Klassische Werkstoffkennwerte abschätzen / On the Estimation of Mechanical Properties Using the Universal Hardness Test

Heermant, Cornelia; Dengel, D.

doi:10.1515/mt-1996-380915

Cited by 3 publications

(1 citation statement)

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“…All published investigations have in common that compressive (residual) stresses increase the local hardness while tensile (residual) stresses lower it. During instrumented indentation the continuous measurement of the complete load-indentation depth curve (F-h-curve) is recorded, by which various materials parameters can be determined in addition to the hardness value itself [4][5][6]. However, characteristic for all these publications is that the effect of applied or residual stresses on the measured hardness or the registered F-h-curve has not been considered or included in the proposed analysis procedures.…”

Section: Introductionmentioning

confidence: 99%

Effect of Applied and Residual Stresses on the Analysis of Mechanical Properties by Means of Instrumented Indentation Techniques

Gibmeier

Hartmann²,

Scholtes

2005

MSF

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Various methods have been proposed in recent years for the determination of mechanical properties of a material by using instrumented indentation testing. These load and depth sensing indentation techniques imply the measurement of a characteristic load-indentation depth curve by the aid of which numerous materials properties can be extracted. On the other hand in many publications the effect of applied or residual stresses on the results of hardness readings is investigated. Methods are proposed to estimate applied or residual stresses by means of instrumented indentation testing. Based on this obvious inconsistency between these procedures on the use of information of instrumented hardness testing the influence of residual stresses as well as applied stresses on continuous microhardness readings is systematically investigated for steel samples. Experimental investigations were supplemented by finite element simulations of ball indentation tests on equi-biaxially prestressed materials states. These simulations show that the registered force-indentation depth curves as well as the geometry of the indentations are affected by loading and residual stresses in a characteristic way. For hardness values changes of up to 35% are determined with reference to the unstressed initial state.

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Section: Introductionmentioning

confidence: 99%

Effect of Applied and Residual Stresses on the Analysis of Mechanical Properties by Means of Instrumented Indentation Techniques

Gibmeier

Hartmann²,

Scholtes

2005

MSF

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Effect of the Scale Factor on the Elastic Modulus Determined by Instrumented Indentation

Matyunin,

Marchenkov,

Volkov

et al. 2023

Russ. Metall.

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Instrumented Indentation Test

Ullner¹

2011

Hardness Testing

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Instrumented indentation hardness testing significantly expands on the capabilities of traditional hardness testing. It employs high-resolution instrumentation to continuously control and monitor the loads and displacements of an indenter as it is driven into and withdrawn from a material. The scope of application comprises displacements even smaller than 200 nm (nano range) and forces even up to 30 kN . Mechanical properties are derived from the indentation load-displacement data obtained in simple tests. The chapter presents the elements of contact mechanics that are important for the application of the instrumented indentation test. The test method according to the international standard (ISO 14577) is discussed, and this information is supplemented by information about the testing technique and some example applications. The chapter concludes with a discussion on the extensions of the standard that are expected in the future (estimation of the measurement uncertainty and procedures for the determination of true stress-strain curves).

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Klassische Werkstoffkennwerte abschätzen / On the Estimation of Mechanical Properties Using the Universal Hardness Test

Cited by 3 publications

References 0 publications

Effect of Applied and Residual Stresses on the Analysis of Mechanical Properties by Means of Instrumented Indentation Techniques

Effect of Applied and Residual Stresses on the Analysis of Mechanical Properties by Means of Instrumented Indentation Techniques

Effect of the Scale Factor on the Elastic Modulus Determined by Instrumented Indentation

Instrumented Indentation Test

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