scholarly journals Erratum: “Representative strain of indentation analysis” [J. Mater. Res. 20, 2225 (2005)] and “Limit analysis-based approach to determine the material plastic properties with conical indentation” [J. Mater. Res. 21, 947 (2006)]

2006 ◽  
Vol 21 (10) ◽  
pp. 2699-2700 ◽  
Author(s):  
Nagahisa Ogasawara ◽  
Norimasa Chiba ◽  
Xi Chen
Keyword(s):  
Limit Analysis ◽  
Research Articles ◽  
Typographical Error ◽  
Plastic Properties ◽  
Representative Strain ◽  
Correct Figure ◽  
Schematic Drawing ◽  
Indentation Analysis ◽  
Published Research ◽  
Conical Indentation

We like to take this opportunity to rectify an error in the schematic drawing in two of our recently published research articles. A typographical error of a number appeared in Fig. 5 of J. Mater. Res. 20, 2225 (2005), p. 2229 and in Fig. 2 of J. Mater. Res. 21, 947 (2006), p. 948: these two figures are the same schematic drawing. In both figures, the number “1” on the slopes should be changed to “2.” The correct figure is given as Fig. 1 in this erratum.

Limit analysis-based approach to determine the material plastic properties with conical indentation

2006 ◽  
Vol 21 (4) ◽  
pp. 947-957 ◽  
Author(s):  
Nagahisa Ogasawara ◽  
Norimasa Chiba ◽  
Xi Chen
Keyword(s):  
Limit Analysis ◽  
A Priori ◽  
Indentation Load ◽  
Rigid Plastic ◽  
Plastic Properties ◽  
Representative Strain ◽  
Polynomial Fit ◽  
Wedge Indentation ◽  
Indentation Analysis ◽  
Simple Limit

Representative strain plays an important role in indentation analysis; by using the representative strain and stress, the normalized indentation load becomes a function of one variable, which facilitates the reverse analysis of obtaining the material plastic properties. The accuracy of such function is critical to indentation analysis. Traditionally, polynomial functions are used to fit the function, which does not incorporate correct elastic/plastic limits and has no physical basis. In this paper, we have proposed a new limit analysis-based functional formulation based on the theoretical solutions of conical/wedge indentation on elastic and rigid plastic solids. It is found that both limits agree well with numerical results, and the new approach involves no—or at most one—fitting parameter, which can be obtained with much less effort compare with the traditional polynomial approach. Reverse analyses on five different materials have shown that the new and simple limit analysis-based formulation works better than the traditional polynomial fit. The new technique may be used to quickly and effectively measure material plastic properties for any conical indenter if the elastic modulus is known a priori.

An energy-based method to extract plastic properties of metal materials from conical indentation tests

2005 ◽  
Vol 20 (5) ◽  
pp. 1194-1206 ◽  
Author(s):  
Yan Ping Cao ◽  
Xiu Qing Qian ◽  
Jian Lu ◽  
Zhen Han Yao
Keyword(s):  
Stable Solution ◽  
Strain Hardening Exponent ◽  
Simple Method ◽  
Plastic Properties ◽  
Representative Strain ◽  
Plastic Materials ◽  
Wide Range ◽  
Indentation Tests ◽  
Elastoplastic Materials ◽  
Conical Indentation

Based on dimensional analysis and finite element computations, an energy-based representative strain for conical indentation in elastoplastic materials has been proposed to establish an explicitly one-to-one relationship between the representative stress σr, the indentation loading curvature C, and the ratio of reversible work We to total work Wt performed by the indenter, i.e., σr/C = F0(We/Wt), where σr is the flow stress corresponding to the representative strain. The relationship provides a very simple method to evaluate the representative stress σr from the three directly measurable quantities We, Wt, and C. Numerical examples and further theoretical analysis reveal that a unique, stable solution can be obtained from the present method for a wide range of material properties, including both highly plastic materials (e.g., Ni for which E/σy = 1070) and highly elastic materials (e.g., materials for which E/σy = 25 and n = 0.5), using indenters with different tip apex angles. Based on the representative strains and stresses given by two indenters with different tip apex angles, e.g., (σr,80, ϵr,80) and (σr,65, ϵr,65), the plastic properties of materials, i.e., the yield strength σy and strain hardening exponent n can be further determined.

scholarly journals Nano-Adsorbents for Cobalt Removal from Wastewater: A Bibliometric Analysis of Research Articles Indexed in the Scopus Database

Processes ◽  
2021 ◽  
Vol 9 (7) ◽  
pp. 1177
Author(s):  
Charikleia Prochaska ◽  
George Gallios
Keyword(s):  
Saudi Arabia ◽  
Scientific Work ◽  
Research Articles ◽  
Total Output ◽  
King Saud University ◽  
Cobalt Removal ◽  
Scopus Database ◽  
Prolific Authors ◽  
Work Impact ◽  
Published Research

In this study, a combined technique of bibliometric and social network analysis was applied on research articles, related to the application of nano-adsorbents for cobalt removal from wastewater, published in Scopus database up to 2020. The results revealed that the first relative research article appeared in the Scopus database in the year 2002. The total output of research articles reached 214 in the year 2020. Published research articles of the years 2014–2020, added up to 83.6% of total articles. King Saud University of Saudi Arabia, Chinese Academy of Science, and LUT University of Finland were found to serve as the gatekeepers who control information flows in the network of the most prolific institutions, while cooperation between China, Saudi Arabia, and United States was also identified. On average, the most prolific authors cooperated with five others, while the top 10 cited publications appeared to represent a sparse and weakly interconnected network of co-authors. Graphene oxide was the most prominent nano-adsorbent among the top 10 cited publications, and their respective co-citations network visualization helped in capturing the value of certain citations to the evolution of the research on the topic, putting thus scientific work impact assessment to a different perspective.

Determining Elastic-Plastic Properties of Al6061-T6 from Micro-Indentation Technique

2013 ◽  
Vol 592-593 ◽  
pp. 610-613
Author(s):  
Sina Amiri ◽  
Nora Lecis ◽  
Andrea Manes ◽  
Davide Mombelli ◽  
Marco Giglio
Keyword(s):  
Manufacturing Process ◽  
Optimization Procedure ◽  
Test System ◽  
Standard Test ◽  
Material Behavior ◽  
Plastic Properties ◽  
Representative Strain ◽  
Elastic Plastic ◽  
Dimensionless Analysis ◽  
Micro Indentation

Different approaches have been proposed in order to determine the material behavior of ductile materials. Since, the mechanical properties of a mechanical component are modified during manufacturing process due to plastic deformation, heat treatment and etc, a non-destructive indentation experimental procedure addressed to predict the elastic-plastic properties of material after manufacturing process is of interest. This is especially true for small size components where it is complex to extract specimens to test on standard test system. Based on dimensionless analysis and the concept of a representative strain, different approaches have been proposed to determine the material properties of power law materials by using indentation process. In this work, the Johnson-Cook (JC) constitutive model of the aluminum alloy Al6061-T6 is characterized by means of a well-defined optimization procedure based on micro-indentation testing and high fidelity finite element models and an optimization procedure but without the concept of dimensionless analysis and a representative strain. This methodology allows determining a set of JC constants for Al6061-T6. The obtained results have good agreement with parameters calibrated by means of universal standard tests and reverse engineering approach.

scholarly journals Stance and modals of obligation and necessity in academic writing

2020 ◽  
Author(s):  
Jean Parkinson
Keyword(s):  
Academic Writing ◽  
Research Articles ◽  
Student Writing ◽  
Modal Auxiliaries ◽  
Objective Meaning ◽  
Published Research

Abstract Variation has been demonstrated in modal use between written and spoken registers and between disciplines. This article investigates variation within a discipline by comparing modals of obligation and necessity used in three science genres. Obligation modals project strong authoritative stance, thus contrasting with the tendency in academic writing towards tentativeness. The modal auxiliaries must and should and quasi-modals have to and need to are investigated using student writing from the BAWE (British Academic Written English) corpus and a corpus of published research articles. Findings include a dearth of obligation modals in the empirical genres (research articles and laboratory reports). Also a greater prominence was found of dynamic modal meaning (where necessity arises from circumstances) rather than deontic meaning (where the necessity arises from human authority or rules). A further finding is the prominence of objective meaning in the science register compared with the International Corpus of English (Collins 2009a).

Research Roundup

2021 ◽  
Vol 27 (2) ◽  
pp. 116-118
Author(s):  
Karen Heggs
Keyword(s):  
Palliative Care ◽  
Research Articles ◽  
Published Research ◽  
Selection Of

Synopses of a selection of recently published research articles of relevance to palliative care

Research Roundup

2021 ◽  
Vol 27 (8) ◽  
pp. 428-430
Author(s):  
Laura Green
Keyword(s):  
Palliative Care ◽  
Research Articles ◽  
Published Research ◽  
Selection Of

Synopses of a selection of recently published research articles of relevance to palliative care

Research roundup

2019 ◽  
Vol 25 (7) ◽  
pp. 359-361
Author(s):  
Karen Heggs
Keyword(s):  
Palliative Care ◽  
Research Articles ◽  
Published Research ◽  
Selection Of

Synopses of a selection of recently published research articles of relevance to palliative care

Research Roundup

2019 ◽  
Vol 15 (6) ◽  
pp. 300-301
Author(s):  
Karen Harrison Dening
Keyword(s):  
Research Articles ◽  
Full Reference ◽  
Key Points ◽  
Published Research ◽  
Selection Of

Karen Harrison Dening provides a synopsis and brief review of a selection of recently published research articles that are of interest to neuroscience nurses, highlighting key points to keep you up to date. A full reference is provided for those who wish to read the research in more detail.

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