bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterisation of the mechanical failure and fracture mechanisms of single grain Y–Ba–Cu–O bulk superconductors
Authors: Congreve Jasmin V J , Shi Yunhua , Huang Kai Yuan , Dennis Anthony R , Durrell John H , Cardwell David A 
Published: November 2019

Abstract
The widespread use of melt processed, single grain (RE)–Ba–Cu–O bulk superconductors [(RE)BCO], where RE = Y, Gd or Sm, is limited predominantly by the poor mechanical properties of these inherently brittle, ceramic-like materials. The high density of flaws, such as cracks and voids, within the single grain microstructure leads directly to a low fracture toughness. As a result, the Lorentz forces, generated when these materials carry current in the presence of a large magnetic field, create stresses sufficiently large to cause brittle failure. The addition of Ba–Cu–O (liquid phase) and Ag to the precursor composition prior to melt-growth has been demonstrated to be effective in improving the mechanical properties of these technologically important materials. In this work, we characterise the mechanical failure of single grain YBCO bulk superconductors in terms of a Weibull statistical distribution. In addition, differences in fracture mechanisms have been studied to provide a better understanding of how the provision of additional liquid phase and silver produces YBCO single grains with better resulting mechanical properties and how these can be improved further.
The influence of hybrid nanostructures TiC/MWCNT concentration on the properties of bulk composites based on aluminum alloy
Authors: Aborkin A V , Khorkov K S , Kremlev K V , Ob`edkov A M , Sytschev A E 
Published: November 2019

Abstract
In this paper, we present the results of producing bulk composite materials based on aluminum alloy AlMg2, hardened 0.1-5 wt.% MWCNT and decorated with TiC nanoparticles by powder metallurgy method. Powder and bulk composites were characterized by electron microscopy, X-ray diffraction, kinetic indentation and compression tests. The influence of hybrid nanostructures TiC/MWCNT concentration on the properties of bulk composites was studied.
Image acquisition of the test-object by the CVL-10 copper vapor amplifier and optical bunch
Authors: Arakelyan S M , Galkin A F , Zhirnova S V , Shamanskaya E L 
Published: November 2019

Abstract
Images of the test object surface were obtained using a laser projection microscope and an optical bunch. Images of the surface of the test object at its different location in the experiment (the test object is located at the end of the optical bunch; the test object is located in a double focus lens; the test object is located after the optical bunch and optical system of two lenses) were obtained on the screen of a laser projection microscope.
Study of the effect of scanning speed in selective laser melting on the physicomechanical properties of samples.
Authors: Voznesenskaya A. , Zhdanov A. , Morozov V. 
Published: November 2019

Abstract
In this work, prototypes of aluminum alloy were obtained by the method of selective laser melting at different beam scanning speeds. Images of the powder material were obtained on a scanning electron microscope and the shape and size of the particles were investigated. The microstructure and defects were studied by metallographic analysis. Diagrams of the structure-phase composition of powder materials and samples obtained by the method of selective laser melting were obtained. The physical and mechanical properties of the images were also investigated.
Control of the alexandrite lasing spectrum
Authors: Putilov A G , Antipov A A , Shepelev A E , Lotin A A , Arakelyan S M 
Published: November 2019

Abstract
This paper discusses the use of dispersive optical elements as control devices for the wavelength of alexandrite laser. Some types of selective resonators are considered. The losses in the resonators with dispersive elements are described. The results of a dual-wavelength alexandrite lasing with an installed birefringent filter are presented.
Modeling of electrical conductivity of labyrinth bimetallic nanofilms
Authors: Bukharov D.N. , Kucherik A.O. , Arakelyan S.M. 
Published: November 2019

Abstract
In the framework of this paper, the results of experimental studies on the production of thin labyrinth bimetallic films, as well as measurement of ampere characteristics from volts, are presented. In addition, the simulation of their electrically conductive properties is done.
Study of properties and strength of no-fines concrete
Authors: JiaHao L , Chin Lian F , Hejazi Farzad , Azline Noor 
Published: November 2019

AbstractNowadays, special concrete is widely adopted in construction industry. No-fines concrete is a one of the special concrete which eliminate the use of fine aggregates in concrete mixing. The application of no-fines concrete has been introduced to construction industry especially pavement construction. Due to its high porosity behavior, the relative density of no-fines concrete is lower than normal concrete of 2400kg/m3which also helps in reducing dead weight in the design. In term of strength, no-fines concrete also gave lower compressive strength compared to normal conventional concrete. The aggregate/cement ratio also found to be a factor affecting its strength as it is depending on the interlocking or the strength of bonding between aggregate and cement. Also, concrete with varies mix ratio gives different has been studied for its physical and mechanical properties. In addition, there are further study of introducing fiber materials to determine the chance of enhancement in no-fines concrete study. By elimination of fines aggregates, the development and application of no-fines concrete in the construction industry will be more economical than normal concrete. This paper reviews and studies the performance characteristics and strength of no fine concrete based on previous researcher’s outcome.
Effects of soil-structure interaction on base-isolated structures
Authors: Aden M. A. , Al-Attar Alyaa A. , Hejazi F. , Dalili M. , Ostovar Nima 
Published: November 2019

Abstract
Structural integrity and seismic protection of the buildings against earthquake have been challenging among structural engineers. Many studies have been devoted to development of seismic isolators to improve the seismic behavior of civil structures. This study presents the analysis of building structures with SAP2000 considering soil structure interaction and base isolation effects under El Centro. Four different models are analyzed including fixed base structure, base isolated structure, frame supported by spring representing the soil and structure with combined base isolation and spring. The seismic results are investigated in terms of displacement, shear force, axial force, moment and drift of the columns and beams. It was observed that the soil structure interaction provides some flexibility to the structure by increasing the displacements of the structure and imposing internal forces variation to the system. Therefore, modeling base isolation together with consideration of soil structure interaction leads to better prediction of structural response.
Preliminary Modelling Assessment of Hydrodynamic Simulation due to Terengganu Airport Runway Extension
Authors: Yee Ling Soh , Veerasamy K. , Hidayat Jamal Mohamad , Shahrizal Ab Razak Mohd 
Published: November 2019

Abstract
Coastal erosion is a naturally phenomenon occurring result of the coastal hydrodynamic process. It is referring to the process of diminution, crafting and unloading of materials in coastal areas by agents such as waves, wind and tides. Erosion process becomes faster when there is activity on the waterfront development. To identify potential erosion caused by development, a study was conducted at the Terengganu Airport Runway extension. In this study, numerical modelling analyses were conducted to represent hydrodynamics using MIKE-21 software. The MIKE-21 is a comprehensive coastal modelling of software that simulates hydrodynamic, wave action, wind and tides. Modelling data input were obtained from National Hydraulics Research Institute Malaysia (NAHRIM) for the period of November 2009. Collected marine data were used as base for model calibration. Model calibration is with-in the acceptable confident level. Then, the calibrated model is used to predict the potential impact due to the Kuala Terengganu Airport runway extension.
Developing a Knowledge-based Decision Support System for Prefabricated Prefinished Volumetric Construction
Authors: Li Y S , Hwang B G , Shan M , Looi K Y 
Published: November 2019

Abstract
Prefabricated prefinished volumetric construction (PPVC) has a lot of advantages, including environmental protection, saving money, reducing on-site manpower and so on. Many countries advocate the development of PPVC, the decision making of PPVC construction becomes critical important. This study aims to developing a scoring approach based on Knowledge-Based Decision Support System (KBDSS) for PPVC implementation. To achieve this goal, 19 key decision-making factors (DMFs) were identified from literature reviews first, subsequently, a questionnaire survey was conducted on 41 construction organizations in Singapore and using a five-point rating scale. Then create a PPVC scoring approach by using the data from the questionnaire, this scoring approach will developing a program named KBDSS-PPVC, by using the Microsoft Excel and Microsoft Visual Basic for Applications (VBA). Finally, four industry experts will be invited to validate the feasibility of KBDSS-PPVC and scoring their current construction projects, this program can also give corresponding recommendations according the score. The results of validation showed the developed system really could provide some available suggestions for industry practitioners on the decision-making for PPVC implementation, this study complements the current knowledge system on PPVC decision-making and provides the basis for further research.
A S.W.O.T. Analysis of Green Procurement Implementation in Construction Projects
Authors: Bidin Z A , Bohari A A M , Rais S L A , Saferi M M 
Published: November 2019

Abstract
Green-related practices are widely implemented in various countries to ensure that problems related to the environment can be reduced. The concept of green-related practices and strategies were introduced and identified in providing the green procurement can be fully implemented in the Malaysian construction project. Green procurement concept is presented as one of the initiatives to support in reducing environmental issues throughout construction execution. Hence, this paper focuses on analysing the strengths and weaknesses of green procurement as well presented the opportunities and threats towards construction. Focus group discussion was conducted among green expert's participant who shares their experiences and point of views related to green procurement. The outcomes of this research findings offer plans and a clearer picture for practitioners in implementing green procurement practices in construction execution.
What are the factors behind the distinct character of Mosques in Turkey and Iran?
Authors: Kelly Tamara 
Published: November 2019

Abstract
Cities or its urban fabric and the characteristics architecture in many regions during various timescale is shaped by numerous factors. Among those factors are intangibles as political motivation, inspirations from other civilizations, religious influence. Whereas physical sways such as climate or geographical consideration or availability of materials and skilled labor are behind other great architecture creation. Therefore this article examines the impact of these factors in shaping the religious architecture in two vast neighboring countries Iran and Turkey. Iran is an immense country and its weather is variable and key factors in shaping a specific type of architecture while in Turkey, other influences are more dominant. The methodology of this paper is based on a literature review of various references and a theoretical analysis of several case studies in Iran and Turkey. This paper is an attempt to help students and researchers to understand how architects creates distinct architecture by acknowledgement of intangible forces.
Themes and Factors of Construction Safety Management for System Dynamic Model Interactions: A Systematic Review
Authors: Jasni Nur Azalini , Nordin Rumaizah Mohd , Ismail Zulhabri , Abdul Aziz Nurul Ayuni 
Published: November 2019

Abstract
The construction industry has always been regarded as a dangerous industry to work in, and the Malaysian construction industry is not exempted. Most safety and health studies conducted in this industry only view the overall factors contributing to the accidents or focus only on the main factor such as human behaviour. However, accidents actually happen based on the interaction between all the factors of the accidents at a construction site, and thus this study is conducted to identify the factors contributing to the accidents happening at construction sites and to classify them into their themes by using a systematic review method. This method is used to gather the empirical evidence regarding construction safety management by assessing academic journals mostly searched using keywords ‘construction safety management’, ‘themes of accidents’, ‘factors of accidents’ and ‘System Dynamic’ on academic journal databases known as ‘Google Scholar’, ‘Science Direct’ and ‘Academia’. The findings of this study identified 18 factors that contribute to the accidents and are classified into four (4) main themes which are human factors, management factors, technical factors and also environmental factors. The themes and factors identified in this study would contribute to develop a construction safety management system using System Dynamic model that will show the complex interactions between all the factors according to their themes.
Prediction of mechanical behaviour of an ultra-thin sheet metal under non-proportional loading using a crystal plasticity model
Authors: Bong H. J. , Lee J. , Lee M.-G. 
Published: November 2019

Abstract
A theoretical crystal plasticity model to predict mechanical responses of ultra-thin (<0.1 mm thick) sheet metal under non-proportional loading, which are difficult to measure experimentally due to premature buckling in simple shear or compression-tension test, was developed. In the model, three different dislocation density components, namely, forward, reverse and latent dislocations, were incorporated in the crystal plasticity model. The model was applied for 100 μm thick ultra-thin ferritic stainless steel sheet to predict mechanical responses under two-step tension, and the predicted results were compared with the experimental data.
Local fracture strain measurement in AHSS uniaxial flat tensile tests considering specimen geometry and fracture morphology
Authors: Larour P , Wagner L , Felbinger A , Angeli J 
Published: November 2019

Abstract
The local formability of AHSS sheet steels can be estimated by means of the relative average reduction of cross section area (or thickness) at fracture in flat tensile specimens. A 2D/3D characterization of tensile fracture shapes is performed with an optical stereo microscope for various typical fracture shapes. The initial width to thickness ratio (w0/t0) of flat tensile samples quantifies their non-proportionality behavior. A charpy like lower and upper shelf region with a highly scattered transition zone in between at a critical w0/t0 ratio is observed when plotting the fracture area or thickness reduction versus w0/t0 ratio. The higher the w0/t0 ratio of tensile specimens (samples wider, material thinner) the higher the local fracture strain level. The higher the material work hardening ability (n-value), the higher the critical w0/t0 ratio below which high scattering in thickness - and area reduction occurs. The local tensile fracture strain is therefore strongly dependent on specimen thickness, width and work hardening behavior. This is a severe drawback for a broader use of such tensile test based fracture strain measurements.
Effect of kinematic hardening on the yield surface evolution after strain-path change
Authors: Yang Yanfeng , Baudouin Cyrille , Balan Tudor 
Published: November 2019

Abstract
Abrupt strain path changes without elastic unloading have been used to investigate the yield surface of sheet metals, both experimentally and theoretically. These investigations emphasized an apparent non-normality phenomenon, following such a strain-path change. Subsequently, these results inspired the development of plasticity models including non-associated flow rules and non-normality theories. In this study, this type of abrupt strain-path changes is investigated using kinematic hardening models in the context of associated plasticity. The aim is to emphasize the contribution of kinematic hardening ingredient to the apparent violation of the normality condition. The results show that kinematic hardening slope and curvature of the material have a strong influence to contribute to this apparent non-normality.
Blockchain for forming technology – tamper-proof exchange of production data
Authors: Frey P , Lechner M , Bauer T , Shubina T , Yassin A , Wituschek S , Virkus M , Merklein M 
Published: November 2019

Abstract
An increasingly connected production in the sense of Industry 4.0 allows completely new possibilities in regard to improved and more efficient production and higher product quality. But a key factor to Industry 4.0 is a consistent data flow along the production chain. However, the exchange of data, especially between companies, still is a major obstacle to overcome in order to achieve the aforementioned advantages. Currently, there are increasing efforts to record and analyse data. But there is a lack of a holistic system to handle data, therefore commonly company databases or other inefficient methods are used. These solutions are limited with regard to data exchange since the ownership of data cannot be proven, production data has no unforgeable timestamp, which in turn hinders the generation of complete production history from the final product (e.g., car door) back to the semi-finished product (e.g., steel sheet). As a result, there is insufficient to no data exchange along the production chain. In order to solve these problems blockchain is a promising approach. At the Institute of Manufacturing Technology, an operational blockchain system was developed and implemented using standard production machines. With the combination of a quarto rolling mill and a 400t - press, representing the sheet metal supplier and a forming company, respectively, the typical process chain of sheet metal processing is represented, which allows the detailed investigation of the established blockchain in this field of application. Within this contribution, the conceptual approach of a blockchain system for forming technology will be presented. The nature and the classification of occurring data throughout the production chain will be addressed.
Local formability of AHSS: Measurement technique, specimen types and robustness
Authors: Gruenbaum M , Aydin G , Dettinger T , Heibel S 
Published: November 2019

Abstract
The recently proposed classification scheme for AHSS with global and local formability enables a material specific process development, allows a designation based on mechanical properties, as well as an assessment of various properties: deep drawability, edge-crack sensitivity, bendability, damage tolerance and fracture toughness. Local formability is measured by local fracture strains, e.g. area reduction at fracture or true thickness strain at fracture. Based on investigations of AHSS with strengths between 600 and 1000 MPa from different steel suppliers, this contribution addresses the influence of the measurement technique, of different specimen types and different sheet thicknesses on the measure for local formability. Furthermore, the correlation between true thickness strain at fracture and hole expansion ratio and also the hardness difference of the microstructure, as well as no correlation between local formability and bending angle according to VDA 238-100 are confirmed. It is shown that the influence of the measurement technique for true thickness strain at fracture is neglectable regarding the differentiation between the investigated grades. Using “uniaxial” tensile tests with specimen types 2 and 3 according to ISO 6892-1 one can obtain similar local fracture strains. Same states for the notched tensile tests with radii of 4 mm and 5 mm. The values gained by the smaller A30 mm specimen show slightly lower values compared to the “uniaxial” tensile specimen types. With increasing sheet thickness, a slight decrease in true thickness strain at fracture resulting from the combination of a changing width-to-thickness ratio of the tensile specimen and different microstructures can be seen. The large range of the measure for local formability using materials from different suppliers and different sheet thicknesses motivates the definition of requirements for material specifications and source approvals.
Characterizing damage and fracture of sheet metal materials using large scale test specimen
Authors: Jurendic Sebastijan , Anderson David 
Published: November 2019

Abstract
Several approaches to characterizing damage evolution and fracture behaviour of sheet metal materials are currently in existence. These are based on different testing methodologies and test specimen designs, some of which, when combined with higher sheet thicknesses used for aluminium alloys in the automotive field, can reach and exceed geometrical limits required for the plane stress assumption commonly applied to numerical modelling of sheet metal materials. Furthermore, if shell elements are to be used in modelling of such structures, the characteristic length of the element should be larger than the thickness of the modelled sheet material. In order to allow for element sizes accounting for the two considerations outlined above, new test specimen geometries covering a range of stress triaxialities have been developed with a deformation region significantly larger than that of other commonly used test specimen designs. The geometries have been manufactured and tested on an automotive grade AA6xxx series aluminium alloy with DIC strain measurement to determine failure strains. The results were then applied to finite element models using various element sizes and the behaviour of the numerical models compared to the test results.