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Developing local rubber mixture for seismic base isolation system type high damping rubber bearing

materials Today: Proceedings 2023年 74卷 881-888页

作者： Ghrewati, Bahaa Eddin Tarsha Kurdi, Kheir Eddine Jena, Trilochan Siksha ‘O’ Anusandhan University Odisha Bhubaneswar India Dept. of Engineering Materials Science Faculty of Mechanical Engineering Aleppo University Syria

The research objective is to develop a rubber mixture for the High Damping Rubber Bearing HDRB type of seismic base isolation system to resist seismic loads, and compare it with international companies’ brochures. Experiments were conducted on three HDRB models of 150 mm in diameter and 12 cm in height. These models were manufactured locally from natural rubber with other chemical additives and steel sheets. Load and unload tests (quasi-static) were conducted on the models simulating earthquake loads, first loaded with a vertical load of 110 kN, and then the base cyclic horizontally with an increasing amplitude of 25 % until 125 % of the shear strain. The vertical stiffness was 44,027 kN/m, the effective horizontal stiffness was 334 kN/m, and the damping ratio was 20.1 % experimentally. The results were within satisfactory ranges of the parametric values in the manufacturing design brochure, indicating the developed rubber mixture is convenient, giving a great motivation to manufacture seismic isolators locally at suitable prices. © 2022

关键词： Rubber

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The Effect of SiO2 Additives on Sintering Ca-α-SiAlON Powder Prepared by Combustion Synthesis

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2024年第9期71卷 423-426页

作者： Iizuka, Takamasa Yokouchi, Masahiro Dept. Mechanical and Materials Engineering Kanagawa Institute of Industrial Science and Technology 705-1 Shimoimaizumi Ebina243-0435 Japan

Composite of Ca-α-SiAlON and β-SiAlON was obtained by hot pressing of mixture of commercially available Ca-α-SiAlON and SiO2 powders under 40 MPa at 1800°C for 2hours. The Ca-α-SiAlON powder used in this study was manufactured with combustion synthesis technique. Effect of SiO2 additive on the mechanical properties of the SiAlON composite was investigated by changing the amount of the additives;1, 3, 5 and 7 wt%. The highest strength, 736 MPa for the 4 points bending strength, was obtained in the SiAlON composite sintered with the addition of 5 wt% SiO2 powder. From the results of XRD, SEM, and EPMA analysis, we found the formation of columnar β-SiAlON grains facilitated by the addition of SiO2 powder led to the high strength. © 2024 Japan Society of Powder and Powder Metallurgy.

关键词： Combustion synthesis

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Formal Verification of a Nuclear Plant Thermal Dispatch Operation Using System Decomposition 6

Formal Verification of a Nuclear Plant Thermal Dispatch Oper...

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6th IEEE International Conference on Trust, Privacy and Security in Intelligent Systems, and Applications, TPS-ISA 2024

作者： Kapuria, Abhimanyu Cole, Daniel G. University of Pittsburgh Dept. of Mechanical Engineering and Materials Science Pittsburgh United States

ISBN: (纸本)9798350386745

This paper discusses methods to prove the safety of critical cyber-physical systems. Critical infrastructure, such as nuclear power plants, are prone to vulnerabilities due to the integration of industrial internet-of-things technologies. Automation and computation introduces greater complexity into these systems. Thus, traditional safety analysis methods, including probabilistic risk assessment and system theoretic process analysis, can be limited in their scope of analysis, specifically in addressing software vulnerabilities and the cyber-physical interface. To address these limitations, we propose an approach to safety analysis by integrating multiple formal verification methods within the context of hybrid systems. This approach employs a combination of reachability analysis and theorem proving, specifically using differential dynamic logic (dL), to model and verify the safety of a nuclear plant's thermal dispatch operation. By decomposing the system into individual components, our method reduces computational complexity and enhances the verification process, ensuring the resiliency of critical infrastructure against potential hazards. This integrated approach offers a comprehensive framework for the safety and security of complex, cyber-physical systems. © 2024 IEEE.

关键词： Nuclear power plants

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Every Click You Make, Every Break You Take, We'll be Watching You 54

Every Click You Make, Every Break You Take, We'll be Watchin...

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54th IEEE Frontiers in Education Conference, FIE 2024

作者： Pabst, David M. Zwastetzky, Lucas J. Borysiak, Kristian A. Dosse, Lee A. Barry, Matthew M. University of Pittsburgh Dept. of Mechanical Engineering and Materials Science PittsburghPA United States

ISBN: (纸本)9798350351507

This research-based full paper investigates Pre-recorded Lecture Video (PLV) viewership habits and elucidates correlations between practice and course performance. Using PLVs and Flipped Class Formats (FCFs) is increasingly prevalent in colleges and universities, driven by various motivating factors. Delivering content that was traditionally done didactically in a format that is both accessible and engaging has many benefits to not only the students but also instructors. For example, students can review PLVs multiple times at their convenience until they understand the material. From an instructional standpoint, PLVs and FCFs allow for more classroom interaction, whether through instructor-led examples or peer-to-peer learning activities. As with any new instructional technique, there are best practices that maximize both student performance and satisfaction, often guided by research. Previous studies have investigated both student use and interaction mechanisms of PLVs, specifically their level of viewership and completion of conceptual check-point questions that could be answered while or after watching assigned videos. Students who had substantial viewership and interacted with the PLVs by answering questions witnessed a statistically significant increase in their course grades compared to those who did not. However, viewership and interaction with a PLV do not tell the whole story. To this end, it is crucial to understand how students use PLVs, specifically, what habits they form while watching PLVs and how this behavior affects their performance in the course. During two years, 445 students enrolled in a sophomore-level Statics and Mechanics of materials course were instructed using PLVs and an FCF. The students were required to view PLVs before class (on the University's approved Learning Management System, Canvas, using Panopto) and answer basic conceptual questions on Top Hat. Student viewership data (date and time watched, minutes delivered, etc.) was colle

关键词： Students

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Microstructure and Strengthening Mechanism of Powder Metallurgy Extruded Titanium Alloys with Carbon Solid Solution

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Funtai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy 2024年第10期71卷 474-481页

作者： Kariya, Shota Ichikawa, Eri Teramae, Takuma Li, Shufeng Li, Xiaochun Kondoh, Katsuyoshi Umeda, Junko Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki 567-0047 Japan Dept. Mechanical Engineering Graduate School of Engineering Osaka University 2-1 Yamadaoka Suita565-0871 Japan School of Materials Science and Engineering Xi'an University of Technology Xi'an710048 China Dept. of Materials Science and Engineering University of California Los AngelesCA90095 United States

The effect of carbon elements on the microstructures and mechanical properties of pure Ti alloys fabricated through extruded powder metallurgy route was investigated. Furthermore, the strengthening mechanism of extruded materials was also investigated quantitatively. In Ti-C materials, the lattice parameter in c-axis of α-Ti increased due to solid solution of carbon atoms in the most stable octahedral interstitial sites. As the carbon contents increased, tensile strength was increased while maintaining a high elongation at break. The 0.2% yield stress of Ti-2.0 mass% TiC increased by 242 MPa compared with pure Ti. The elongation at break value exceeded 35.0% for all specimens. According to this analysis, it was clarified that Fm value of Ti-C materials was 2.90 × 10-10 by using Labusch model. The estimated strengthening improvement using these values was significantly agreed with the experimental results of PM Ti alloys with carbon solution atoms. Furthermore, the strengthening mechanism of the alloys was quantitatively clarified that carbon solution strengthening was the dominant factor in this study. © 2024 Journal of the Japan Society of Powder and Powder Metallurgy. All rights reserved.

关键词： Titanium alloys

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CFD Analysis of Separated Flow over the Gaussian Bump using Various Turbulence Models

CFD Analysis of Separated Flow over the Gaussian Bump using ...

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AIAA science and Technology Forum and Exposition, AIAA SciTech Forum 2025

作者： Qian, Xuehui Agarwal, Ramesh K. Dept. of Mechanical Engineering & Materials Science Washington University St. LouisMO63130 United States

ISBN: (数字)9781624107238

ISBN: (纸本)9781624107238

Smooth body separation remains a challenging problem in understanding the aerodynamic behavior of various aerospace vehicles, significantly impacting their operational performance. The focus of this paper is on the numerical simulation of the flow field of a Gaussian bump (also known as the Boeing bump), which represents a model benchmark three-dimensional geometry involving the smooth body separation. The available experimental data with detailed pressure variations along the streamwise centerline and ridge of the bump provides a robust basis for testing the accuracy of various turbulence models in conjunction with the Reynolds-Averaged Navier-Stokes (RANS) equations in predicting the separation and reattachment behind the bump in the downstream region. There have been previous computational efforts employing the Spalart-Allmaras (SA) model;however, the discrepancies between the computations and experimental data remain. This paper investigates the application of the one-equation Wray-Agarwal (WA) turbulence model and compares its performance with the SA model predicting the separated flow over the bump. The results include the pressure coefficients along the centerline and the ridge, providing a comprehensive evaluation of the performance of the WA model. All the results were obtained employing Ansys Fluent with the implementation of the WA model through a user-defined function (UDF). © 2025, American Institute of Aeronautics and Astronautics Inc, AIAA. All rights reserved.

关键词： Navier Stokes equations

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Investigation of the Effects of Oyster Shell Powder Bio-Fillers on the mechanical Properties of Reinforced Epoxy Composites

Investigation of the Effects of Oyster Shell Powder Bio-Fill...

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2024 International Conference on science, engineering and Business for Driving Sustainable Development Goals, SEB4SDG 2024

作者： Agbeboh, Newton I. Adus, Abon Adediran, Adeolu A. Oladele, Isiaka O. Ogundipe, Oluwasogo L. Federal University Dept. of Mechanical and Mechatronics Engineering Bayelsa State Otuoke Nigeria Landmark University Dept. of Mechanical Engineering Kwara State Omu-Aran Nigeria University of Johannesburg Dept. of Mechanical Science South Africa Federal University of Technology Dept. of Metallurgical and Materials Engineering Ondo State Akure Nigeria

ISBN: (纸本)9798350358155

Oyster shells are majorly composed of large amounts of calcium with layers of viscoelastic proteins. However, due to their biodegradability, Oyster shells are regarded as waste materials. The shells can be combined with lightweight polymer matrices, like the widely used epoxy thermosetting polymer. This research seeks to utilize oyster shells as bio-fillers for reinforced epoxy composite manufacture. Oyster shell powder was, used as a reinforcement for an epoxy polymer matrix to create a new composite with superior mechanical properties. Oyster shell powders were used as natural fillers composites were developed using different ratios of the Epoxy resin (10%, 20%, and 30%) of oyster shell powder, employing the hand layup method. This was done to improve the hardness, tensile, and impact resistance properties of the epoxy composite. As a direct result of using the oyster shell powders as reinforcement materials infused within the epoxy polymer matrix. The results were critically analyzed and it was discovered that the addition of oyster shell powders led to the enhancement of the impact resistance of the developed composites, while the hardness and tensile strengths of the composites were slightly reduced compared to the control. The developed composites could be utilized as plastic-based ceiling boards for the construction industry. © 2024 IEEE.

关键词： Tensile strength

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Effect of Sintering Temperature on Adhesion Strength of Hydroxyapatite Coating Layer of Titanium TNTZ Prepared by Dip Coating Method 4

Effect of Sintering Temperature on Adhesion Strength of Hydr...

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4th International Symposium on Advances and Innovation in mechanical engineering, ISAIME 2023

作者： Gunawarman Affi, Jon Zaky, Fakhar Chandra, Devi Niinomi, Mitsuo Akahori, Toshikazu Dept. of Mechanical Engineering Universitas Andalas Padang25163 Indonesia Institute for Materials Research Tohoku University Sendai Japan Division of Materials and Manufacturing Science Graduate School of Engineering Osaka University Japan Dept. of Material Science and Engineering Graduate School of Science and Technology Meijo University Nagoya Japan

This study investigates the effect of sintering temperatures on the adhesion strength of hydroxyapatite (HA)-coated Ti–29Nb–13Ta-4.6Zr (TNTZ) prepared using the dip coating method. TNTZ samples were coin-type specimens with a diameter of 15 mm and a thickness of 4 mm, and polished surfaces. The sol-gel, which is used to help the hydroxyapatite adhere to the metal surface of the material, was prepared by mixing KH2PO4 liquid, Ca(NO3)2 liquid, and NH4OH as a catalyst. The coating process uses the dip coating method with an immersion time of 30 seconds and a withdrawal speed of 4 mm/s. The sintering process was carried out at a temperature of 700 ?, 800 ?, and 900 ? for 1 hour, respectively. The surface morphologies were then examined using optical and scanning electron microscopes. Coating layer thickness, covered surface, and addition strength were then measured by using related equipment. The results show that the measured surface properties depend significantly on the sintering temperatures. The additional strength decreases with increasing temperature although layer thickness increases. The higher sintering temperatures seem to lead to more cracks and detachment of the hydroxyapatite layer, reducing the covered surface area and adhesion strength. The low sintering temperature of 700? achieves better coating characteristics and adhesion strength of titanium TNTZ. © 2025 Institute of Physics Publishing. All rights reserved.

关键词： Sintering

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Ultra-Low Thermal Conductivity of Laterally Arranged Nanowire Arrays Through Constriction engineering 9

Ultra-Low Thermal Conductivity of Laterally Arranged Nanowir...

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9th International Multidisciplinary Moratuwa engineering Research Conference, MERCon 2023

作者： Henadeera, Pasan Somarathna, Chamara Satheekshana, Wenusara Withanage, Yohan Samaraweera, Nalaka University of Moratuwa Dept. Mechanical Engineering Moratuwa Sri Lanka University of Moratuwa Dept. Materials Science and Engineering Moratuwa Sri Lanka

ISBN: (纸本)9798350345216

Nanostructured semiconductor materials exhibit remarkable thermal insulating properties compared to their bulk counterparts, making them highly promising for Thermo-Electric (TE) applications. This study employs computational tools to investigate the superior thermal insulating properties of Nanowire Chain (NWC) structures achieved through constriction engineering of laterally aligned nanowire arrays. Various surface and constriction modifications of NWCs are investigated to understand their impact on the thermal conductivity. The results demonstrate that the NWC structure achieves a substantial oneorder reduction in thermal conductivity compared to nanowires and nanosheets of similar dimensions. Moreover, this study evaluates the effectiveness of commonly used phonon suppression techniques, such as superlattice structures, shell alloying, and surface atom removal, in NWC configurations. The comprehensive analysis provides valuable insights into the phonon transport characteristics within different classes of NWCs, shedding light on their potential for diverse applications in the field of TE materials and thermal insulators. copy;2023 IEEE. © 2023 IEEE.

关键词： Nanowires

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A Multiscale Parametric Study to Drug Delivery Modeling in Stented Arteries 46

A Multiscale Parametric Study to Drug Delivery Modeling in S...

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46th Annual International Conference of the IEEE engineering in Medicine and Biology Society, EMBC 2024

作者： Pleouras, Dimitrios S. Loukas, Vasileios S. Karanasiou, Georgia S. Antonaki, Anastasia Fotiadis, Dimitrios I. Sakellarios, Antonis I. University of Ioannina Dept. of Materials Science and Engineering Ioannina Greece University of Ioannina Biomedical Resarch Institute FORTH-IMBB Unit of Medical Technology and Intelligent Information Systems Dept. of Materials Science and Engineering IoanninaGR 45110 Greece University of Ioannina Unit of Medical Technology and Intelligent Information Systems Dept. of Materials Science and Engineering Ioannina Greece University of Patras Dept. of Mechanical and Aeronautics Engineering Patras Greece

ISBN: (纸本)9798350371499

The aim of this work is to investigate the dynamic behavior of retinoic acid concentration within the coronary artery, examining its distribution both on the stent and to the lumen and the arterial wall. The study aims to elucidate the effect of various factors, including variations in retinoic acid concentration on the stent, the applied blood flow velocity as boundary condition within the lumen, the polymer layer porosity, the arterial wall porosity and the drug permeability. Through a comprehensive analysis of these factors, this research seeks to advance the understanding of how retinoic acid behaves in the complex environment of the coronary artery, offering valuable insights into potential therapeutic applications and advances in cardiovascular medicine. To do this, a multiscale computational model for drug delivery is employed and applied in a stented arterial segment. 3D reconstruction of the arterial artery was achieved using optical coherence tomography (OCT) and X-ray angiography. The positioning of stent geometry was performed using finite element modeling of stent deployment. The results demonstrate that changes to important parameters of the model lead to significant changes to the drug *** Relevance: The importance of this work is related to the development and design of new coronary stents and potentially consider the patient's phenotype and provide personalized applications. © 2024 IEEE.

关键词： Optical coherence tomography

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