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The role of the Mg_(17)Al_(12)-phase in the high-pressure die-cast magnesium-aluminum alloy system

Journal of Magnesium and Alloys 2023年第11期11卷 4235-4246页

作者： J.P.Weiler Meridian lightweight Technologies Canada

The Mg_(17)Al_(12)β-phase is highly influential to the performance of magnesium-aluminum high-pressure die-casting alloys. Numerous studies have investigated the effect of this phase on the room temperature and elevated-temperature mechanical properties as well as the corrosion,flammability, thermal conductivity and castability performance. This work summarizes the results of these works, as well as the studies that describe control of the Mg_(17)Al_(12)-phase through alloying additions that modify the microstructure and resulting alloy performance. The results of this work can be used as a basis for the development of alloying additions that enable modifications to the performance of high-pressure die-cast magnesium-aluminum-based alloys.

关键词： Magnesium alloys HPDC Alloy development Properties

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Data-driven placemaking: Public space canopy design through multi-objective optimisation considering shading, structural and social performance

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Frontiers of Architectural Research 2022年第2期11卷 308-323页

作者： Jeroen van Ameijde Chun Yu Ma Garvin Goepel Clive Kirsten Jeff Wong School of Architecture The Chinese University of Hong KongHong KongChina lightweight works Hong KongChina APS Research Ltd. Hong KongChina

In the context of ongoing densification of cities and aging urban populations,public spaces are a crucial infrastructure to support the physical and mental wellbeing of urban *** design of public space furniture elements is often standardised,and not considered in relation to environmental conditions and mechanisms of social *** article presents a digital workflow to generate site-specific designs for shaded public seating,considering the relationships of local public places to their surroundings.A strategy for customised and site-specific design is developed through the use of multiple software tools,employing evolutionary algorithms and multi-objective *** method is applied to a small public space canopy prototype installed within a public housing estate in Hong Kong,incorporating additional criteria to achieve a low-cost and light-weight *** multiple stages of refinement and optimisation,a material,structural and social performance-driven outcome was achieved that creates a shaded space for public seating,people watching and social *** part of a larger research agenda exploring architectural form-finding and environmental psychology,the project represents potential new applications in the emerging field of socially driven computational design.

关键词： Public space Tensile membrane structures Structural design Environmental performance Multi-objective optimisation Evolutionary algorithms

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Multi-criteria Decision of Type and Building Material for Simple House Construction

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Journal of Civil Engineering and Architecture 2013年第4期7卷 433-439页

作者： Wahyu Wuryanti Ministry of Public works Research Institute for Human Settlements Bandung 40008 Indonesia

Facing the innovation technology in building construction, the designer has the option in selecting the type of system construction and building materials. There is a big question for the designer and owner on how to evaluate the quality material to meet the technical requirements as building construction reliability. By demand to provide a low cost house, there is need for improving structure model and material construction for residents. When material cost takes 60%-70% of total construction cost, it is important to select the appropriate building material. Currently the innovation of material building for main frame and wall component has present for residential projects in Indonesia. Attempt to replace the traditional material such as brick or pozzolan lime concrete block is developed a new material include utilization of coal combustion waste for concrete block, lightweight concrete, or prefab panel wall. This paper presents the research result to develop a tool support for material and system construction selecting that facilitates the selection an optimal material for a simple house construction. A multi-criteria decision method is used based on performance criteria such as economy, reliability, comfort and eco-friend.

关键词： Multi-criteria decision building material simple house.

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Sound Insulation Performance of Acoustic Metamaterials Based on Attachable Helmholtz Resonators

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Transactions of Nanjing University of Aeronautics and Astronautics 2022年第S1期39卷 23-31页

作者： ZUO Hongwei LI Jinze SHEN Cheng YANG Shasha WANG Bin State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China Nanjing Center for Multifunctional lightweight Materials and Structures(MLMS) Nanjing University of Aeronautics and AstronauticsNanjing 210016P.R.China Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong Kong 999077P.R.China School of Mechanical Engineering Nanjing Vocational University of Industry TechnologyNanjing 210023P.R.China Suzhou DingYu Energy Saving Equipment Co. Ltd.Suzhou 215213P.R.China

To address the control of low frequency noises,we propose an new perforated thin-plate acoustic metamaterials with the attachable Helmholtz resonator(AHR)which can be directly attached to the existing structure to suppress acoustic *** transmission loss of the aluminium plate with AHR has been simulated using the finite element method under a normal incident plane sound *** results show that AHR works well in the 50—500 Hz frequency band,with two peaks of insulation occurring and the corresponding frequency of the first insulation peak dropping to around 120 *** study of the effects of plate thickness,cavity depth,perforation radius and perforation length on the sound insulation performance of metamaterials demonstrates that the effective suppression of acoustic radiation at specific frequencies can be achieved by changing the acoustic radiation properties of the structure.

关键词： Helmholtz resonator acoustic metamaterials transmission loss

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Modified Concrete Using Polyethylene Terephthalate Plastic Waste as a Partial Replacement for Coarse Aggregate

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Open Journal of Applied Sciences 2023年第6期13卷 896-909页

作者： Dodo Kayentao Moussa Tamboura Antoine Padou Diarra Mah Fatoumata Traore Adama Coulibaly Aboubacar Sidiki Toure Mohamed L. O. Diawara Kélétigui Daou Faculty of Sciences and Techniques (FST) University of Sciences Techniques and Technologies of Bamako Bamako Mali National Research and Experimentation Center for Buildings and Public works (CNREX-BTP) Bamako Mali National School of Engineering Abderhamane Baba TOURE (ENI-ABT) Bamako Mali

The present work evaluated the properties of modified concrete using polyethylene terephthalate (PET) bottle waste as a partial replacement for coarse aggregate. Modified concrete samples were designed using a water/cement (W/C) ratio of 0.50 and varying percentages of PET replacement (3%, 7%, 10%, and 15% by volume). Dreux Gorisse’s formulation approach was used to make the final products, and the mechanical properties of the samples were determined using Controlab presses. This modified concrete with PET chips has shown that with a 10% replacement of PET chips, the fresh density decreases by 3.56%, and the hardened state density decreases by 2.01%. The water absorption and thermal conductivity of the formulated concretes decreased. However, the results showed that the slump of these fresh concretes increased as the percentage of plastic aggregate replacement increased. Based on the results, incorporating PET aggregates into concrete contributes to good workability, and lightweight concrete structures, and provides some thermal comfort in concrete structures.

关键词： PET Waste Concrete Dreux Gorisse Approach Thermal Conductivity Mechanical Properties of Modified Concrete

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