Frattura ed Integrità Strutturale最新文献_第6页

Study of defects influence on chlorinated polyvinyl chloride pipes damage and analysis of their fracture 研究缺陷对氯化聚氯乙烯管道损坏的影响及其断裂分析

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.14

F. Gugouch, Meriem Meknassi, M. Elghorba, Achraf Wahid, Houda Mouradi, Bouhsiss Hassan, Aziz Maziri

{"title":"Study of defects influence on chlorinated polyvinyl chloride pipes damage and analysis of their fracture","authors":"F. Gugouch, Meriem Meknassi, M. Elghorba, Achraf Wahid, Houda Mouradi, Bouhsiss Hassan, Aziz Maziri","doi":"10.3221/igf-esis.67.14","DOIUrl":"https://doi.org/10.3221/igf-esis.67.14","url":null,"abstract":"In several industrial applications, plastic, composites and ceramics replace a number of metallic structures such as copper, aluminum and steel. Most recently installed piping water and gas systems in the world are made of thermoplastic due to its advantages, for example, low cost, ease of fabrication and corrosion resistance. In this work, the chosen material is chlorinated polyvinyl chloride (CPVC); the best one used to transport cold and hot water beside simplicity of installation. Notwithstanding, the pipes in service are submitted to different loads, related to environmental, thermal and mechanical effects which procure to mechanisms of degradation. The aim of this article is to assess the effect of the defect on CPVC pipes, through a study of the defect criticality in the form of semi-elliptical, then the ability to predict defected pipes residual life. Therefore unexpected and sudden failure caused by pipes accelerated damage. Therefore, we performed burst tests on both pre-damaged CPVC pipes and virgin ones. To lead our work in this paper, interested in the damage modeling and the failure analysis of CPVC pipes, we adapted the model of unified theory static damage, originally developed in fatigue. We used burst pressure tests to identify the limits of three damage progression phases and, in turn, to calculate the critical life fraction at which these flaws become harmful. Furthermore, we identify the critical depth for the studied defect. These results and techniques enable industrialist s to anticipate this structures service life under these conditions after that set up a robust system of maintenance to ensure a reliable and safe functioning of the structure.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"434 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176511","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

Compressive study on recycled concrete: experiment and numerical homogenization modelling 再生混凝土的抗压研究：实验和均质化数值建模

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.05

Djamel Fellah, S. Barboura, Thileli Tilmatine, K. Benyahi, M. S. Kachi, Jia Li, Y. Bouafia

引用次数: 0

Experimental work of effect of openings on the post-tensioned flat slab 开孔对后张法平板影响的实验工作

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.21

Amal Zamrawi, Ata K. Shoeib, Angelos Abdo, Samir M. Ahmed

引用次数: 0

Effect of Granular Waste Compact Disc on Bond Strength between Steel Bars and Surrounding Concrete 粒状废料压缩盘对钢筋与周围混凝土粘结强度的影响

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.06

B. Mawlood, Sanaa Khaleel, Ahmed Mohammad

{"title":"Effect of Granular Waste Compact Disc on Bond Strength between Steel Bars and Surrounding Concrete","authors":"B. Mawlood, Sanaa Khaleel, Ahmed Mohammad","doi":"10.3221/igf-esis.67.06","DOIUrl":"https://doi.org/10.3221/igf-esis.67.06","url":null,"abstract":"In recent decades, researchers have tried to use waste materials as a partial or complete replacement of the gravel ingredients of concrete to reduce environmental impact. One of these materials is electronic waste. The problem of this disposal material, particularly outdated CDs and DVDs, has turned out to be serious. In this study, 36 pull-out cylindrical shape test specimens were used to conduct an ASTM C234-91A-compliant pull-out test to measure the bonding behavior and strength between three sizes of steel bars and concrete with different embedded lengths, including waste disc shreds (CD and DVD) as a partial substitute for fine aggregate. Four groups of modified concrete specimens with different percentages of disc shreds as partial replacements for sand were prepared. The ratio of cement:sand+disc:coarse aggregate:water was 1:2:2.5:0.4. The disc shreds were utilized to substitute partially for fine aggregate in four different weight percentages: 0%, 4%, 8%, and 12%; nevertheless, the cement-to-sand ratio was consistently 2. Results demonstrated that the bond strength is considerably influenced by the bar diameter and the disc shreds (CDs and DVDs) used as a partial replacement for fine aggregate. The bond strength behavior of the modified concrete with disc fibers is comparable with that of traditional concrete. The ACI-318 Code for the bond strength of ordinary Portland cement concrete was modified to calculate the bond strength of this new kind of disc concrete.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"520 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176677","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

Performance of Reinforced Concrete Flat Slabs Having GFRP Gratings 带有 GFRP 栅格的钢筋混凝土平板的性能

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.18

Ahmed Mahmoud, Haitham Mostafa, Tarek Mostafa, Ahmed Khater

{"title":"Performance of Reinforced Concrete Flat Slabs Having GFRP Gratings","authors":"Ahmed Mahmoud, Haitham Mostafa, Tarek Mostafa, Ahmed Khater","doi":"10.3221/igf-esis.67.18","DOIUrl":"https://doi.org/10.3221/igf-esis.67.18","url":null,"abstract":"A thorough study of the literature indicated that there is not much relevant research on the application of GFRP gratings. Otherwise, extensive study has been done on FRP bars, laminates, sheets, strips, and rods. This study proposes a novel approach to improve the punching shear resistance of flat slab column connections by inserting GFRP gratings across the slab thickness. The results of seven specimens tested under vertical static loading are presented, considering the influence of the grating’s characteristics. All specimens were tested as simply supported slabs under one point of static loading. Experimental results, including crack patterns, slab deflection, concrete compressive strain, tensile steel strain, GFRP grating strain, and failure load, were recorded using extensive electric instrumentation. Test results revealed an enhancement in the failure load ranging between 9.03% and 27.67% for the specimens provided with the GFRP grating. In addition, a nonlinear finite element numerical model analysis was carried out using the ANSYS 15 program. Correlational studies based on the load-deflection response and crack patterns were utilized, resulting in a good agreement between numerical simulations and experimental results with differences ranging from 1.0% to 8.0%.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"762 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176711","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 nonlocal elasticity theory to model the static behaviour of edge-cracked nanobeams 模拟边缘开裂纳米梁静态行为的非局部弹性理论

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.20

D. Scorza, A. Carpinteri, C. Ronchei, A. Zanichelli, Raimondo Luciano, S. Vantadori

引用次数: 0

Damage-failure transition in titanium alloy Ti-6Al-4V under dwell fatigue loads 停留疲劳载荷下钛合金 Ti-6Al-4V 的损伤-失效转变

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.16

V. Oborin, Aleksandr Balakhnin, Oleg Naimark, Yuri Gornostyrev, Vladimir Pushin, Nataliya Kuranova, Dimitrii Rasposienko, Aleksey Svirid, Aleksey Uksusnikov

{"title":"Damage-failure transition in titanium alloy Ti-6Al-4V under dwell fatigue loads","authors":"V. Oborin, Aleksandr Balakhnin, Oleg Naimark, Yuri Gornostyrev, Vladimir Pushin, Nataliya Kuranova, Dimitrii Rasposienko, Aleksey Svirid, Aleksey Uksusnikov","doi":"10.3221/igf-esis.67.16","DOIUrl":"https://doi.org/10.3221/igf-esis.67.16","url":null,"abstract":"The role of structural mechanisms responsible for the consequent staging of damage-failure transition as the combination and continuity of ductile and creep kinetics of the structure evolution and the modeling in dwell fatigue regime. Damage-failure transition is considered as critical phenomena, the structural-scaling transition, when the damage develops as specific phase with characteristic stages: nucleation of new phase and the phase growth kinetics. In the case of dwell fatigue, the nucleation stage is associated with slip localization, faceting, voids and microcrack initiation; the phase growth kinetics has the relation to specific non-linearity of the free energy release responsible for the staging of damage-failure transition. Statistically based phenomenological model of damage-failure transition specified the links of macroscopic material parameters with structural parameters responsible for the influence of microstructure on the structure sensitive mechanical properties. The developed conception of modeling of Ti alloys based on the duality of damage kinetics in dwell fatigue loads allowed us to propose the strategy of structural study to provide in perspective the links of structural parameters of /phases with phenomenological parameters responsible for different mechanisms of damage accumulation at LCF and stress hold regimes.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"563 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176753","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 Pre-tensioning Force on Behavior of Buckling Restrained Brace (BRB) Supported by Double Pre-tensioning System 预张力对双预张力系统支撑的屈曲约束支撑（BRB）行为的影响

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.15

Mohamed Selim, Muhammad E. Kamel, Eman Elshamy, Mohamed R. Emara

{"title":"Effect of Pre-tensioning Force on Behavior of Buckling Restrained Brace (BRB) Supported by Double Pre-tensioning System","authors":"Mohamed Selim, Muhammad E. Kamel, Eman Elshamy, Mohamed R. Emara","doi":"10.3221/igf-esis.67.15","DOIUrl":"https://doi.org/10.3221/igf-esis.67.15","url":null,"abstract":"The study explores the feasibility of a new all-steel buckling restrained brace (BRB) with the double pre-tensioning system as an alternative to conventional concentrically braced frames by using finite element method (ABAQUS program), And to verify modeling, use U-V1 specimen results and compare them with test results. The restraining element in an all-steel BRB is built from a rectangular plate with a double cross arm and cables, making it easy to fabricate, inspect, and replace after a severe earthquake. Numerical analyses were conducted on four groups: first group of specimens using dynamic loading to achieve the minimum thickness for stable hysteretic behavior and high efficiency for BRB, and three groups of specimens using monotonic loading to achieve the best pre-tensioning forces value in steel 37, 44 and 52 for greater efficient use of all steel BRB. The results showed a 66% improvement in bearing capacity, with the external restraining case thickness reduced to 20 mm, making it lightweight, economical, and easy to maintain. The specimens with a pre-tensioning force of 70 kN, 50 kN and 40 kN providing a 31%, 51% and 73.2 % for steel 37, 44 and 52 respectively over than the design specimen without pre-tensioning system.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"92 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176310","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

Material choice to optimise the performance index of isogrid structures 优化等径格栅结构性能指标的材料选择

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.17

C. Bellini, Filippo Berto, V. Di Cocco, Francesco Iacoviello, L. P. Mocanu

{"title":"Material choice to optimise the performance index of isogrid structures","authors":"C. Bellini, Filippo Berto, V. Di Cocco, Francesco Iacoviello, L. P. Mocanu","doi":"10.3221/igf-esis.67.17","DOIUrl":"https://doi.org/10.3221/igf-esis.67.17","url":null,"abstract":"Three key qualities should define the structures used in the aviation industry: they should be light, rigid, and strong. These goals can be met by selecting lightweight, high-performance materials like titanium alloy or composites, but careful structural design is also crucial to improve mechanical performance. The structures known as isogrids, which consist of a skin reinforced by a lattice frame, offer an effective way to meet the aforementioned specifications. The structural performances of isogrid-stiffened cylinders composed of various materials were compared in the current work. The structures under investigation were composed of titanium alloy, carbon fibre composite material, or a combination of both. A FEM model was proposed and validated by comparison with experimental results obtained from a composite material structure, and then it was used to simulate the behaviour of all the other structures. While there was some variation in the strength of the parts, it was discovered that the stiffness was almost uniform throughout all of the structures that were examined. But when the weight of the various constructions was taken into account, some very intriguing findings emerged: the composite material-only structure proved to be the most effective because it had the highest specific performances.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"287 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176502","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

Longitudinal elastic nonlinearity of composite material 复合材料的纵向弹性非线性

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.22

B. Fedulov, D. Bondarchuk, Evgeny Lomakin

引用次数: 0