scholarly journals Nanoindentation as a Method for Determining the Mechanical Properties of Cold Spray Coatings

2021 ◽  
Vol 23 (4) ◽  
pp. B250-B256
Author(s):  
Medard Makrenek
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Statistical Analysis ◽  
Experimental Design ◽  
Spray Distance ◽  
Spray Coatings ◽  
Statistical Selection ◽  
Input Parameters ◽  
Sprayed Coatings ◽  
Selection Of

The paper presents the methodology behind the statistical selection of input parameters using the example of spraying two cold-sprayed coatings. The Ti and Cr3C2-25(Ni20Cr)-Gr coatings were tested. Despite the large difference in the structure of these coatings, nanoindentation studies were carried out focusing on the nano hardness H and elastic modulus E. Based on the four input parameters and two output parameters, a 2-level factorial 2(k-p) experimental design was performed. The conducted analysis showed the significant influence of the spray distance on the H and E values in the case of the Ti coating. The input parameters of the spray distance and the type of carrier gas used turned out to be statistically significant in the case of the cermet coating. Taking into account the statistical analysis, the coatings were sprayed with modified values of the input parameters.

Effect of Powder Types on Mechanical Properties of D-Gun Coatings

1997 ◽  
Author(s):  
M.C. Kim ◽  
S.B. Kim ◽  
J.W. Hong
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Fracture Strain ◽  
Modulus Of Rupture ◽  
Special Device ◽  
High Fracture ◽  
Spray Coatings ◽  
Bend Tests ◽  
Point Bend ◽  
Four Point Bend Test

Abstract Mechanical properties of WC-Co D-Gun coatings produced from various powders were determined by using a four-point bend test equipped with a special device for strain measurements. The MOR(Modulus of Rupture), elastic modulus, fracture strain and toughness were measured from stress-strain curves using the four-point bend tests. The fracture strength values were increased in the order of clad, sintered, agglomerated(no densification), blended and cast & crushed powder coatings. The Co content blended with WC-Co cermet powders significantly increased fracture strain values and decreased elastic modulus values. It was found that the type of powder more significantly influenced the mechanical properties of D-Gun coatings than the composition of powders. The toughness of thermal spray coatings was increased by using WC-Co powders (high MOR) blended with self-fluxing alloy powders (high fracture strain).

Disclosing the Mechanical Properties of Green Calcium-Silicate-Hydrates by Statistical Nanoindentation Techniques

2011 ◽  
Vol 409 ◽  
pp. 544-549 ◽  
Author(s):  
Luca Sorelli ◽  
Daniel Vallée ◽  
Aali R. Alizadeh ◽  
James Beaudoin ◽  
Nicholas Randall
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Statistical Analysis ◽  
Calcium Silicate ◽  
Layer Structure ◽  
Cement Industry ◽  
Stoichiometric Ratio ◽  
New Class ◽  
Preliminary Work ◽  
Calcium Silicate Hydrates

In order to reduce CO2emissions, the cement industry has developed a new class cements. The Calcium-Silicate-Hydrates (CSH) that form are generally characterized by a low stoichiometric ratio for CaO and SiO2. This low C/S ratio affects the C-S-H layer structure and has a significant effect on the mechanical properties. This work exploits a novel statistical nanoindentation technique (SNT) to study the effect of the C/S ratio on the mechanical properties of synthetic CSH. Different CSH types were prepared by varying the C/S ratio of the starting materials. After undertaking a grid nanoindentation approach for each sample, the statistical analysis allowed extracting the mechanical properties, such as elastic modulus, hardness and creep. The results of this preliminary work shed new light on the implications of C-S-H stoichiometry on mechanical properties.

scholarly journals A Research on the Macroscopic and Mesoscopic Parameters of Concrete Based on an Experimental Design Method

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1627
Author(s):  
Hui Su ◽  
Hongliang Li ◽  
Baowen Hu ◽  
Jiaqi Yang
Keyword(s):  
Mechanical Properties ◽  
Elastic Modulus ◽  
Friction Coefficient ◽  
Experimental Design ◽  
Significant Influence ◽  
Interfacial Transition Zone ◽  
The Other ◽  
Stiffness Ratio ◽  
Response Surface Design ◽  
Surface Design

Concrete is a composite material that has complex mechanical properties. The mechanical properties of each of its components are different at the mesoscopic scale. Studying the relationship between the macroscopic and mesoscopic parameters of concrete can help better understand its mechanical properties at these levels. When using the discrete element method to model the macro-mesoscopic parameters of concrete, their calibration is the first challenge. This paper proposes a numerical model of concrete using the particle discrete element software particle flow code (PFC). The mesoscopic parameters required by the model need to be set within a certain range for an orthogonal experimental design. We used the proposed model to perform numerical simulations as well as response surface design and analysis. This involved fitting a set of mapping relationships between the macro–micro parameters of concrete. An optimization model was established in the MATLAB environment. The program used to calibrate the mesoscopic parameters of concrete was written using the genetic algorithm, and its macro-micro parameters were inverted. The following three conclusions can be drawn from the orthogonal test: First, the tensile strength and shear strength of the parallel bond between the particles of mortar had a significant influence on the peak compressive strength of concrete, whereas the influence of the other parameters was not significant. Second, the elastic modulus of the parallel bonding between particles of mortar, their stiffness ratio and friction coefficient, and the elastic modulus and stiffness ratio of contact bonding in the interfacial transition zone had a significant influence on the elastic modulus, whereas the influence of the other parameters was not significant. Third, the elastic modulus, stiffness ratio, and friction coefficient of the particles of mortar as well as the ratio of the contact adhesive stiffness in their interfacial transition zone had a significant influence on Poisson’s ratio, whereas the influence of the other parameters was not significant. The fitting effect of the response surface design was good.

Characterization of Mechanical Properties of TBCs via a Taguchi Experimental Design

2000 ◽  
Author(s):  
A. Kucuk ◽  
C.C. Berndt ◽  
U. Senturk ◽  
R.S. Lima
Keyword(s):  
Mechanical Properties ◽  
Regression Analysis ◽  
Elastic Modulus ◽  
Experimental Design ◽  
Yield Strength ◽  
Linear Regression Analysis ◽  
Spray Parameters ◽  
Taguchi Experimental Design ◽  
Multi Linear Regression ◽  
Point Bend

Abstract Experimental designs have been used by the thermal spray community to improve and optimize spray parameters to produce coatings with desired properties. The influence of four spray parameters including top and bond coat thicknesses, substrate temperature, and spray distance on the mechanical properties of plasma sprayed thermal barrier coatings has been examined. Two experimental matrices; (i) a four by nine according to a Taguchi experimental design, and (ii) a four by seventeen according to a full factorial design of the experiment, were developed. Six samples from each group were tested using a four point bend arrangement. Yield strength and elastic modulus were calculated from the four point bend test. A multi-linear regression analysis on yield strength and elastic modulus values from each experimental matrix was carried out to determine the influence of each spray parameter on these properties. The multi-linear regression analysis results for these two experimental matrixes are compared.

The Experimental Study of Early-Age Strength and Elastic Modulus of Concrete

2010 ◽  
Vol 163-167 ◽  
pp. 1192-1197 ◽  
Author(s):  
Deng Xiang Zhang ◽  
Wei Jun Yang
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Elastic Modulus ◽  
Statistical Analysis ◽  
Coefficient Of Variation ◽  
Early Age ◽  
Good Prediction ◽  
Construction Period ◽  
Large Numbers ◽  
Safety And Reliability

Based on large numbers of experiment results, this paper carries out statistical analysis and proposes the probability distribution properties of the random process of strength and elastic modulus and their coefficient of variation, and develops a new prediction model of early-age strength and elastic modulus and their coefficient of variation respectively. The model can provide good prediction of the development of mechanical properties of concrete structures in aging, and it is important to evaluate the concrete structure safety and reliability in the construction period.

Optimization of PES Nanocomposite Membrane Preparation Using Statistical Analysis and Experimental Design

2019 ◽  
Author(s):  
Yasin Orooji ◽  
Fatemeh Noorisafa ◽  
Nahid Imami ◽  
Amir R. Chaharmahali
Keyword(s):  
Statistical Analysis ◽  
Experimental Design ◽  
Factorial Design ◽  
Fractional Factorial Design ◽  
Fractional Factorial ◽  
Nanocomposite Membrane ◽  
Membrane Preparation ◽  
Membrane Fabrication

<p>Using experimental design and statistical analysis (½ Fractional Factorial Design), this study investigates the effect of different parameters in the membrane fabrication on the performance of nanocomposite PES/TiO<sub>2</sub> membrane. </p>

Application of experimental design for selection of optimal modes of electro-deformation cladding with a flexible tool

2020 ◽  
pp. 71-76
Author(s):  
M.A. Levantsevich ◽  
E.V. Pilipchuk ◽  
N.N Maksimchenko ◽  
L.S. Belevskiy ◽  
R.R. Dema
Keyword(s):  
Composite Material ◽  
Experimental Design ◽  
Statistical Models ◽  
Experiment Planning ◽  
Flexible Tool ◽  
Tool Coating ◽  
Coating Composite ◽  
Selection Of

Experimental-statistical models of the process of forming composite chromium coatings by electrodeformation cladding with a flexible tool are developed, which allow to determine the parameters of the regimes for obtaining coatings of the required thickness and roughness. Keywords electrodeformation cladding, flexible tool, coating, composite material, experiment planning, noncompositional plan, thickness, roughness. [email protected]

Elaboration and Characterization of the Properties of Refractory Cr Base Alloys

2010 ◽  
Vol 72 ◽  
pp. 46-52 ◽  
Author(s):  
Laurent Royer ◽  
Stéphane Mathieu ◽  
Christophe Liebaut ◽  
Pierre Steinmetz
Keyword(s):  
Mechanical Properties ◽  
Melting Point ◽  
Molten Glass ◽  
Energy Production ◽  
Creep Properties ◽  
Refractory Alloys ◽  
Industrial Use ◽  
Kinetics Of ◽  
Selection Of

For energy production and also for the glass industry, finding new refractory alloys which could permit to increase the process temperatures to 1200°C or more is a permanent challenge. Chromium base alloys can be good candidates, considering the melting point of Cr itself, and also its low corrosion rate in molten glass. Two families of alloys have been studied for this purpose, Cr-Mo-W and Cr-Ta-X alloys (X= Mo, Si..). A finer selection of compositions has been done, to optimize their chemical and mechanical properties. Kinetics of HT oxidation by air, of corrosion by molten glass and also creep properties of several alloys have been measured up to 1250°C. The results obtained with the best alloys (Cr-Ta base) give positive indications as regards the possibility of their industrial use.

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