Frattura ed Integrita Strutturale最新文献_第8页

Impact of nano sized SiC and Gr on mechanical properties of aerospace grade Al7075 composites 纳米SiC和Gr对航空级Al7075复合材料力学性能的影响

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.30

M. Ravikumar, Rudra Nail

引用次数: 4

Effect of parent concrete strength on recycled concrete performance 母体混凝土强度对再生混凝土性能的影响

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.02

B. Kebaili, M. Benzerara, Souad Menadi, Nadia Kouider, R. Belouettar

{"title":"Effect of parent concrete strength on recycled concrete performance","authors":"B. Kebaili, M. Benzerara, Souad Menadi, Nadia Kouider, R. Belouettar","doi":"10.3221/igf-esis.62.02","DOIUrl":"https://doi.org/10.3221/igf-esis.62.02","url":null,"abstract":"The reuse of concrete waste as a secondary aggregate could be an efficient solution for sustainable development and long-term environmental protection. However, the variable quality of waste concrete, especially with various compressive strengths, can have a negative effect on the final compressive strength of recycled concrete. In this approach, the major goal of this research is to study the effect of parent concrete qualities on the performance of recycled concrete. To accomplish this task, three grades of different compressive strengths (10 to 15) MPa, (20 to 25) MPa, and (30 to 40) MPa have been analyzed in an experimental test program, in which an unknown compressive strength is introduced as well. The experimental mix use 40% of secondary aggregates (both course and fine) and 60% of natural aggregates. This led to the decreasing of the compressive strength of the test concrete between 14% and 23.7% compared to the normal concrete. This loss was improved by adding an amount of cement equivalent to 4% of the weight of the recycled aggregate used. The achieved results prove that the strength properties of the parent concrete have a limited effect on the compressive strength of the recycled concrete. Additionally, low compressive strength parent concrete, when crushed, generates a high amount of fine aggregate and large percentage of recycled coarse aggregates with less attached mortar, and presents the same compressive strength as an excellent parent concrete.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45150337","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: 3

Fabrication, Mechanical and Wear Properties of Aluminum (Al6061)-Silicon Carbide-Graphite Hybrid Metal Matrix Composites 铝（Al6061）-碳化硅-石墨复合金属基复合材料的制备、力学性能和磨损性能

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.10

Shivakumar Gouda, G. Veeresh Kumar, R. Pramod, N. Prasanna, H. Balasubramanya, S. Aradhya

{"title":"Fabrication, Mechanical and Wear Properties of Aluminum (Al6061)-Silicon Carbide-Graphite Hybrid Metal Matrix Composites","authors":"Shivakumar Gouda, G. Veeresh Kumar, R. Pramod, N. Prasanna, H. Balasubramanya, S. Aradhya","doi":"10.3221/igf-esis.62.10","DOIUrl":"https://doi.org/10.3221/igf-esis.62.10","url":null,"abstract":"In recent times, the use of aluminum alloy-based Hybrid Metal Matrix Composites (HMMCs) is being increased in aerospace and automotive applications. HMMCs compensate for the low desirable properties of each filler used. However, the mechanical properties of HMMCs are not well understood. In particular, microstructural investigations and wear optimization studies of HMMCs are not clear. Therefore, further studies are required. The present study is aimed at fabricating and mechanical and wear characterizing and microstructure investigating of Silicon Carbide (SiC) and Graphite (Gr) added in Aluminum (Al) alloy Al6061 HMMCs. The addition of SiC particles was in the range from 0 to 9 weight percentage (wt.%) in steps of 3, along with the addition of 1 wt.% Gr in powder form. The presence of alloying elements in the Al6061 alloy was identified using the Energy Dispersive X-Ray Analysis (EDX). The dispersion of SiC and Gr particles in the alloy was investigated using metallurgical microscope and Scanning Electron Microscopy (SEM). The gain in strength can be attributed to the growth in dislocation density. The nature of fracture was quasi-cleavage. The microstructure examination reveals the uniform dispersion of the reinforcement. Density, hardness, and Ultimate Tensile Strength values observed to be increased with increased contents of SiC reinforcement. Besides, wear studies were performed in dry sliding conditions. Optimization studies were performed to investigate the effect of parameters that affecting the wear. The sliding wear resistance was noticed to be improved concerning higher amounts of reinforcement leading to a decrease in delamination and adhesive wear. The predicted values for the wear rate have also been compared with the experimental results and good correlation is obtained.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47834038","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: 4

Microstructure characterization of sustainable light weight concrete using trapped air additions. 使用截留空气添加剂的可持续轻质混凝土的微观结构表征。

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.14

Said Maaty, A. ElShami, Fryal Kamel

引用次数: 3

Experimentally evaluation of high-performance concrete mixes used for tunnels and containing silica fume and polypropylene fiber after exposed to high temperatures 高温下用于隧道和含硅灰和聚丙烯纤维的高性能混凝土混合料的实验评价

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.28

Mohamed Elmesiri, Mohamed Fawzy Ahmed, M. Bneni, A. ElShami, Seleem S. E. Ahmad

{"title":"Experimentally evaluation of high-performance concrete mixes used for tunnels and containing silica fume and polypropylene fiber after exposed to high temperatures","authors":"Mohamed Elmesiri, Mohamed Fawzy Ahmed, M. Bneni, A. ElShami, Seleem S. E. Ahmad","doi":"10.3221/igf-esis.62.28","DOIUrl":"https://doi.org/10.3221/igf-esis.62.28","url":null,"abstract":"This work introduces an experimental study to evaluate the effect of elevated temperatures on the mechanical properties of high-performance concrete (HPC) mix with changes in Water-Cementitious ratios, W/(C+SF), Silica Fume percent, SF, and Polypropylene, PP, fiber contents. This mix was typically designed to satisfy the requirements of tunnel concrete. The compressive and indirect tensile strengths were measured at room temperature, RT, and after exposure to 400°C and 800°C. Moreover, SEM micrograph and EDS spot analysis tests were done to evaluate the effect of elevated temperatures. Fifteen mixes of HPC with different ratios of W/(C+SF), SF, and PP fiber were tested. According to the test results, the compressive strength values of design mixes increased significantly after exposure to 400°C. Moreover, using SF = 10%, the results indicated remarkable improvements in the compressive strength at 400°C and 800°C, in the case of the W/(C+SF) ratio of 0.31. On the other hand, the highest effect of the presence of PP fibers was 0.211, depending on variable ratios of the W/(C+SF) ratio and the SF content. In the case of PP=0.106 and SF=10%, the mass loss was higher at exposure to temperatures of 800°C.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48896938","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: 1

Multiple linear regression parameters for determining fatigue-based entropy characterisation of magnesium alloy 多元线性回归参数用于确定镁合金基于疲劳的熵表征

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.21

M. Fauthan, S. Abdullah, M. Abdullah, I. F. Mohamed

{"title":"Multiple linear regression parameters for determining fatigue-based entropy characterisation of magnesium alloy","authors":"M. Fauthan, S. Abdullah, M. Abdullah, I. F. Mohamed","doi":"10.3221/igf-esis.62.21","DOIUrl":"https://doi.org/10.3221/igf-esis.62.21","url":null,"abstract":"This paper presents the development of the multiple linear regression approach based on the stress ratio and applied load that was assessed using entropy generation. The energy dissipation is associated with material degradation to determine the fatigue life with consideration to the irreversible thermodynamic framework. This relationship was developed by predicting a complete entropy generation using a statistical approach, where a constant amplitude loading was applied to evaluate the fatigue life. By conducting compact tension tests, different stress ratios were applied to the specimen. During the tests, the temperature change was observed. The lowest entropy generation was 2.536 MJm-3 K-1 when 3,000N load with a stress ratio of 0.7 was applied to the specimen. The assumptions of the models were considered through graphical residual analysis. As a result, the predicted regression model based on the applied load and stress ratio was found to agree with the results of the experiment, with only 9.3% from the actual experiment. Therefore, the entropy generation can be predicted to access the dissipated energy as an irreversible degradation of a metallic material, subjected to cyclic elastic-plastic loading. Thermodynamic entropy is shown to play an important role in the fatigue process to trace the fatigue life.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47450272","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: 1

Experimental and numerical investigation of gap K-joints of rectangular hollow section trusses 矩形空心截面桁架缝隙K型节点的试验与数值研究

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.08

Fayçal Slimani, M. Benzerara, M. Saidani

引用次数: 0

Estimation of the nonlinear dependence of the indications of a fiber Bragg grating on temperature and strain from experimental data 从实验数据估计光纤光栅的指示对温度和应变的非线性依赖关系

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.38

A. Shestakov, I. Shardakov, I. Glot, V. Yepin, G. Gusev, R. Tsvetkov

{"title":"Estimation of the nonlinear dependence of the indications of a fiber Bragg grating on temperature and strain from experimental data","authors":"A. Shestakov, I. Shardakov, I. Glot, V. Yepin, G. Gusev, R. Tsvetkov","doi":"10.3221/igf-esis.62.38","DOIUrl":"https://doi.org/10.3221/igf-esis.62.38","url":null,"abstract":"The readings of the Bragg grating are determined based on the optical radiation reflected from it. A quantitative characteristic of this radiation is the wavelength at which the maximum power of the optical signal is achieved. This characteristic is called the central wavelength of the grating. The central wavelength shift depends on temperature and strain. As a rule, a linear approximation of this dependence is used. However, from the available literature it is known that, the grating wavelength shift demonstrates a strong nonlinear dependence on temperature at 5<T<200K and a weak quadratic dependence close to room temperature. Thus far, the authors have not found studies that consider all terms in the quadratic expansion of the central wavelength of the Bragg grating as a function of temperature and strain at near-room temperatures. Our work is intended to fill this gap. The article describes an experiment in which an optical fiber with Bragg grating was subjected to loading using three different weights. A step-wise temperature change from 5 to 100 0С was realized for each weight. Based on these data, all terms of the quadratic expansion of the desired function are determined. The contribution of each term is estimated.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48631525","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

Influence of manufacturing shrinkage and microstructural features on the strength properties of carbon fibers/PEEK composite material 制造收缩和微观结构特征对碳纤维/PEEK复合材料强度性能的影响

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.36

E. Lomakin, B. Fedulov, A. Fedorenko

引用次数: 0

Mechanical characterization and analysis of tensile fracture modes of ultrasonically stir cast Al6082 composites reinforced with Cu powder premixed Metakaolin particles Cu粉预混偏高岭土增强Al6082超声搅拌复合材料力学特性及拉伸断裂模式分析

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.29

Renjin J Bright, P. Hariharasakthisudhan

{"title":"Mechanical characterization and analysis of tensile fracture modes of ultrasonically stir cast Al6082 composites reinforced with Cu powder premixed Metakaolin particles","authors":"Renjin J Bright, P. Hariharasakthisudhan","doi":"10.3221/igf-esis.62.29","DOIUrl":"https://doi.org/10.3221/igf-esis.62.29","url":null,"abstract":"The major drawback observed in the ceramic particles reinforced aluminium matrix composites (AMCs) is the reduction of ductility. Incorporating fine metallic particles along with the ceramic reinforcements in the aluminium matrix tends to improve the ductility of the AMCs. This work highlights the effects of dispersing micro (5-10 μm) copper (Cu) particles along with the nano (100-400 nm) Metakaolin particles in the Al6082 matrix. The Metakaolin particles were premixed with Cu powder by means of manual stirring followed by ball milling before embedding into the Al6082 matrix. The total reinforcement composition was maintained as 7.5 wt.% in which 2.5 wt.% consisted of Cu powder. The composites were synthesized using ultrasonication-aided stir casting process. The composites samples were subjected to T6 heat treatment before performing mechanical characterization. The composites with Cu powder premixed Metakaolin particles showed improvement in tensile strength, ductility, compressive strength and hardness. The microstructure evaluation of the composites was performed by Scanning Electron Microscope (SEM) and Optical Microscope (OM). The tensile fracture modes were studied by analysing the fracture surface morphology using SEM.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45288163","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