Effect of temperature and deformation rate on the hardness of copper

Krashchenko, V. P.; Oksametnaya, O. B.

doi:10.1007/bf01530061

Cited by 4 publications

(3 citation statements)

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“…6a, decreasing the temperature causes the hardness to increase. Krashchenko and Oksametnaya [22] using rigid rectangular pyramid sapphire indenter showed that the decreasing of the hardness of pure copper as the temperature testing increases from 290 to 1170 K. The similar trend also found by Huang et al [23], the hardness decreases from 4.4 to 0.8 GPa as the temperature increases from 83 to 333 K. Our predicted hardness at 85 K is close to these experimental values.…”

Section: Effect Of Temperature and Indenter Radiussupporting

confidence: 90%

Temperature and indenter radius effects on mechanical properties of copper during nanoindentation: a molecular dynamic simulation study

Sahputra

2021

Eur. Phys. J. B

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Molecular dynamics simulations of nanoindentation have been performed using a spherical indenter that penetrates a surface of an FCC copper model. The effects of the indenter radius and temperature on the mechanical properties and deformation mechanisms are investigated. Several deformation mechanisms, including atomic structural changes, dislocations, and pile-up of atoms around the indenter, are observed depending on the indenter radius and temperature. Increasing the simulation temperature decreases the hardness and reduced modulus. The reduced modulus decreases with the decreasing of the indenter radius while the hardness does not change significantly. MethodsThe copper sample used in the simulation contains 6806 atoms and the dimension is 148.215 × 148.215 × 3.615 0123456789().: V,-vol

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Section: Effect Of Temperature and Indenter Radiussupporting

confidence: 90%

Temperature and indenter radius effects on mechanical properties of copper during nanoindentation: a molecular dynamic simulation study

Sahputra

2021

Eur. Phys. J. B

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“…Indeed, this has been shown in several studies such as those of Saraswati et al 155 Vickers measured microhardness of 99.99% copper wires), Eksi and Kulecki 156 (72 Vickers measured micro-hardness of copper powder), and Poole et al 157 (micro-hardness of annealed and cold-worked copper polycrystals measured in excess of 160 Vickers). Moreover, copper shows increased hardness at higher strain rate, 158 although this has not been included in the model of this study. The work of Saraswati et al 155 is the most closely related to the present analysis, thus copper hardness was selected on the lower limit of their range, namely 90 Vickers.…”

Section: Copper Particles In Rolling Contactmentioning

confidence: 99%

“…157 (micro-hardness of annealed and cold-worked copper polycrystals measured in excess of 160 Vickers). Moreover, copper shows increased hardness at higher strain rate, 158 although this has not been included in the model of this study. The work of Saraswati et al.…”

Section: Experimental Validationmentioning

confidence: 99%

Debris particle indentation and abrasion of machine-element contacts: An experimentally validated, thermoelastoplastic numerical model with micro-hardness and frictional heating effects

Nikas

2012

Proceedings of the Institution of Mechanical Engineers, Part J:

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For a very long time, debris particles have been blamed to causing serious problems in machine-element contacts such as those of bearings and gears. This involves a huge number of mechanisms and machines worldwide. The financial cost associated with machinery failure under such circumstances is enormous. Past research has identified the main mechanisms governing damage from debris particles. A few theoretical models have been built on the experience accumulated on damage mechanics. The capabilities of said models vary a lot. The model originally developed by this author in the 1990s was recently expanded. The previous version of the model, which was published in this journal in May 2012, offered a number of innovative features to calculate spherical-particle indentation and soft abrasion in lubricated rolling-sliding contacts. It was experimentally validated following a rigorous programme. However, it neglected frictional heating from particle extrusion. This study significantly expands the previous model of the author by integrating thermal effects. It includes flash temperature calculations with moving sources of heat, dynamic heat partition, three-dimensional conduction and convection, and thermally anisotropic surfaces with temperature-dependent thermal and mechanical properties, all integrated in the elastoplastic model of indentation and abrasion. These are in addition to model features such as nonlinear strain hardening, strain-gradient plasticity, particle work hardening, generalised local kinematics, pile-up/sink-in plasticity effects and many more. The same rigorous experimental verification programme as in the previous model of the author is used here, too. It is shown that in some cases, the theoretical results on dent geometry are even closer to the experimental ones than with the isothermal model of the author. Furthermore, the thermal analysis reveals that extreme frictional heating can take place, often leading to melting wear in a fraction of a millisecond. The formation of dimples inside and outside main dents, which have been shown experimentally and verified theoretically by this author’s previous model, is revisited in light of frictional heating. A parametric study shows the effects of particle size and hardness, kinetic friction coefficients, and strain hardening on dent geometry and flash temperatures, including effects on particle and surface melting. Finally, the reality of flash temperatures is explored.

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Effect of particle and substrate preheating on particle deformation behavior in cold spraying

Wang

et al. 2013

Surface and Coatings Technology

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Effect of temperature and deformation rate on the hardness of copper

Cited by 4 publications

References 1 publication

Temperature and indenter radius effects on mechanical properties of copper during nanoindentation: a molecular dynamic simulation study

Temperature and indenter radius effects on mechanical properties of copper during nanoindentation: a molecular dynamic simulation study

Debris particle indentation and abrasion of machine-element contacts: An experimentally validated, thermoelastoplastic numerical model with micro-hardness and frictional heating effects

Effect of particle and substrate preheating on particle deformation behavior in cold spraying

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