrete 枯草芽孢杆菌对腐蚀性自愈合混凝土力学性能的影响

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.09

Kharisma Wira Nindhita, Ahmad Zaki, Abdullah M. Zeyad

{"title":"Effect of Bacillus Subtilis Bacteria on The Mechanical Properties of Corroded Self-Healing Concrete","authors":"Kharisma Wira Nindhita, Ahmad Zaki, Abdullah M. Zeyad","doi":"10.3221/igf-esis.68.09","DOIUrl":"https://doi.org/10.3221/igf-esis.68.09","url":null,"abstract":"Reinforced concrete has a weakness for corrosion which can cause the concrete to crack and the concrete structure to fail. To overcome this problem, a self-healing concrete method is needed that can close cracks and inhibit the rate of natural corrosion. Bacillus subtilis as a self-healing agent in concrete has been proven to be able to increase the compressive strength and flexural strength of concrete. The method used in this research is to add bacterial hydrogel encapsulation to concrete with a variation of 0%; 0.1%; 0.6%; and 1.5% by weight of sand. The test object is a reinforced concrete beams and cylindrical concrete with compressive design strength of 30 MPa. The concrete specimens will go through a series of tests, such as corrosion acceleration tests using DC power supply, self-healing tests by visual observation, flexural strength, ductility, stiffness, and compressive strength tests using Universal Testing Machine (UTM). From the test results, it was found that the addition of 0.1% bacterial encapsulation variation was the optimum value for increasing the mechanical properties of self-healing concrete and reduce the corrosion rate on self-healing concrete.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"1 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963018","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

Evolution of prototyping in automotive engineering: a Comprehensive Study on the reliability of Additive Manufacturing for advanced powertrain components 汽车工程中原型制造的演变：关于先进动力总成部件增材制造可靠性的综合研究

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.07

S. Cecchel, Riccardo Ferraresi, Matteo Magni, Leonardo Guerini, G. Cornacchia

{"title":"Evolution of prototyping in automotive engineering: a Comprehensive Study on the reliability of Additive Manufacturing for advanced powertrain components","authors":"S. Cecchel, Riccardo Ferraresi, Matteo Magni, Leonardo Guerini, G. Cornacchia","doi":"10.3221/igf-esis.68.07","DOIUrl":"https://doi.org/10.3221/igf-esis.68.07","url":null,"abstract":"Additive manufacturing (AM) could be used to reduce the production times of prototypes; however, further research is required to address metals structural parts. To obtain the correct properties, some relevant factors to be considered are the build volume, shape factor, and the need for specific heat treatments. This study aims to evaluate the reliability of AM prototypes applied at a new powertrain system developed to reduce vehicle emissions. Firstly, it was investigated the mechanical behavior, microstructure, and the effect of sample size and heat treatments on both specimens and prototypes made of AM 17-4PH steel. Finite Element Analysis (FEA) was performed to evaluate the structural resistance. Finally, the prototypes were produced, analyzed, and tested on a functional engine test bench to evaluate their reliability. The mechanical properties decreased with an increase in the sample volume. After heat treatment, the yield strength increased, due to the transformation of δ-ferrite in martensite and the reduction of retained austenite. The engine test bench was successfully completed. The conclusions set the basis for similar future applications of time-effective prototypes that can be dimensioned owing to appositely developed postprocesses that guarantee the required resistance.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"27 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139962776","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

An investigation of cracks caused by concrete shrinkage and temperature difference in common reinforced concrete bridge structures. 普通钢筋混凝土桥梁结构中混凝土收缩和温差引起的裂缝调查。

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.16

Van-Hau Nguyen

{"title":"An investigation of cracks caused by concrete shrinkage and temperature difference in common reinforced concrete bridge structures.","authors":"Van-Hau Nguyen","doi":"10.3221/igf-esis.68.16","DOIUrl":"https://doi.org/10.3221/igf-esis.68.16","url":null,"abstract":"Cracking phenomena commonly occur in reinforced concrete structures of bridge and culvert components. While some bridge design standards, such as the AASHTO LRFD standard from America, allow for the presence of cracks, they do not provide direct quantitative limits on permissible crack widths. This research analyzes the crack formation mechanism of reinforced concrete structures under the influence of shrinkage and temperature loading, using the \"tension-chord\" model from the fib MODEL CODE. The research findings demonstrate that despite the steel reinforcement adequately arranged to resist shrinkage and temperature, as per American bridge design standards, cracks frequently occur with widths that may exceed the allowable limits specified in the fib MODEL CODE. The main reason is the inadequate control of concrete construction temperature, especially for large-sized concrete structures. Other findings are: with the same steel ratio, using small diameter reinforcement can significantly reduce the crack width compared to larger ones; Increasing the steel ratio can reduce the crack width but increases the susceptibility to cracking; Crack does not occur immediately after maintenance completion but after a period ranging from several days to several months; Crack width due to concrete shrinkage and temperature changes is typically 0.3mm but may reaches to 0.7mm due to high hydration heat of large sizes structures. ","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"20 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139962977","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 an extra-deep drawing process with industrial parameters: formability analysis and process optimization 利用工业参数对超深拉工艺进行数值研究：成型性分析和工艺优化

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.03

Amina Belguebli, I. Zidane, Adel Hadj Amar, A. Benhamou

{"title":"Numerical investigation of an extra-deep drawing process with industrial parameters: formability analysis and process optimization","authors":"Amina Belguebli, I. Zidane, Adel Hadj Amar, A. Benhamou","doi":"10.3221/igf-esis.68.03","DOIUrl":"https://doi.org/10.3221/igf-esis.68.03","url":null,"abstract":"Extra-deep drawing is one of the most important sheet metal forming processes. The appearance of rupture and wrinkling are the most commonly encountered problems in this process. These defects are also very common at a local company, particularly in the manufacturing of wheelbarrow trays. As a consequence, substantial time and costs are incurred in industrial production. To thoroughly analyze and address these defects, the extra-deep drawing operation of the wheelbarrow tray was modeled by the FE method using Abaqus software. A defect-free manufactured wheelbarrow tray was used to validate the accuracy of the numerical approach. Precise measurements of its dimensions were taken through the reverse engineering process using a 3D scanner. Furthermore, other measurements were made with an ultrasonic thickness gauge to have more precise measurements of the product’s thickness. Comparing experimental and numerical results showed good agreement. The outcomes of the numerical analysis indicate that the final shape of the wheelbarrow tray does not contain rupture or wrinkling defects, accurately corresponding to the real cases manufactured at the company. Numerical modeling and optimization of the extra-deep drawing process performed in this study could potentially reduce production losses and improve the overall efficiency of industrial manufacturing.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"6 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963776","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

Ultrasonic fatigue testing of AISI 304 and 316 stainless steels under environmental and immersion conditions 在环境和浸泡条件下对 AISI 304 和 316 不锈钢进行超声波疲劳测试

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.11

Luis M. Torres Duarte, G. D. Domínguez Almaraz, Hipólito M. Venegas Montaño

{"title":"Ultrasonic fatigue testing of AISI 304 and 316 stainless steels under environmental and immersion conditions","authors":"Luis M. Torres Duarte, G. D. Domínguez Almaraz, Hipólito M. Venegas Montaño","doi":"10.3221/igf-esis.68.11","DOIUrl":"https://doi.org/10.3221/igf-esis.68.11","url":null,"abstract":"Ultrasonic fatigue tests were carried out on stainless steel AISI 316 and 304, under two modalities: at room temperature and in immersion (water for 316 and antifreeze for 304 steels); all tests were carried out with a loading ratio R=-1. The results obtained in the tests at room temperature (without immersion), for both materials exhibited a significant increase in temperature, leaving heat marks on the narrow section of the specimens. This phenomenon occurred due to the low coefficient of thermal conductivity of these stainless steels (16.2 W/ (m °K)), and the recorded temperatures were around 200 °C, generating instantaneous failure of material. Analyzes of fracture surfaces on specimens tested at room temperature reveal that crack initiation was related to the high temperature, causing alteration at the granular scale of the material, followed by a typical behavior crack propagation and failure. For specimens tested under immersion conditions, it was possible to reduce the temperature below 100 °C, which solved the problem of failure due to thermal effect. The results for 316 stainless steel immersed in water showed a fatigue life of 1.188×1010 cycles at188 MPa of stress loading in the specimen; while specimens subjected to 263 MPa stress showed a fatigue life of around 7×106 cycles, representing a significant reduction with an approximate factor of 1700. On the other hand, specimens of 304 stainless steel immersed in antifreeze with the lowest loading values of 169 MPa, showing an infinite ultrasonic fatigue life; while tests subjected to 263 MPa loading stress attains 3.62×106 cycles of ultrasonic fatigue life. The scanning electron microscopy visualizations for both cases of immersion tests showed that the initiation and propagation of the crack occurred on the surface of the specimens, exhibiting the typical mechanical fracture behavior without any apparent thermal influence.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"22 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139962411","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

Application of Machine Learning in Fracture Analysis of Edge Crack Semi-Infinite Elastic Plate 机器学习在边缘裂缝半无限弹性板断裂分析中的应用

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.13

Saeed Hossein Moghtaderi, Alias Jedi, Ahmad Kamal Ariffin, Prakash Thamburaja

{"title":"Application of Machine Learning in Fracture Analysis of Edge Crack Semi-Infinite Elastic Plate","authors":"Saeed Hossein Moghtaderi, Alias Jedi, Ahmad Kamal Ariffin, Prakash Thamburaja","doi":"10.3221/igf-esis.68.13","DOIUrl":"https://doi.org/10.3221/igf-esis.68.13","url":null,"abstract":"This paper discusses the application of machine learning techniques, notably artificial neural networks (ANN), in the fracture analysis of semi-infinite elastic plates with edge cracks. The Stress Intensity Factor (SIF) model for a semi-infinite plate with a tip crack is employed in the study, and Finite Element Analysis (FEA) is performed via ABAQUS CAE to build a comprehensive dataset containing numerical simulations data. To improve accuracy and reliability, data preprocessing is implemented, and ANN as a valuable machine learning model is trained with various variables describing crack propagation, stress distribution, and plate structure as input parameters. The suggested method is compared to established fracture analysis methods, proving its accuracy in predicting crack behavior and stress distribution under a variety of loading circumstances. The model provides useful insights into the behavior of edge cracks in semi-infinite elastic plates, enhancing material engineering and structural mechanics. The study demonstrates the potential of combining FEA and machine learning to improve fracture analysis capabilities, and it discusses limitations and future research directions, encouraging the exploration of advanced machine learning techniques and broader fracture scenarios for future fracture mechanics innovation.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"15 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139962996","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 fiber orientation-based composite lamina on mitigation of stress intensity factor for a repaired plate: a finite element study 基于纤维取向的复合材料薄板对缓解修复板应力强度因子的影响：有限元研究

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.69.14

Abdul Aabid Shaikh, Muneer Baig, M. Hrairi, J. S. Mohamed Ali

引用次数: 0

Exploring strength and ductility responses of beam-column joints using UHPC and UHPFRC employing concrete damaged plasticity 利用混凝土损伤塑性，探索超高性能混凝土结构和超高强度混凝土结构的梁柱连接强度和延性响应

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.05

Guilherme Santos da Silveira, Carlos Natã Zenatti, Gustavo de Miranda Saleme Gidrão, Rúbia Mara Bosse, Paulo Rogério Novak

引用次数: 0

Using the wavelet transform to process data from experimental studies of the discontinuous plastic deformation effect 利用小波变换处理非连续塑性变形效应实验研究数据

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.10

Eugenia Chechulina, Peter Trusov, Roman Gerasimov, Valeriy Vildeman, Michail P. Tretyakov

{"title":"Using the wavelet transform to process data from experimental studies of the discontinuous plastic deformation effect","authors":"Eugenia Chechulina, Peter Trusov, Roman Gerasimov, Valeriy Vildeman, Michail P. Tretyakov","doi":"10.3221/igf-esis.68.10","DOIUrl":"https://doi.org/10.3221/igf-esis.68.10","url":null,"abstract":"Vast number of theoretical and experimental works has been devoted to the study of discontinuous plastic deformation (the Portevin-Le Chatelier effect), which manifests itself for most widely used alloys in certain ranges of both temperatures and strain rates. Due to the statistical nature of this phenomenon, difficulties arise in processing, qualitative analysis and quantitative comparison of test results and calculations. Using of statistical methods for these purposes makes it possible to get only some averaged characteristics of the obtained data (usually - moments of the first and second orders in amplitudes and frequencies). A possible alternative for processing of experimental and theoretical results of this effect research is wavelet analysis using. The results of experimental studies of the Portevin–Le Chatelier effect, realized during the deformation of thin-walled tubular specimens made of aluminum alloy AMg6M at certain strain rates at room temperature are presented. Diagrams of deformation under uniaxial tension, shear, proportional and disproportionate loading of specimens were obtained. The inhomogeneity of strain fields and their rates is shown, illustrating the manifestation of the Portevin – Le Chatelier effect under conditions of complex loading of thin-walled tubular specimens made of AMg6M alloy. A brief overview of existing methods and means of non-destructive testing is presented that make it possible to non-contactly record the spatial heterogeneity of plastic yielding. Some possibilities of using the wavelet transform to process certain types of non-monotonic stress-strain diagrams obtained for the specimens made of the aluminum alloy in question are discussed. Using wavelet analysis, a compact presentation of data from field experiments in the form of amplitude-frequency characteristics was obtained. The scalograms analysis of specimen loading diagrams was carried out.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"29 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139963405","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