Effects of a Nano-composite Adhesive on Mechanical Properties of Tooth Enamel After Removing Orthodontics Bracket – an Experimental Study Using Nano-indentation Test

This paper will discuss two different techniques to measure mechanical properties of thin film, bulge test and nano-indentation test. In the bulge test, uniform pressure applies to one side of thin film. Measurement of the membrane deflection as a function of the applied pressure allows one to determine the mechanical properties such as the elastic modulus and the residual stress. Nano-indentation measurements are accomplished by pushing the indenter tip into a sample and then withdrawing it, recording the force required as a function of position. . In this study, modified King’s model can be used to estimate the mechanical properties of the thin film in order to avoid the effect of substrates. Both techniques can be used to determine Young’s modulus or Poisson’s ratio, but in both cases knowledge of the other variables is needed. However, the mathematical relationship between the modulus and Poisson's ratio is different for the two experimental techniques. Hence, achieving agreement between the techniques means that the modulus and Poisson’s ratio and Young’s modulus of thin films can be determined with no a priori knowledge of either.

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J0802-4-1 Mechanical properties of zirconia based electrolytes evaluated by nano-indentation test

The proceedings of the JSME annual meeting ◽

10.1299/jsmemecjo.2010.7.0_229 ◽

2010 ◽

Vol 2010.7 (0) ◽

pp. 229-230

Author(s):

Hideaki ITO ◽

Kazuhisa SATO ◽

Atsushi UNEMOTO ◽

Koji AMEZAWA ◽

Tatsuya KAWADA

Keyword(s):

Mechanical Properties ◽

Indentation Test ◽

Nano Indentation

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Experimental Study on Single-Layer Laser Cladding Feeding by Micro/Nano Composite Powders

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.562-565.958 ◽

2013 ◽

Vol 562-565 ◽

pp. 958-963

Author(s):

Ming Di Wang ◽

Shi Hong Shi ◽

Hong Yu Wang ◽

Cheng Feng Sun ◽

X.B. Liu

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Laser Cladding ◽

Single Layer ◽

Composite Powders ◽

Nano Composite ◽

Cladding Layer ◽

Nanocomposite Powders ◽

Better Than

Aimed at the lack of the cladding materials such as micro or nanopowder, the micro/nanocomposite powders prepared for experiment are feed directly, the key process parameters on the quality of the surface quality and microstructure analysis of the single-layer of laser cladding are studied in detail. Compared to the ordinary laser micro-cladding layer feeding by the micro powder, the cladding layer is more refined, which has more good mechanical properties. The results showed that: using reasonable parameters, the microstructure and macro-morphology of cladding layer with micro-nanocomposite powders feed directly are better than of micron powders.

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Factors Affecting Spherical Nano-Indentation of Thin Film/Substrate Systems

Volume 10: Micro- and Nano-Systems Engineering and Packaging ◽

10.1115/imece2014-36064 ◽

2014 ◽

Author(s):

A. Hossain ◽

A. Mian

Keyword(s):

Thin Film ◽

Mechanical Properties ◽

Mechanical Response ◽

Indentation Test ◽

Element Analysis ◽

Factors Affecting ◽

Nano Indentation ◽

Fea Modeling ◽

Soft Biological Materials ◽

Film Substrate

Great interests have been made over the last few years in the development of techniques to measure the mechanical properties of many engineering materials at the nano scale. In nano-indentation, a hard tip with known mechanical properties is pressed into a sample whose properties are unknown. The load, indentation depth and deformed area resulting from this test are then used to determine the desired mechanical properties, such as hardness and modulus. In this study, the computer-based finite element analysis (FEA) method is used to investigate factors effecting nano-indentation to ensure reliable measurement of thin film properties. First, the FEA method is used to predict the mechanical response of bulk aluminum (Al) using a spherical indenter. The numerical prediction is then compared with existing published results to validate the FEA modeling scheme. Once the model is validated, additional numerical analyses are conducted to investigate the response of Al-film deposited on different substrate materials. New mathematical formulations are proposed to determine the film modulus from nano-indentation test. The film modulus obtained from the new and existing mathematical formulations are also compared. Results obtained from this research can be used to characterize the mechanical properties of soft biological materials such as biofilm or tissue scaffolds.

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Study on Mechanical Properties of Carburized Layer Based on Nano-Indentation

Revue des composites et des matériaux avancés ◽

10.18280/rcma.310303 ◽

2021 ◽

Vol 31 (3) ◽

pp. 131-137

Author(s):

Zhenduo Sun ◽

Shifeng Wang ◽

Dongbo Hou

Keyword(s):

Mechanical Properties ◽

Pure Iron ◽

Indentation Test ◽

Experimental Result ◽

Displacement Curve ◽

Mechanical Parameters ◽

Nano Indentation ◽

Dimension Analysis ◽

Carburized Layer ◽

Load Displacement

The work aims to obtain the local mechanical parameters of carburized layer of CiNi steel. Tensile test and nano-indentation test were carried out for CrNi steel, stress-strain curve and load-displacement curve were then obtained. The finite element model of nano-indentation was built, and a model for obtaining the local mechanical parameters of carburized layer from load-displacement curve was established combined with dimension analysis. The mechanical parameters of pure iron and carburized layer of CrNi steel were calculated. The results show that, the dimension analysis model is accurate for predicting the mechanical properties of pure iron, the model accuracy is verified. The local mechanical parameters of carburized layer are predicted by the model, the simulated load-replacement curve based on the predicted mechanical parameters is in good agreement with the experimental result, it shows that the prediction result of the model is reasonable.

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