Data-driven estimation of plastic properties of alloys using neighboring indentation test

The aim of this paper is to establish an approach to quantitatively determine the elasto-plastic parameters of the Mo-modified Ti obtained by the plasma surface alloying technique. A micro-indentation test is conducted on the surface under 10[Formula: see text]N. Considering size effects, nanoindentation tests are conducted on the cross-section with two loads of 6 and 8[Formula: see text]mN. Assuming nanoindentation testing sublayers are homogeneous, finite element reverse analysis is adopted to determine their plastic parameters. According to the gradient distributions of the elasto-plastic parameters with depth in the Mo-modified Ti, two types of mathematical expressions are proposed. Compared with the polynomial expression, the linear simplified expression does not need the graded material to be sectioned and has practical utility in the surface treatment industry. The validation of the linear simplified expression is verified by the micro-indentation test and corresponding finite element forward analysis. This approach can assist in improving the surface treatment process of the Mo-modified Ti and further enhancing its load capacity and wear resistance.

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Plastic properties determination using virtual dynamic spherical indentation test and machine learning algorithms

Journal of Mechanical Science and Technology ◽

10.1007/s12206-021-1230-8 ◽

2022 ◽

Author(s):

Mohammad Kashfi ◽

Sepehr Goodarzi ◽

Mostafa Rastgou

Keyword(s):

Machine Learning ◽

Learning Algorithms ◽

Indentation Test ◽

Machine Learning Algorithms ◽

Spherical Indentation ◽

Plastic Properties

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Determination of the Elastic-Plastic Properties of 15Kh2MFA Steel with Austenitic Cladding

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.586.43 ◽

2013 ◽

Vol 586 ◽

pp. 43-46 ◽

Cited By ~ 2

Author(s):

Aleš Materna ◽

Jiri Nohava ◽

Petr Haušild ◽

Vladislav Oliva

Keyword(s):

Tensile Test ◽

Indentation Test ◽

Strain Curve ◽

Indentation Load ◽

Spherical Indentation ◽

Compression Tests ◽

Material Interface ◽

Plastic Properties ◽

Longitudinal Orientation ◽

Sufficient Distance

The spherical indentation response of pressure vessel reactor steel with austenitic cladding is investigated both experimentally and numerically. The instrumented indentation test was performed for both materials at a sufficient distance from the bi-material interface, thus the results can be compared with the bulk data obtained from the standard tensile and compression tests. The stress – plastic strain curve for austenitic cladding estimated by a simplified inverse analysis of the indentation load – penetration curve is shifted to a harder response compared with that determined from the tensile test. One of the possible reasons, anisotropy of the cladding metal, was experimentally observed during the compression tests performed in the longitudinal orientation of the tensile test specimens and in the transverse orientation identical with the direction of the material indentation.

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A Novel Method to Extract the Plastic Properties of Metal Materials from a Continuous Spherical Indentation Test

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.734.206 ◽

2017 ◽

Vol 734 ◽

pp. 206-211 ◽

Cited By ~ 3

Author(s):

Zhuang Jin ◽

Jian Ping Zhao

Keyword(s):

Strain Hardening ◽

Indentation Test ◽

New Method ◽

Spherical Indentation ◽

Strain Hardening Exponent ◽

Computational Results ◽

Plastic Properties ◽

Novel Method ◽

Properties Of Materials ◽

Metal Materials

Cao and Lu had built a method to acquire the properties of materials. But they neglected the influence of strain hardening exponent n by introducing the representative strain which didan’t have any physical meaning. A new method from a continuous spherical indentation test was built, the influence of strain hardening exponent n were considered and the formulas of dimensionless functions defined in their work were improved in this present paper. Then the computational results from the new method and the actual results were compared and the error is about 8%.

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Measuring the plastic properties of bulk materials by single indentation test

Scripta Materialia ◽

10.1016/j.scriptamat.2005.09.009 ◽

2006 ◽

Vol 54 (1) ◽

pp. 65-70 ◽

Cited By ~ 83

Author(s):

Nagahisa Ogasawara ◽

Norimasa Chiba ◽

Xi Chen

Keyword(s):

Indentation Test ◽

Bulk Materials ◽

Plastic Properties

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J122012 Identification of Elastic-Plastic Properties of Metal Materials using an Indentation Test

The Proceedings of Mechanical Engineering Congress Japan ◽

10.1299/jsmemecj.2012._j122012-1 ◽

2012 ◽

Vol 2012 (0) ◽

pp. _J122012-1-_J122012-4

Author(s):

Junji SAKAMOTO ◽

Masayuki NAKAMURA ◽

Seiichi KUDO ◽

Takeshi KAZAMA ◽

Takashi KOSUGI ◽

...

Keyword(s):

Indentation Test ◽

Plastic Properties ◽

Elastic Plastic ◽

Metal Materials

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Effect of Displacement Rate on Sharp Millimeter Indentation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.715.111 ◽

2016 ◽

Vol 715 ◽

pp. 111-115 ◽

Cited By ~ 1

Author(s):

Hiroyuki Yamada ◽

Midori Hotta ◽

Nagahisa Ogasawara

Keyword(s):

Strain Rate ◽

Testing Machine ◽

Indentation Test ◽

Rate Dependence ◽

Strain Rate Dependence ◽

Displacement Rate ◽

Plastic Properties ◽

Microscopic Scale ◽

Static Indentation ◽

The Impact

Indentation is widely used to investigate the elastic and plastic properties of materials, which include strain rate dependence. However, the results of the general micro-indentation test were affected by the microscopic scale of materials (e.g., surface roughness, and crystal grain size distribution), since the displacement was small. In the present study, we develop the sharp millimeter indention expanded displacement without the microscopic scale of materials. Furthermore, the effect of displacement rate on the sharp millimeter indentation was evaluated using the quasi-static and impact indentation test. In this study, high purity aluminum, with 99.99 mass%, was selected as the material with strain rate dependence of strength. The quasi-static indentation test was performed using the universal testing machine at the displacement rate of 8.3×10-7 m/s, 8.3×10-6 m/s, and 8.3×10-5 m/s. The impact indention was carried out at the displacement rate of approximately 3×100 m/s. The loading curvature decreased with increasing displacement immediately after indentation, and then this value was convergent, regardless of the displacement rate. It was clear that this convergent value was affected by the displacement rate.

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Critical Penetration Depth for Nano/Micro Indentation Test to Determine Elastic-Plastic Film Properties Deposited on Hard Substrates

Volume 2: Automotive Systems, Bioengineering and Biomedical Technology, Fluids Engineering, Maintenance Engineering and Non-Destructive Evaluation, and Nanotechnology ◽

10.1115/esda2006-95143 ◽

2006 ◽

Author(s):

Norimasa Chiba ◽

Nagahisa Ogasawara ◽

Constantin Razvan Anghel ◽

Xi Chen

Keyword(s):

Penetration Depth ◽

Indentation Depth ◽

Indentation Test ◽

Apex Angle ◽

Film Material ◽

Element Analysis ◽

Plastic Properties ◽

Elastic Plastic ◽

Film Substrate ◽

Hard Substrates

The critical indentation depth to obtain proper elastic-plastic properties of thin film when the indentation tests are done on film/substrate system with sharp indenters is investigated. We focus on the characterization problem of soft film material, whose material properties are unknown, deposited on hard substrates. The critical depth is analyzed based on the finite element analysis (FEA) results. In order to extract the mechanical properties of the film from those of the film/substrate compound, we have to restrict the maximum penetration depth within a certain value. In this paper the relation between the load, P, and the depth, h, is analyzed in a power law relation, P = Chm, where the exponent m is a function of h. From extensive FEA results, we found that this exponent m starts to depart from 2 faster with increasing indenter apex angle and increasing hardening exponent of the film material. This means that the critical indentation depth decreases with increasing indenter apex angle and increasing hardening exponent. Based on this analysis, we propose a simple formula to evaluate the critical penetration depth h0, as a function of apex angle, θ, of the indenter: h0/d = 0.243cot θ, where d is the film thickness.

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Estimation of Residual Stress and Plastic Properties of a Material without Plastic Plateau by Using Continuous Spherical Indentation

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.795.409 ◽

2019 ◽

Vol 795 ◽

pp. 409-415

Author(s):

Zhan Yu Wang ◽

Jian Ping Zhao

Keyword(s):

Residual Stress ◽

Finite Element ◽

Model Simulation ◽

Indentation Test ◽

Element Model ◽

Spherical Indentation ◽

Strain Hardening Exponent ◽

Unknown Parameters ◽

Plastic Properties ◽

Response Parameter

This paper presents a method to allow the measurement of residual stress (), yield strength () and strain hardening exponent () of metal materials through continuous spherical indentation test. Based on the analysis of finite element simulation results, a new fitting equation between the indentation response parameter and the material properties was given. The influence of friction on finite element model simulation was also discussed when the residual stress is included in the material. Only three load values are required at each different indentation depths, and the three unknown parameters (, and ) can be obtained through corresponding dimensionless functions. Finally, the validation of the method presented in this paper was verified by simulating the material (SUS304) with the known material parameters in the literature.

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New sharp indentation method of measuring the elastic–plastic properties of compliant and soft materials using the substrate effect

Journal of Materials Research ◽

10.1557/jmr.2006.0384 ◽

2006 ◽

Vol 21 (12) ◽

pp. 3134-3151 ◽

Cited By ~ 19

Author(s):

Manhong Zhao ◽

Xi Chen ◽

Nagahisa Ogasawara ◽

Anghel Constantin Razvan ◽

Norimasa Chiba ◽

...

Keyword(s):

Finite Thickness ◽

Indentation Test ◽

Soft Materials ◽

Substrate Effect ◽

Plastic Properties ◽

Application Range ◽

Elastic Plastic ◽

Elastoplastic Properties ◽

Uniqueness Of The Solution ◽

Sharp Indentation

We propose a new theory with the potential for measuring the elastoplastic properties of compliant and soft materials using one sharp indentation test. The method makes use of the substrate effect, which is usually intended to be avoided during indentation tests. For indentation on a compliant and soft specimen of finite thickness bonded to a stiff and hard testing platform (or a compliant/soft thin film deposited on a stiff/hard substrate), the presence of the substrate significantly enhances the loading curvature which, theoretically, enables the determination of the material power-law elastic-plastic properties by using just one conical indentation test. Extensive finite element simulations are carried out to correlate the indentation characteristics with material properties. Based on these relationships, an effective reverse analysis algorithm is established to extract the material elastoplastic properties. By utilizing the substrate effect, the new technique has the potential to identify plastic materials with indistinguishable indentation behaviors in bulk forms. The error sensitivity and uniqueness of the solution are carefully investigated. Validity and application range of the proposed theory are discussed. In the limit where the substrate is taken to be rigid, the fundamental research is one of the first steps toward understanding the substrate effect during indentation on thin films deposited on deformable substrates.

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