Frattura ed Integrita Strutturale最新文献_第5页

Structural behavior of Lightweight and High strength Layered Hollow Core Slabs 轻质高强层状空心芯板的结构性能

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.13

Asmaa Ghamry, Ahmed Esia, Louay Aboul-Nour

{"title":"Structural behavior of Lightweight and High strength Layered Hollow Core Slabs","authors":"Asmaa Ghamry, Ahmed Esia, Louay Aboul-Nour","doi":"10.3221/igf-esis.63.13","DOIUrl":"https://doi.org/10.3221/igf-esis.63.13","url":null,"abstract":"A new technique of Layered Hollow Core Slab (LHCS) has been used to obtain a slab with an optimum weight-to-strength ratio. Specimens with a 90 mm top layer of High Strength Concrete (HSC) and a 90 mm bottom layer of Lightweight Aggregate Concrete (LWAC) were examined. Nine full-scale slabs with dimensions of 1600* 450* 180 mm were tested under a 4-point loading test. The %core, a/d, RFT ratio, and connection method were the different studied parameters. A push-out test was conducted on triplet specimens to study the bond strength at the interface between HSC jacket and LWAC cubes using bond agent material or shear dowels, or without treatment, to determine which method of them is suitable for connecting the two layers of the tested slabs. Load, deflection, ductility, strain, crack pattern, and mode of failure were studied. The results indicate that ultimate strength is enhanced with decreasing a/d and %core and with an increasing RFT ratio of the LHCS specimens. Using shear dowels ensures an efficient bond between the two layers of the tested slabs. ANSYS program used for modelling the slab. The numerical study accepted the experimental data with a variation of less than 10% for all slabs. ","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42881289","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

High Entropy Cantor Alloys (HEAs) modification induced by tungsten alligation, heat treatment and deep cold plastic deformation 高熵康托合金(HEAs)的钨离子改性、热处理和深冷塑性变形

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.24

A. Brotzu, S. Natali, Zortea Laura, De Filippo Barbara

{"title":"High Entropy Cantor Alloys (HEAs) modification induced by tungsten alligation, heat treatment and deep cold plastic deformation","authors":"A. Brotzu, S. Natali, Zortea Laura, De Filippo Barbara","doi":"10.3221/igf-esis.63.24","DOIUrl":"https://doi.org/10.3221/igf-esis.63.24","url":null,"abstract":"High Entropy Alloys (HEAs) is a unique class of materials that combine particular properties in a large-scale of temperatures, able to guarantee new unexplored materials and alloys with several potentially engineering applications (i.e. space and aerospace industries). As promising structural materials, HEAs consist of five or more principal elements. As a consequence of the monophasic microstructure which usually characterizes HEAs, these alloys offer an excellent combination of strength, strain hardening ability, good plasticity, ductility and fracture toughness especially at cryogenic temperatures better than the existing conventional metals and alloys. For the above reasons, the present work deals with Classic Cantor alloy, a well-known CoCrFeMnNi HEA, where mechanical properties were improved using low cost casting techniques and a combination of different metallurgical methodologies (heat treatment, cold working and adding alloying elements). A promising alloy element, tungsten, was used in the experimentation where mechanical and microstructural characterization were performed using different techniques","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47916772","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

Analysis of the resistance to crack propagation in SENT test specimens printed in ABS using parallel or crossed filaments between layers 采用层间平行或交叉细丝的ABS打印试样的抗裂纹扩展性能分析

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.19

O. Aourik, A. Chouaf, M. Othmani

引用次数: 0

Influence of Quenching Agents on Mechanical, Wear, and Fracture Characteristics of Al2O3 / MoS2 Reinforced Al-6061 Hybrid Metal Matrix Composite (MMCs) 淬火剂对Al2O3/MoS2增强Al-6061复合金属基复合材料力学、磨损和断裂特性的影响

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.12

K. R. Suchendra, M. Sreenivasa reddy, M. Ravikumar

{"title":"Influence of Quenching Agents on Mechanical, Wear, and Fracture Characteristics of Al2O3 / MoS2 Reinforced Al-6061 Hybrid Metal Matrix Composite (MMCs)","authors":"K. R. Suchendra, M. Sreenivasa reddy, M. Ravikumar","doi":"10.3221/igf-esis.63.12","DOIUrl":"https://doi.org/10.3221/igf-esis.63.12","url":null,"abstract":"Aluminium (Al) based composites enhance the mechanical and wear behavior by heat treatment. The quenching factors like cooling agent, cooling rate and temperature of cooling are expected to influence the hardness, tensile, and wear behavior of the Al MMCs. This research shows the outcomes of a sequence of experiments to find the wear and mechanical behavior of the Al6061-Al2O3-MoS2 hybrid composites are quenched with different quenching agents. Hardening of the developed hybrid composites was carried out at 510ºC for the time period of 2 hours. Later, the same composite samples were quenched in ice cubes and water separately. Finally, age-hardening was done at 180ºC temperature for 4 hours and then the samples were cooled under room temperature. Heat treated hybrid composites were subjected to evaluate the hardness, tensile, and wear behavior. The outcomes reveal that the heat treatment significantly enhances the wear and mechanical behavior of hybrid composites. High mechanical strength and improved wear characteristics were observed in the hybrid composites which were quenched using ice cubes. The fractured surface of the tensile test samples and the wornout surface of wear test specimens were studied using a SEM analysis.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47345523","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

On local strength of a spherical vessel with pits distributed along the equator 关于沿赤道分布凹坑的球形容器的局部强度

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.08

D.D. Okulova, L. Almazova, O. Sedova, Y. Pronina

引用次数: 5

Structural behavior of damaged reinforced concrete beams under static cyclic loading 静循环荷载作用下损伤钢筋混凝土梁的结构性能

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.20

A. Elbaz, H. Marzouk, K. Heiza, O. Elnawawy

{"title":"Structural behavior of damaged reinforced concrete beams under static cyclic loading","authors":"A. Elbaz, H. Marzouk, K. Heiza, O. Elnawawy","doi":"10.3221/igf-esis.63.20","DOIUrl":"https://doi.org/10.3221/igf-esis.63.20","url":null,"abstract":"Bridges are regarded as one of the most important components of transportation infrastructure. More and more repairs, inspections, alterations, and construction processes are required to maintain safe usage due to increasing travel demands in addition to bridge infrastructure aging. In this paper, we will discuss the experimental investigation using five reinforced concrete beams to evaluate the effect of making damage to experimental beams under static cyclic loading to investigate their ductility and energy dissipation. The defective parameters taken into consideration in the experimental program were the gap in the concrete mold and mild steel at the middle bottom reinforcement. All tested specimens had the same cross-sectional dimensions. The concrete dimensions of the beams were 200 mm in width and 300 mm in height, and the beam's length was selected to be 2200 mm, having a clear span of 2000 mm between the supports, they were tested in positive bending using a 3-point bending load system. According to the results, when (RC) beams were subjected to any of the mentioned types of damage, they showed a significant decrease in ultimate capacities ranging from 3.03% to 19.31%. The ANSYS model shows an average difference with the experimental program within 4 % as an acceptable agreement.","PeriodicalId":38546,"journal":{"name":"Frattura ed Integrita Strutturale","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46425800","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

Computer Vision Algorithm for the detection of fracture cracks in Oil Hardening Non-Shrinking (OHNS) die steel after machining process 油硬化不收缩模具钢加工后断裂裂纹检测的计算机视觉算法

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.18

Akshansh Mishra, Vijaykumar S Jatti, Nitin K Khedkar, Rahul B. Dhabale, Ashwini V Jatti

引用次数: 0

Numerical Analysis of Reinforced Concrete Circular Columns Strengthening With CFRP under Concentric and Eccentric Loadings 碳纤维布加固钢筋混凝土圆柱在轴心和偏心荷载作用下的数值分析

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.16

Ibrahim S. I. Harba, Abdulkhalik J. Abdulridha, Ahmed A. M. AL-Shaar

引用次数: 2

Investigation on Microstructure and Tensile Fractography of RE Oxides (CeO2/Y2O3) Reinforced AZ91D Magnesium Matrix Composites 稀土氧化物(CeO2/Y2O3)增强AZ91D镁基复合材料显微组织及拉伸断口研究

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.10

Santhosh Gotagunaki, V. S. Mudakappanavar, R. Suresh

引用次数: 0

Artificial neural network based delamination prediction in composite plates using vibration signals 基于人工神经网络的振动信号复合材料板分层预测

Frattura ed Integrita Strutturale Pub Date : 2022-12-21 DOI: 10.3221/igf-esis.63.04

T. Sreekanth, M. Senthilkumar, S. Manikanta Reddy

引用次数: 0