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

Effects of synergism and multistep heating in graphene–polypyrrole–polymethyl methacrylate composites on their electrical and mechanical properties in additive manufacturing 增材制造中石墨烯-聚吡咯-聚甲基丙烯酸甲酯复合材料的增效和多步加热对其电学和力学性能的影响

Material Design & Processing Communications Pub Date : 2020-05-16 DOI: 10.1002/mdp2.182

Velram Balaji Mohan, Debes Bhattacharyya

{"title":"Effects of synergism and multistep heating in graphene–polypyrrole–polymethyl methacrylate composites on their electrical and mechanical properties in additive manufacturing","authors":"Velram Balaji Mohan, Debes Bhattacharyya","doi":"10.1002/mdp2.182","DOIUrl":"10.1002/mdp2.182","url":null,"abstract":"A highly electrically conductive hybrid multicomponent graphene–polymer composite was produced by solvent casting method with subsequent melt blending processes. As per the experimental design, the composite had to undergo multiple heating steps from solvent casting to extrusion to 3D-printing, the effects of processing conditions, mainly temperature, on its mechanical and electrical properties and the mechanisms behind the changes had to be understood. It has been noted that there is a significant increase in mechanical properties from extruded strand (tensile strength [48 MPa] and flexural strength [27 MPa]) to 3D-printed samples (tensile strength [67 MPa] and flexural strength [61 MPa]). An electrical conductivity of 11.4 S cm−1 was measured for the as-synthesised composite before melt processing. However, the conductivity does not change noticeably until 3D-printing. From the thermogravimetric analysis, it is clear that there is no change in the functionalities of extruded strands and 3D-printed sample, but energy dispersive spectroscopy analysis showed that there is a significant reduction in agglomerates that played a critical factor in improving the homogeneity of the dispersion.","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.182","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"109032692","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: 1

Application of the origami shape in the development of automotive crash box 折纸造型在汽车碰撞箱研制中的应用

Material Design & Processing Communications Pub Date : 2020-05-14 DOI: 10.1002/mdp2.181

Mario Boreanaz, Giovanni Belingardi, Ciro De Faria Maia

{"title":"Application of the origami shape in the development of automotive crash box","authors":"Mario Boreanaz, Giovanni Belingardi, Ciro De Faria Maia","doi":"10.1002/mdp2.181","DOIUrl":"10.1002/mdp2.181","url":null,"abstract":"The application of the origami geometry is proposed to shape the vehicle front crash box. A numerical and experimental study is developed to design innovative efficient thin-walled tubes used as crash box in the automotive field with the scope of absorbing energy in the initial phase of an impact event. This geometry consists of a preformed surface pattern that, when submitted to an axial load, collapses in a controlled progressive deformation of the structure and induces a homogenous folding. The goal pursued in adopting this particular geometry is to increase the amount of the energy absorption while using less material. Therefore, in addition to improving the performance of the component, it contributes to save material, weight, and space.The results reported in this paper confirm the potential of this origami geometry. The present study started with an extensive virtual analysis, followed by an experimental test campaign for confirmation. The virtual analysis initiated from a classic crash box, actually used on a car (that is our reference structure). Then an origami-shaped crash box has been developed with roughly the same dimensions. As a first step, a sensitivity analysis has been performed through the numerical study to identify the most effective design parameters. Finally, in order to obtain the experimental confirmation of the obtained results, an experimental crush test campaign on specimens with the same geometry studied numerically has been executed. Prototypes of the origami-shaped crash boxes were manufactured by steel sheet cold forming, cutting, and welding. Ten quasistatic axial crush tests were conducted in the FCA-LATAM laboratory in Belo Horizonte and correlation between the virtual and physical results assessed.","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"2 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.181","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134170181","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

Experimental investigation of the effects of infusing a foam into hydrogels on the hyperelastic coefficients 注入泡沫对水凝胶超弹性系数影响的实验研究

Material Design & Processing Communications Pub Date : 2020-05-09 DOI: 10.1002/mdp2.180

Hassan Mansour Raheem, Ahmed M. Al-Mukhtar

{"title":"Experimental investigation of the effects of infusing a foam into hydrogels on the hyperelastic coefficients","authors":"Hassan Mansour Raheem, Ahmed M. Al-Mukhtar","doi":"10.1002/mdp2.180","DOIUrl":"10.1002/mdp2.180","url":null,"abstract":"Hydrogels are viscoelastic material, soft and fragile materials that contain high water percent. These properties cannot sustain high axial compression loads. In this study, a foam was infused into hydrogel, agarose, to enhance the mechanical properties of the hydrogel/foam composite. Besides, it is difficult to measure the mechanical properties of the hydrogel alone specifically in tension because of the slipping in the grip during using the common tensile test. Therefore; the goal of this study is to investigate the influences of infused cellulose foam into the prepared hydrogels on the mechanical properties of the hydrogels by conducting the unconfined compression on hydrogel/foam composite and the hydrogel alone. It is also to utilize the strain energy density functions (SEDFs) to determine a suitable constitutive model that represents the nonlinear behavior of the materials. It is to predict the behavior of these materials out of range of the test (i.e., in tension) by implementing a finite elements analysis (FEA) using ABAQUS. The results showed that the strength of the hydrogel/foam composite was significantly greater than hydrogel alone. All hyperelastic models have well defined the nonlinear behavior of the experimental data. FEA results in tension are in good agreement with those predicted using hyperelastic models.","PeriodicalId":100886,"journal":{"name":"Material Design & Processing Communications","volume":"3 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1002/mdp2.180","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"92940582","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: 3

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