Investigation of creep behaviour under load during indentation experiments and its influence on hardness and modulus results

Chudoba, T.; Richter, Frank

doi:10.1016/s0257-8972(01)01340-8

Cited by 283 publications

(142 citation statements)

References 2 publications

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“…For a given load during loading, the indentation depth increases with decreasing loading rate. When unloading is sufficiently slow, the indentation depth continues to increase after the force reaches the maximum, resulting in a ''bulge'' or ''nose'' in the unloading curve, which has also been observed experimentally [230][231][232][233]. This bulge is the consequence of the continuing forward movement of the indenter during the early stage of unloading.…”

Section: Finite Element Calculations Of Loading-unloading Curves For mentioning

confidence: 63%

Scaling, dimensional analysis, and indentation measurements

Cheng

2004

Materials Science and Engineering: R: Reports

932

512

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We provide an overview of the basic concepts of scaling and dimensional analysis, followed by a review of some of the recent work on applying these concepts to modeling instrumented indentation measurements. Specifically, we examine conical and pyramidal indentation in elastic-plastic solids with power-law workhardening, in power-law creep solids, and in linear viscoelastic materials. We show that the scaling approach to indentation modeling provides new insights into several basic questions in instrumented indentation, including, what information is contained in the indentation load-displacement curves? How does hardness depend on the mechanical properties and indenter geometry? What are the factors determining piling-up and sinking-in of surface profiles around indents? Can stress-strain relationships be obtained from indentation load-displacement curves? How to measure time dependent mechanical properties from indentation? How to detect or confirm indentation size effects? The scaling approach also helps organize knowledge and provides a framework for bridging micro-and macroscales. We hope that this review will accomplish two purposes: (1) introducing the basic concepts of scaling and dimensional analysis to materials scientists and engineers, and (2) providing a better understanding of instrumented indentation measurements. # 2004 Published by Elsevier B.V.

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Section: Finite Element Calculations Of Loading-unloading Curves For mentioning

confidence: 63%

Scaling, dimensional analysis, and indentation measurements

Cheng

2004

Materials Science and Engineering: R: Reports

932

512

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“…However, with this assumption, an error occurs in determination of the mechanical properties of polymers due to their time and rate dependent behavior. Therefore, in order to eliminate the error in viscous materials, it is common to hold the indenter at the maximum load for a period of time [42], [43]. In the current study, a holding time of 10 s was selected to minimize the likely error due to the time dependent behavior of the material.…”

Section: Methodsmentioning

confidence: 99%

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

Karimzadeh¹,

Ayatollahi²,

Shirazi³

2014

IJMMM

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Abstract-The aim of this study was to evaluate the influence of thermocycling on the mechanical properties of a commercial dental nanocomposite by using the nano-indentation experiment. The resin-based nanocomposite contained silica and zirconia nanofillers. Some disk specimens, each with the diameter of 10 mm and the thickness of 4 mm were prepared and the specimens were stored at various environmental conditions. Some of the samples were kept in the ambient condition, other samples were stored in distilled water at room temperature and other ones were thermocycled in distilled water for 1000 cycles between 5°C and 55°C. After preparation of samples, the nano-indentation test was applied on the prepared specimens by Triboscope setup. Then the modulus of elasticity and hardness of the test samples were calculated from the Oliver-Pharr's method using the data obtained from nano-indentation test. The present research showed that the samples stored in distilled water without thermocycling exhibited the highest elasticity modulus when compared to the other samples. In addition, the maximum hardness was observed for thermocycled specimens in distilled water.

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“…3(a). The holding period was applied to allow creep, if any [33], so that the unloading data would have any effects of the viscoelastic behavior of limestone. The results did not show any creep at constant load, indicating that the limestone is fairly elastic.…”

Section: Specimen Preparation and Testmentioning

confidence: 99%

Nanoindentation Test Integrated with Numerical Simulation to Characterize Mechanical Properties of Rock Materials

Ban

Karki

Kim

2014

Journal of Testing and Evaluation

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It is important to determine the mechanical properties of rock materials accurately from the viewpoint of the design, analysis, and modeling of various transportation infrastructure systems. Conventional methods have some drawbacks, including relatively inaccurate measurements, cumbersome testing-analysis processes, and high variability in measurements. A nanoindentation test integrated with a numerical modeling technique has been validated in other fields as an efficient and accurate tool for the characterization of the key mechanical properties of various irregularly shaped materials, such as the rock materials in this study. This paper presents an integrated experimental-numerical effort based on the nanoindentation measurement and finite-element modeling of a representative rock material, limestone. The experimental efforts, including specimen fabrication and laboratory tests, are presented, and the corresponding analyses of test results combined with the finite-element technique and linear interpolation to evaluate the property measurements are discussed. The elastic properties estimated from the nanoindentation test are similar to the simulation results, demonstrating the validity of the test method and modeling approach.The success of the proposed approach should facilitate the better design of mixtures and structures based on the more accurate characterization of the core material properties.

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Investigation of creep behaviour under load during indentation experiments and its influence on hardness and modulus results

Cited by 283 publications

References 2 publications

Scaling, dimensional analysis, and indentation measurements

Scaling, dimensional analysis, and indentation measurements

Mechanical Properties of a Dental Nano-Composite in Moist Media Determined by Nano-Scale Measurement

Nanoindentation Test Integrated with Numerical Simulation to Characterize Mechanical Properties of Rock Materials

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