Estimation of Fracture Toughness Using Flat-Ended Cylindrical Indentation

Seung-Hun, Choi; Kim, Junyeong; Jeon, Seung-Won; Choi, Min‐Jae; Kwon, Dongil

doi:10.1007/s12540-020-00753-2

Cited by 9 publications

(2 citation statements)

References 19 publications

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“…Xu et al [ 16 ] used flat cylindrical indentation to determine the creep behavior of Ni-based single crystal superalloys. An indentation technique with a nearly flat tip indenter was used by Midawi et al [ 17 ] to measure the anisotropy of yield strength in API-X80 line pipe welds, while Kim et al [ 18 ] derived fracture toughness by assuming that the load–depth curve of the indentation test is the same as the load–displacement curve of the Cracked Round Bar (CRB) test. Flat-ended punch nanoindentation has been used to determine the interface strength in brittle matrix composites through single fiber push out tests [ 19 ] and to study the mechanical behavior of carbon–carbon composites [ 20 ] and thin films [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Flat-Top Cylinder Indenter for Mechanical Characterization: A Report of Industrial Applications

Montanari

Varone

2021

Materials

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FIMEC (flat-top cylinder indenter for mechanical characterisation) is an instrumented indentation test employing a cylindrical punch. It has been used to determine the mechanical properties of metallic materials in several applications of industrial interest. This work briefly describes the technique and the theory of indentation with a flat-ended punch. The flat indentation of metals has been investigated through experimental tests, and an equation has been derived to calculate the yield stress from the experimental data in deep indentation. The approach is supported by many data on various metals and alloys. Some selected case studies are presented in the paper: (i) crank manufacturing through pin squeeze casting; (ii) the evaluation of the local mechanical properties in a carter of complex geometry; (iii) the qualification of Al billets for extrusion; (iv) stress–relaxation tests on CuCrZr heat sinks; (v) the characterization of thick W coatings on CuCrZr alloy; (vi) the measure of the local mechanical properties of the molten-zone (MZ) and the heat-affected zone (HAZ) in welded joints. The case studies demonstrate the great versatility of the FIMEC test which provides information not available by employing conventional experimental techniques such as tensile, bending, and hardness tests. On the basis of theoretical knowledge and large amount of experimental data, FIMEC has become a mature technique for application on a large scale in industrial practice.

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Section: Introductionmentioning

confidence: 99%

Flat-Top Cylinder Indenter for Mechanical Characterization: A Report of Industrial Applications

Montanari

Varone

2021

Materials

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“…Instrumented indentation testing (IIT) is an increasingly popular method because it is non-destructive and the test procedure is simple. In addition, it can be used in the field and can be used to assess various other mechanical properties as well [3][4][5][25][26].…”

Section: Introductionmentioning

confidence: 99%

A Further Study on Knoop Indentation Plastic Deformation for Evaluating Residual Stress

Lee¹,

Kim²,

Kim³

et al. 2020

Korean J. Met. Mater.

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A method for evaluating residual stress using an instrumented indentation test was developed some decades ago. More recently, another method was developed, using a Knoop indenter. The conversion factor ratio, which is one of the key factors in the evaluation algorithm, has been taken to be 0.34, although this value comes from an experimental result and its physical meaning has not been examined. Here we examine the physical meaning of this conversion factor from the previous residual stress model, and calculate its ratio using analytical model of the stress field beneath the indenter. In this process, we assumed that the conversion factor ratio was the ratio of the projected area of the plastic zone generated during the Knoop indentation test. An analysis of the stress field beneath the indenter was performed by FE simulation. Actual nanoindentation was conducted after Knoop indentation testing, using the interface-bonding technique, to identify the plastic zone. In addition, the conversion factor ratio was also calculated for the case where residual stress was present, and the geometric ratio of the Knoop indenter was different. A comparison of our results with those from previous studies showed that the conversion factor ratio obtained using our assumption was in good agreement with previous studies.

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Equivalent-Volume Model: Estimating Contact Morphology of Spherical Indentation for Metallic Materials

Kim,

Kwon,

Lee

et al. 2023

Met. Mater. Int.

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Estimation of Fracture Toughness Using Flat-Ended Cylindrical Indentation

Cited by 9 publications

References 19 publications

Flat-Top Cylinder Indenter for Mechanical Characterization: A Report of Industrial Applications

Flat-Top Cylinder Indenter for Mechanical Characterization: A Report of Industrial Applications

A Further Study on Knoop Indentation Plastic Deformation for Evaluating Residual Stress

Equivalent-Volume Model: Estimating Contact Morphology of Spherical Indentation for Metallic Materials

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