Frattura ed Integrita Strutturale最新文献_第7页

Analysis of the structural integrity of a frozen wall during a mine shaft excavation using temperature monitoring data 利用温度监测数据分析矿井开挖冻壁结构完整性

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.01

L. Levin, M. Semin, I. Golovatyi

引用次数: 0

Description of Fatigue Sensitivity Curves and Transition to Critical States of Polymer Composites by Cumulative Distribution Functions 用累积分布函数描述聚合物复合材料疲劳敏感性曲线及临界状态过渡

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.09

O. Staroverov, A. Mugatarov, A. Yankin, V. Wildemann

引用次数: 3

Compressive behavior of Co-Cr-Mo radially graded porous structures under as-built and heat-treated conditions Co-Cr-Mo径向梯度多孔结构在施工和热处理条件下的压缩行为

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.33

F. Cantaboni, P. Ginestra, M. Tocci, A. Avanzini, E. Ceretti, A. Pola

{"title":"Compressive behavior of Co-Cr-Mo radially graded porous structures under as-built and heat-treated conditions","authors":"F. Cantaboni, P. Ginestra, M. Tocci, A. Avanzini, E. Ceretti, A. Pola","doi":"10.3221/igf-esis.62.33","DOIUrl":"https://doi.org/10.3221/igf-esis.62.33","url":null,"abstract":"Additive manufacturing research is continuously growing, and this field requires a full improvement of the capability and reliability of the processes involved. Of particular interest is the study of complex geometries production, such as lattice structures, which may have a potentially huge field of application, especially for biomedical products. In this work, the powder bed fusion technique was utilized to manufacture lattice structures with defined building angles concerning the build platform. A biocompatible Co-Cr-Mo alloy was used. Three different types of elementary cell geometry were selected: Face Centered Cubic, Diagonal, and Diamond. These cells were applied to the radially oriented lattice structures to evaluate the influence of their orientation in relation to the sample and the build platform. Moreover, heat treatment was carried out to study its influence on microstructural properties and mechanical behavior. Microhardness was measured, and compressive tests were performed to detect load response and to analyse the fracture mechanisms of these structures. The results show that the mechanical properties are highly influenced by the cell orientation in relation to the building direction and that the properties can be further tuned via HT. The favorable combination of mechanical properties and biocompatibility suggests that Co-Cr-Mo lattices may represent an optimal solution to produce customized metal implants.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":"24 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41244464","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

Evaluation on fatigue behaviour of spot-welded joint under low blow impact treatment 点焊接头在低冲击处理下的疲劳性能评价

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.19

M. Padzi, F. A. Ghazali

引用次数: 0

High-quality nodule analysis in spheroidal graphite cast iron using X-ray micro-computed tomography 用x射线显微计算机断层扫描分析球墨铸铁的高质量结核

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.20

Juan Toledo, Felipe Diaz, M. Peralta, D. Fernandino

{"title":"High-quality nodule analysis in spheroidal graphite cast iron using X-ray micro-computed tomography","authors":"Juan Toledo, Felipe Diaz, M. Peralta, D. Fernandino","doi":"10.3221/igf-esis.62.20","DOIUrl":"https://doi.org/10.3221/igf-esis.62.20","url":null,"abstract":"This work is a continuation of the studies presented in a recent paper by the authors, where a methodology to obtain different nodule quality categories in spheroidal graphite cast iron, was proposed. In this study, an exhaustive analysis of the highest-quality graphite nodules was performed. The experimental methodology involves X-ray micro-computed tomography analysis and digital image post-processing of the high-quality graphite nodule population. Furthermore, different subpopulations were selected, following a nodular size criterion. The procedure involves the evaluation and comparison of the sphericity and compactness distributions and the distances between neighbouring nodules by using ad-hoc image processing software. The results reveal the complementary nature of the sphericity and compactness parameters, which allow classifying, with great accuracy, different nodular quality categories of spheroidal graphite cast iron. Additionally, new viewpoints about the nodular morphology study and the distribution of quality nodules in the metallic matrix was provided, which could be extended to other heterogeneous materials.","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":"43769524","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

Elastic and nonlinear crack tip solutions comparison with respect to failure probability 基于失效概率的弹性和非线性裂纹尖端解的比较

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.01

V. Shlyannikov, A. Tumanov, Nataliya Boychenko

引用次数: 0

Predicting Fatigue Crack Growth Behavior of Coalesced Cracks Using the Global-Local Superimposed Technique 用全局局部叠加技术预测聚结裂纹的疲劳裂纹扩展行为

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.11

M. S. Shaari, Sylvia Urai, A. Takahashi, Mohd Akramin Mohd Romlay

{"title":"Predicting Fatigue Crack Growth Behavior of Coalesced Cracks Using the Global-Local Superimposed Technique","authors":"M. S. Shaari, Sylvia Urai, A. Takahashi, Mohd Akramin Mohd Romlay","doi":"10.3221/igf-esis.62.11","DOIUrl":"https://doi.org/10.3221/igf-esis.62.11","url":null,"abstract":"The S-version Finite Element Method (FEM) is known as a global-local superimposed approach that consists of two separate meshes referred to as global and local cracks. The relationship between the energy release rate and the Stress Intensity Factor (SIF) is evaluated to characterize the growth behavior of the fatigue cracks. The SIF is determined using the Virtual Crack Closure Method (VCCM). The cracks propagated in the direction of the loading before coalescing into a single crack. Each crack begins with a length of 10mm and a depth of 3mm. After the crack coalesces, the diameter of the surface crack before it breaks is 28mm, whereas the depth of the crack is 5.3mm. The V-shaped surface crack forms quickly after coalescence occurs and continues to propagate into a massive semi-elliptical surface crack before finally breaking. The result was validated and compared between S-version FEM and the analytical solution. The behavior of the fatigue crack growth shows a good agreement between both methods with small errors. The result indicates that the Root Mean Square Error (RMSE) values before coalescing are 0.1496 with 0.6, and after coalescing is 0.4, the RMSE value is 0.1665. Therefore, it can be stated that the S-version FEM approach can predict the growth of fatigue cracks.","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":"44438239","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

On the use of the stepped isostress method in the prediction of creep behavior of polyamide 6 阶梯等应力法在预测聚酰胺6蠕变行为中的应用

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.24

Lakhdar Sedira, Mohsein Tedjini, B. Guerira, K. Meftah

{"title":"On the use of the stepped isostress method in the prediction of creep behavior of polyamide 6","authors":"Lakhdar Sedira, Mohsein Tedjini, B. Guerira, K. Meftah","doi":"10.3221/igf-esis.62.24","DOIUrl":"https://doi.org/10.3221/igf-esis.62.24","url":null,"abstract":"The stepped isostress method (SSM) is an advanced technique which allows the prediction of the long-term behavior and enables the construction of creep master curves of materials with short-term experimental tests. However, the performance of this method is highly dependent on the numerical model and the time spent in data processing. In this paper, the effect of the extrapolation techniques on the creep curves trend is investigated using the SSM data of Polyamide test. Three extrapolation functions are used to offset the delay of the stress history: polynomial, power and exponential functions. Furthermore, a numerical routine is developed during the last step of the SSM, where the shift factors are computed taking into account the rescaling and the dwell times of each level of stresses. The processing of the SSM raw data has revealed that the rescaling parameters are the most determining factors to reach an accurate long-term creep curves. The rescaling process has shown an appropriate time, whether achieved by the exponential or power functions. Larger shift factors for exponential functions are assessed and therefore a long period of creep master curve was 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":"41972331","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 study of the plasticity effect on the behavior of short steel columns filled with concrete loaded axially 塑性对轴向受压短钢柱性能影响的数值研究

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.07

Yousria Boulmaali-Hacene Chaouche, Nadia Kouider, K. Djeghaba, B. Kebaili

{"title":"Numerical study of the plasticity effect on the behavior of short steel columns filled with concrete loaded axially","authors":"Yousria Boulmaali-Hacene Chaouche, Nadia Kouider, K. Djeghaba, B. Kebaili","doi":"10.3221/igf-esis.62.07","DOIUrl":"https://doi.org/10.3221/igf-esis.62.07","url":null,"abstract":"For more than two decades, the construction technique using concrete filled steel tube (CFST) has been widespread throughout the world. Indeed, it has been demonstrated that the use of normal or high strength concrete, confined in a steel tube of circular shape can considerably improve its ductility as well as its load capacity, owing to the combination of the qualities of the two constituent materials; these tubes have an effortless execution, indeed, the concrete used in the CFST does not require formwork nor reinforcement, a durability of the two materials as well as a good behavior to fire, which was the effect desired at the origin of their elaboration. In this paper, we study the axial compression behavior of short circular steel tubes filled with concrete; their modelling will be performed using the ABAQUS/Standard calculation program. In order to accurately determine their behavior, we have created different models. Indeed, these tubes will be modeled in order to simulate different plastic state behaviours, namely a perfect elasto-plastic state, an elasto-plastic state with multilinear strain hardening and a third elasto-plastic behavior with strain hardening proposed by Tao et al. The tested columns consist of circular hollow sections which are designated in the literature as Concrete Filled Steel Tube (CFST), for which we vary the diameters, heights as well as the wall thicknesses, and which we fill with concrete of different qualities. The compressive behavior, including ultimate loads, confinement, load-deflection relationship and failure modes, was obtained from numerical models and compared with experimental and theoretical results based on Eurocode 4. All these results showed a good agreement and a satisfactory correlation, allowing us to assume that a correct modelling can be sufficient to simulate the behavior of CFST.","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":"42089627","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

Investigation of the Effect of Yarn Waste Fibers and Cocamide Diethanolamide Chemical on the Strength of Hot Mix Asphalt 废纱纤维和乙酰胺二乙醇酰胺对热拌沥青强度影响的研究

Frattura ed Integrita Strutturale Pub Date : 2022-09-22 DOI: 10.3221/igf-esis.62.04

M. Saltan, G. Kaçaroğlu, Öznur Karadağ

{"title":"Investigation of the Effect of Yarn Waste Fibers and Cocamide Diethanolamide Chemical on the Strength of Hot Mix Asphalt","authors":"M. Saltan, G. Kaçaroğlu, Öznur Karadağ","doi":"10.3221/igf-esis.62.04","DOIUrl":"https://doi.org/10.3221/igf-esis.62.04","url":null,"abstract":"In this study, conventional bitumen test were performed on bituminous binder modified with Cocamide Diethanolamide chemical at different ratios. According to results of tests, the most suitable additive ratio has been determined as 5%. However, it was concluded that indirect tensile strength and resistance to moisture of samples prepared with bituminous binder modified with 5% Cocamide Diethanolamide has been adversely affected. It was desired to investigate that whether these properties could be strengthened by yarn waste fibers. Firstly, the effect of 0.1%, 0.2% and 0.3% yarn waste fibers on samples prepared with reference bituminous binder was investigated. Obtained results showed that both indirect tensile strength and resistance to moisture of samples containing 0.1% yarn waste fiber increased. Therefore, 0.1%, 0.2% and 0.3% yarn waste fibers were added to the aggregate mixture and mixing of them with bituminous binder modified with 5% Cocamide Diethanolamide were provided. According to obtained results, different ratios of yarn waste fibers added to aggregate mixture did not have a positive effect on moisture sensitivity. Tensile strength ratio values of samples containing bituminous binder modified with 5% Cocamide Diethanolamide and yarn waste fibers added to the aggregate mixture did not provide specification limit.","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":"47303910","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