Frattura ed Integrità Strutturale最新文献_第5页

In-Plane Mixed-Mode Brittle Fracture Assessment of Harsin Marble Using HCSP Specimen 使用 HCSP 试样对哈辛大理石进行平面内混合模式脆性断裂评估

Frattura ed Integrità Strutturale Pub Date : 2024-02-15 DOI: 10.3221/igf-esis.68.12

H. Salavati, Zuhair Moqadaszadeh, Morteza Rashidi Mogaddam

引用次数: 0

Retrofitting of Box Section Concrete Beams to Resist Shear and Torsion Using Near-Surface-Mount (NSM) GFRP Stirrups 使用近表面安装 (NSM) GFRP 箍筋改造箱形截面混凝土梁以抵抗剪力和扭力

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.23

Ahmed Mahmoud, Moaz Nasser, Tarek Mostafa, Ahmed Khater

{"title":"Retrofitting of Box Section Concrete Beams to Resist Shear and Torsion Using Near-Surface-Mount (NSM) GFRP Stirrups","authors":"Ahmed Mahmoud, Moaz Nasser, Tarek Mostafa, Ahmed Khater","doi":"10.3221/igf-esis.67.23","DOIUrl":"https://doi.org/10.3221/igf-esis.67.23","url":null,"abstract":"There are a few kinds of research about box section Reinforced Concrete (RC) beams under the effect of combined shear and torsional stresses. In the present research, the concept of adding external strengthening, in the transverse direction, is adopted. The paper focuses on using Glass Fiber Reinforced Polymer GFRP ropes as near-surface mount stirrups. Nine box-section concrete specimens were decanted and tested. Three variables are adopted, (1) GFRP stirrups diameter, (2) GFRP stirrups inclination, and (3) GFRP stirrups spacing. The experimental results showed considerable enhancement in the shear capacity of the strengthened beams by 8 to 56% depending on the effectiveness of the studied parameters. Ductility and toughness were improved when more intensive strengthening schemes were adopted. The shear capacity of all tested beams based on Egyptian code ECP 208–2019 is calculated and compared with that from American code ACI 440–2019 and Canadian code CSA-A23.3-04. The shear capacity from both Egyptian and American codes compared with experimental loads. The analytical results are conservative in some cases and unconservative in others while the analytical results in general are conservative. The Canadian code CSA-A23.3-04 is unconservative compared to the experimental results for the range of the studied parameters and specimens.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"642 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176687","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

Investigations on tool wear behavior in turning AISI 304 stainless steel: An empirical and neural network modeling approach 车削 AISI 304 不锈钢时刀具磨损行为的研究：经验和神经网络建模方法

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.13

S. Chinchanikar, Mahendra Gadge

{"title":"Investigations on tool wear behavior in turning AISI 304 stainless steel: An empirical and neural network modeling approach","authors":"S. Chinchanikar, Mahendra Gadge","doi":"10.3221/igf-esis.67.13","DOIUrl":"https://doi.org/10.3221/igf-esis.67.13","url":null,"abstract":"Machining with a cutting edge with extensive damage or a fractured cutting edge significantly influences the machining performance. Therefore, investigations on tool wear behavior, their forms, and wear mechanisms will be very helpful in the current environment of sustainable manufacturing. On the other hand, the machining economy is negatively impacted by replacing the tool well before its useful life. This proactive maintenance planning reduces the risk of sudden tool failure and potential workpiece damage. Accordingly, the current work creates empirical and ANN models to predict flank wear growth for turning AISI 304 stainless steel using a MTCVD-TiCN/Al2O3 coated carbide tool. The experiments were designed to cover a broad range of operating conditions to ensure the model's accuracy and applicability in practical machining scenarios. An ANN was modeled using a feedforward backpropagation machine learning technique. In this study, a higher prediction accuracy of 0.9975 was achieved with ANN model as compared to the empirical model. The most common wear mechanism observed is metal adhesion, followed by fracture due to the pulling away of adhered material. The developed models have been found to be valuable for optimizing cutting parameters and enhancing tool life in machining.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"381 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176542","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

The effect of beam width and crack-depth ratio on mode I fracture toughness of RCB: an experimental and numerical study 梁宽和裂纹深度比对 RCB I 型断裂韧性的影响：实验和数值研究

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.03

Seleem S. E. Ahmad, Ghada Gamiaa, Abd El-Monem El-Kholy

{"title":"The effect of beam width and crack-depth ratio on mode I fracture toughness of RCB: an experimental and numerical study","authors":"Seleem S. E. Ahmad, Ghada Gamiaa, Abd El-Monem El-Kholy","doi":"10.3221/igf-esis.67.03","DOIUrl":"https://doi.org/10.3221/igf-esis.67.03","url":null,"abstract":"In the present work, the fracture performance of pre-cracked reinforced concrete beams was investigated numerically and experimentally. Experimental and numerical programs were designed to examine the effect of beam width, b, (120 and 250 mm) and crack-to-depth ratio, a/d, (0.1, 0.2 and 0.3) for concrete strength, fc, (40 MPa), on the behavior of stress intensity factor, K1C, and fracture energy, G, for reinforced concrete, RC, beams. The work utilized beams with three-point loading conditions experimentally. Through the use of the ANSYS program, a comprehensive 3-D finite element analysis was conducted with utmost precision to simulate and idealize all experimental specimens. It has been confirmed through numerical and experimental outcomes that the stress intensity factor for RC concrete beams experiences a significant increase as the a/d increases. Furthermore, the fracture toughness values in this study show a slight increase due to the utilization of RC concrete beams with wider width. The validity of the presented concept was demonstrated by comparing the experimentally measured load vs. deflection values to the predicted numerical values and finding them to be acceptable.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"560 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176754","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

The effect of containing Al2O3 microparticles in different matrix polymers on properties of pineapple fiber-reinforced composites 不同基体聚合物中含有 Al2O3 微颗粒对菠萝纤维增强复合材料性能的影响

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.07

Indra Mawardi, Hanif Razak, Zaini Akadir, R. Jaya

{"title":"The effect of containing Al2O3 microparticles in different matrix polymers on properties of pineapple fiber-reinforced composites","authors":"Indra Mawardi, Hanif Razak, Zaini Akadir, R. Jaya","doi":"10.3221/igf-esis.67.07","DOIUrl":"https://doi.org/10.3221/igf-esis.67.07","url":null,"abstract":"In this study, Al2O3 microparticle was used as a filler for pineapple fiber reinforced composites with different matrix polymers. The effect of Al2O3 microparticles in the epoxy and unsaturated polyester matrix on the mechanical, physical, and thermal properties of pineapple fiber reinforced composites was investigated. Pineapple fiber composite was manufactured by hand layup with various Al2O3 contents, 0, 5, 10, and 15 wt%, and a 30 wt% continuous pineapple fiber. The tensile, flexural strength, hardness, water absorption, and thermal stability were investigated according to ASTM. The results showed that flexural strength, hardness, density, and water resistance gradually increased, and the tensile strength rate gradually decreased with more the wt.% of Al2O3 microparticle. The TGA observation results indicated that the Al2O3 microparticles improved the composite's thermal stability. Composites with the epoxy matrix are superior in tensile strength and thermal stability compared to composites made of unsaturated polyester. In contrast, unsaturated polyester matrix composites had higher flexural strength, hardness, density, and water resistance than epoxy matrix composites. The effect of the content of 15 wt% Al2O3 microparticles in the composites resulted in the highest flexural strength, hardness, density, and water absorption resistance, while the tensile strength showed the lowest value.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"43 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176641","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

Crack resistance of carbonized layer of multilayer polyurethane with nanofillers. Combination of casting, solution, carbonization by ion implantation technologies 含有纳米填料的多层聚氨酯碳化层的抗裂性。铸造、溶液和离子注入碳化技术的结合

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.08

R. Izyumov, Alexander Svistkov, Vyacheslav Chudinov, I. Osorgina, Alexander Pelevin

引用次数: 0

Fracture Simulation of Concrete Beams to assess softening behavior by varying different fractions of Aggregates 混凝土梁的断裂模拟，以评估不同骨料成分的软化行为

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.04

H. S. Vishwanatha, S. Muralidhara, B. Raghu Prasad

{"title":"Fracture Simulation of Concrete Beams to assess softening behavior by varying different fractions of Aggregates","authors":"H. S. Vishwanatha, S. Muralidhara, B. Raghu Prasad","doi":"10.3221/igf-esis.67.04","DOIUrl":"https://doi.org/10.3221/igf-esis.67.04","url":null,"abstract":"Simulating the concrete fracture unlike other elastic and brittle materials quite different due to its quasibrittleness. The present research focussed on assess softening behavior by varying different fractions of aggregates and cement matrix in micro details. Extended Finite Element Method (XFEM) for crack modeling implemented for simulating and visualizing crack propagation through Cement matrix, Interfacial Transition Zone (ITZ) and Aggregates . This approach permits the initializing crack by from enrichment zone and propagation of crack through element by traction separation law .The crack formation initiates when the maximum principal tensile stress reaches the tensile strength. The work involves creating python script for iterative process of random distribution of aggregates with in the matrix using Monte Carlo method and creating Cohesive zone element for zero thickness ITZ. introduces a finite element modeling technique for investigating multiscale fracture characteristics. This approach encompasses multiple levels of analysis, including the generation of aggregate particles using a Monte Carlo method implemented via a Python script. Additionally, we replicate the Interfacial Transition Zone (ITZ) between aggregate and mortar in the model. The load-deflection curves can be used to assess the softening behavior of concrete and suggest the realistic fraction of coarse aggregate in mix proportion to impart more ductility to beams.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"744 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176724","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

Computer simulation of stress-strain states in zygomatic bones after complex installation of implants 计算机模拟复杂植入物安装后颧骨的应力-应变状态

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.19

T.M. Dibirov, Aleksey Drobyshev, Edvard A. Kharazyan, N. Redko, Egor Pankov, Alexander A Kozulin, Sergey V. Panin, S. Arutyunov

{"title":"Computer simulation of stress-strain states in zygomatic bones after complex installation of implants","authors":"T.M. Dibirov, Aleksey Drobyshev, Edvard A. Kharazyan, N. Redko, Egor Pankov, Alexander A Kozulin, Sergey V. Panin, S. Arutyunov","doi":"10.3221/igf-esis.67.19","DOIUrl":"https://doi.org/10.3221/igf-esis.67.19","url":null,"abstract":"The research addresses evaluation of stress-strain state (SSS) in the “zygomatic bones–implants–denture base” system by varying the type and number of the zygomatic implants, as well as applying loads. The load magnitude was varied over a wide range, characteristic of the mastication process. Changing the adhesion conditions at the “zygomatic implant–bone tissue” interface varied both the level of maximum stress and the location of the critical stress concentrator. The local violation of the integrity of bone tissue in the skull was one of the key reasons for the redistribution of stresses in the “zigomatic implantdenture base” system. Such a phenomenon should be primarily taken into account when choosing the standard sizes of installed zygomatic implants in order to reduce the compliance of weakened areas of the skull (as the basis of the load-bearing structure). Based on the results of the FEM-based computer simulation, the algorithm was proposed for planning prosthetic treatment, which involves the iterative method for selecting both size and location of installing zygomatic implants depending on the results of the SSS calculation and the onset of a critical condition (primarily in bone tissue at the contact area with zygomatic implants).","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"501 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176835","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

Impact of earthquake’s epicenter distance to failure of the embankment – A seismic prediction 地震震中距对堤坝溃决的影响 - 地震预测

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.09

A. Namdar, Omer Mughieda, Ts Haji Azahar Bin Mohd Yasin, Falak Azhar

引用次数: 0

Fault detection in beam structure using adaptive immune based approach 使用基于自适应免疫的方法检测梁结构故障

Frattura ed Integrità Strutturale Pub Date : 2023-12-17 DOI: 10.3221/igf-esis.67.02

S. Sahu, Shakti Jena

{"title":"Fault detection in beam structure using adaptive immune based approach","authors":"S. Sahu, Shakti Jena","doi":"10.3221/igf-esis.67.02","DOIUrl":"https://doi.org/10.3221/igf-esis.67.02","url":null,"abstract":"Different structural and machine elements are used over the ages. These are subjected to various loads like static and dynamic load, temperature, corrosion etc. Due to the above-mentioned reasons, ageing of the structural elements occur. So, to enhance the designed lifetime of any structure continuous maintenance is required. One such method has been proposed in this research work and the proposed method can be employed as an online tool for the fault identification. Here dynamic analysis of structure has been conducted as the forward method to find out the modal natural frequencies related with the damage. Recently with the application of machine learning approaches and the soft computing, the damage can be detected easily. In this methodology, Clonal Section Algorithm (CSA) has been applied to find out the faults (crack locations and depth) in the structure initially. Later one such method has been developed in the concepts of adaptive immune based technique (Adaptive Clonal Section Algorithm-ACSA) which is the combination of an artificial immune (Clonal Selection Algorithm) and Regression Analysis (RA). The use of regression analysis makes the proposed method more adaptive and the residual error in the collection of vibration data is reduced. The mechanism and various steps involved in CSA, RA and ACSA are analyzed here in a precise manner. The key endeavor of this study is the development of ACSA and its implementation to condition monitoring of structure. To authenticate and check the accuracy of both the methods (CSA and ACSA), laboratory tests are carried out. The results obtained from each method are corroborated with other and found to be convergent.","PeriodicalId":507970,"journal":{"name":"Frattura ed Integrità Strutturale","volume":"33 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139176457","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