Material Design & Processing Communications最新文献_第10页

The application of soil mixture in concrete footing design using the linear regression model 基于线性回归模型的混合土在混凝土基础设计中的应用

Material Design & Processing Communications Pub Date : 2020-04-28 DOI: 10.1002/mdp2.179

Abdoullah Namdar

{"title":"The application of soil mixture in concrete footing design using the linear regression model","authors":"Abdoullah Namdar","doi":"10.1002/mdp2.179","DOIUrl":"10.1002/mdp2.179","url":null,"abstract":"The economical and safe design of a concrete footing is considered in geotechnical engineering projects. The selection appropriate dimension of the concrete footing is a critical decision that needs to be made by professional engineering, and the accuracy of this decision plays a vital role in the economical and safe design of a geotechnical engineering project. In this study, the engineering judgment for the width design of concrete footing when different soil mixture configuration is rested beneath the concrete footing guided using linear regression and histogram models. The size of 1 (m), 1.3 (m), 1.6 (m), 1.9 (m), 2.2 (m), and 2.5 (m) is numerically selected to design width of concrete footing. The linear regression analysis applied to predict economical footing width with higher accuracy in considering all soil mixture designs. The results reveal the higher width of the concrete footing exhibit with higher accuracy. In this study, the proposed models guide the geotechnical engineers in the selection suitable width of concrete footing in a geotechnical engineering project. This study makes the bridge between the analytical method and the application of soil mixture in concrete footing design. The prediction width of concrete footing with high accuracy supports economically a structure and enhances the stability of the structure as well.","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.179","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"96289988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Toughness performance of rubcrete seawalls 混凝土海堤的韧性性能

Material Design & Processing Communications Pub Date : 2020-04-25 DOI: 10.1002/mdp2.178

Anand Raj, Fathima Chelsea, Praveen Nagarajan

引用次数: 0

Transient simulation of failures during start-up and power cut of a solid oxide fuel cell system using multiphysics modeling 基于多物理场模型的固体氧化物燃料电池系统启动和断电故障瞬态仿真

Material Design & Processing Communications Pub Date : 2020-04-23 DOI: 10.1002/mdp2.177

Konrad W. Eichhorn Colombo, Vladislav V. Kharton, Filippo Berto, Nicola Paltrinieri

{"title":"Transient simulation of failures during start-up and power cut of a solid oxide fuel cell system using multiphysics modeling","authors":"Konrad W. Eichhorn Colombo, Vladislav V. Kharton, Filippo Berto, Nicola Paltrinieri","doi":"10.1002/mdp2.177","DOIUrl":"10.1002/mdp2.177","url":null,"abstract":"We investigate failure incidents of a solid oxide fuel cell (SOFC) system during start-up from ambient conditions as well as during operation around the design point, using numerical simulation with a view to performance and thermo-mechanical stresses. During start-up, which comprises heating and load ramping phases, the system's trajectory moves through a relatively large temperature range. The simulated failure scenarios include reversible operational discontinuities in terms of input parameters and irreversible hardware failures. Furthermore, we also present results for a complete power cut. A multiphysics modeling approach is used to couple thermal, electrochemical, chemical, and thermo-mechanical phenomena by means of time-dependent partial differential, algebraic, and integral equations. Simulations revealed that the system can smooth out thermal discontinuities that are within a few minutes, that is, within the range of its thermal inertia. However, during the initial phase of the start-up procedure, thermo-mechanical stresses are relatively high due to larger differences between the sintering (manufacturing) and operation temperature, which makes the system more susceptible to failure. This work demonstrates that a multiphysics approach with control- and reliability-relevant aspects leads to a realistic problem formulation and analysis for practical applications.","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.177","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"102885653","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Microstructure and properties of in-situ high entropy alloy/tungsten carbide composites by mechanical alloying. 原位机械合金化高熵合金/碳化钨复合材料的组织与性能

Material Design & Processing Communications Pub Date : 2020-04-15 DOI: 10.1002/mdp2.175

Rathinavelu Sokkalingam, Marek Tarraste, Kumar Babu Surreddi, Rainer Traksmaa, Veerappan Muthupandi, Katakam Sivaprasad, Konda Gokuldoss Prashanth

{"title":"Microstructure and properties of in-situ high entropy alloy/tungsten carbide composites by mechanical alloying.","authors":"Rathinavelu Sokkalingam, Marek Tarraste, Kumar Babu Surreddi, Rainer Traksmaa, Veerappan Muthupandi, Katakam Sivaprasad, Konda Gokuldoss Prashanth","doi":"10.1002/mdp2.175","DOIUrl":"10.1002/mdp2.175","url":null,"abstract":"Al0.1CoCrFeNi-high entropy alloy (HEA) /tungsten carbide (WC)metal matrix composite was successfully prepared by mechanical alloying and subsequent spark plasma sintering. The different volume fraction of WC was distributed evenly by varying the powder milling parameters from gentle milling (~1.37% WC) and intensive milling (~14.27% WC). Sintering of gently milled powder has resulted in the evolution of three-phased microstructure: α-fcc and Cr- rich σ-phase with some WC-phase distributed in the HEA matrix. On the other hand, the sintering of intensively milled powder has resulted in a two-phased microstructure: α-fcc phase with even and dense distribution of WC-phased particles without any Cr- rich σ-phase. The absence of σ-phase is attributed to a complete alloying of Cr in the HEA matrix. Microhardness analysis and compression test indicate that a ~ 13% difference in WC fraction has resulted in an enhancement in hardness (46%) and compressive strength (~ 500 MPa).","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89151768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Comparative Ib-value and F-function analysis of Acoustic Emissions from elementary and structural tests with marble specimens 大理岩基本和结构试验声发射的比较b值和f函数分析

Material Design & Processing Communications Pub Date : 2020-04-14 DOI: 10.1002/mdp2.176

Andronikos Loukidis, Dimos Triantis, Ilias Stavrakas, Ermioni D. Pasiou, Stavros K. Kourkoulis

{"title":"Comparative Ib-value and F-function analysis of Acoustic Emissions from elementary and structural tests with marble specimens","authors":"Andronikos Loukidis, Dimos Triantis, Ilias Stavrakas, Ermioni D. Pasiou, Stavros K. Kourkoulis","doi":"10.1002/mdp2.176","DOIUrl":"10.1002/mdp2.176","url":null,"abstract":"Acoustic Emissions data recorded while marble specimens were subjected to various types of mechanical loading are analysed in the direction of detecting possible common characteristics that could be considered as fracture precursors. The tests carried out were either elementary (three-point bending and uniaxial tension) or structural ones (pure shear of marble blocks interconnected by means of metallic connectors). The data were analysed in terms of the Ib-value (improved b-value) and the F-function, paying special attention to the time interval just before fracture. The temporal variation of both the Ib-value and the F-function were plotted using logarithmic time scale, in terms of the time-to-failure parameter (tf − t) (where tf is the time instant of failure), since the specific way of presenting the data offers a deeper insight to what happens during the very last time interval before macroscopic fracture. The analysis indicated that both the Ib-value and the F-function provide clear indices designating entrance into the critical state, i.e., the state of impending fracture. In addition, it was concluded that a power law governs the behaviour of the Ib-value in the time interval before fracture and the exponent of this law seems to be somehow related to the loading scheme.","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"108923211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Failure prediction of impact behaviour of self-compacted rubcrete sleepers 自密实混凝土枕木冲击失效预测

Material Design & Processing Communications Pub Date : 2020-04-04 DOI: 10.1002/mdp2.174

Anand Raj, Praveen Nagarajan, Aikot Pallikkara Shashikala

引用次数: 1

In situ monitoring of the layer height in laser powder bed fusion 激光粉末床熔合层高度的现场监测

Material Design & Processing Communications Pub Date : 2020-04-04 DOI: 10.1002/mdp2.173

Richard J. Williams, Catrin M. Davies, Paul A. Hooper

引用次数: 5

Determination of stress concentration factor using applied element method 应用单元法测定应力集中系数

Material Design & Processing Communications Pub Date : 2020-03-15 DOI: 10.1002/mdp2.172

D. Lincy Christy, T.M. Madhavan Pillai, Praveen Nagarajan

引用次数: 0

Techniques for recording self-healing efficiency and characterizing the healing products in cementitious materials 胶凝材料中自愈效率的记录和愈合产物表征技术

Material Design & Processing Communications Pub Date : 2020-03-13 DOI: 10.1002/mdp2.166

Maria Stefanidou, Evangelia Tsampali, Georgios Karagiannis, Stamatios Amanatiadis, Andreas Ioakim, Spyridon Kassavetis

{"title":"Techniques for recording self-healing efficiency and characterizing the healing products in cementitious materials","authors":"Maria Stefanidou, Evangelia Tsampali, Georgios Karagiannis, Stamatios Amanatiadis, Andreas Ioakim, Spyridon Kassavetis","doi":"10.1002/mdp2.166","DOIUrl":"10.1002/mdp2.166","url":null,"abstract":"The self-healing mechanism of cementitious materials has been investigated by many researchers in the last two decades. In the journey of this quest, more and more advanced methods of analyzing the efficiency of healing have been employed. These methods are intended to clarify and quantify the healing mechanism. This paper presents five techniques, which are either common in the microstructure and nanostructure study or innovative in this field, which was used in order to identify the healing efficacy. Specifically, the application of scanning electron microscope (SEM) analysis, 3-D ultrasound tomography, nanoindentation, water absorption test (sorptivity), and software development in the Python programming environment for monitoring the crack closure have been used. The main objective of this study was to quantify several parameters, such as the geometry of the cracks, the properties of the healing products, as well as the healing depth. SEM analysis is a well-known technique that can contribute to identify the elements of the healing products and give the morphology of the surface. The methodology for nondestructive 3-D ultrasound tomography of healed specimens clarifies the ability of healing in depth. The nanoindentation technique enables localized contact response, which allows accurate estimates of the nanomechanical properties of the tested areas. The absorption method (sorptivity) is a representative method of recording cracks and open porosity. The software developed in a Python programming environment aimed at quantifying the surface crack closure and is an attempt to minimize the parameters that affect the inaccurate results, usually caused by the program's inability to detect only the crack. In addition, the results of each of the above methods are also presented, and their contribution to the study of healing is analyzed.","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.166","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"112744769","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: 7

Combination of compressive strength test and ultrasonic pulse velocity test with acceptable uncertainty 抗压强度试验与不确定度可接受的超声脉冲速度试验相结合

Material Design & Processing Communications Pub Date : 2020-03-02 DOI: 10.1002/mdp2.171

Stamatia Gavela, Nikolaos Nikoloutsopoulos, George Papadakos, Anastasia Sotiropoulou

引用次数: 4