Investigation on partition of plastic work converted to heat during plastic deformation for reactor steels based on inverse experimental-computational method

Fekete, Balázs; Szekeres, András

doi:10.1016/j.euromechsol.2015.05.002

Cited by 21 publications

(8 citation statements)

References 14 publications

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“…Similar work was conducted by Galán et al for Ti6Al4V [22] and Jovic et al for 304L stainless steel and 5754 aluminium alloy [23]. A strong dependence on strain rate was noted in the work of Fekete for 15Ch2MFA (bainitic structure with fine grains) reactor steel, although 08Ch18N10T (austenitic structure with coarse grains) showed negligible levels of loading rate dependency [16]. Multi-phase (Martensite and Austenite) 304 stainless steel materials were analysed by Zaera [24].…”

Section: An Overview Of Thermoelastic and Thermoplastic Phenomenonmentioning

confidence: 65%

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Investigations into Taylor-Quinney coefficient determination for a 7000 series aluminium alloy using a novel small specimen test technique

Rouse

Hyde

Kazakeviciute

2018

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Thermo-mechanical coupling is a critical component in the thermodynamics of irreversible processes and is related to the dissipation of thermal energy during plastic straining. The Taylor-Quinney coefficient may be thought of as a ratio between thermally dissipated energy and plastic work, thereby giving insight into the thermomechanical coupling term. The inclusion of this parameter in a meaningful way is complicated by the various dependencies that the Taylor-Quinney coefficient may be subject to (e.g. loading rate and temperature). Determination of these dependencies is usually achieved through extensive experimentation, wherein temperature variations are monitored (with reference to an unloaded control sample) in a test piece during mechanical loading. There are practical limitations in full size testing methods however, not least relating to the location of full sized control and loaded samples in an environment chamber/furnace while simultaneously maintaining (control sample) temperature uniformity and high resolution temperature measurement (in the loaded sample). The present work details a method based on a novel small specimen testing technique that is currently under development at the University of Nottingham. A small ring of 7175-T7351 aluminum alloy (approximately 10mm in diameter and 2mm in thickness) is loaded between two pins at room temperature, with the local specimen temperature field monitored during monotonic deformation using an infra-red thermal camera. Experimental results are compared for different pin loading rates (namely 0.1mm/s, 1mm/s, and 10mm/s), with particular emphasis placed on localised temperature variations in areas of expected high plasticity. Differences of approximately 0.6°C were observed between 0.1mm/s and 1mm/s tests, with higher temperatures recorded in the latter. Higher temperatures were also noted at small specimen locations associated with localised plasticity. Fundamental thermal material properties are reported for the 7175 alloy in order to facilitate future analysis and heat equation solution efforts (working towards Taylor-Quinney coefficient determination).

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Section: An Overview Of Thermoelastic and Thermoplastic Phenomenonmentioning

confidence: 65%

“…Note lower case terms used in this section relate to specific quantities. It is of course easy to show that the fraction of stored energy, η, is related to β by η=1-β [16]. Care must however be taken when defining β.…”

Section: An Overview Of Thermoelastic and Thermoplastic Phenomenonmentioning

confidence: 99%

Investigations into Taylor-Quinney coefficient determination for a 7000 series aluminium alloy using a novel small specimen test technique

Rouse

Hyde

Kazakeviciute

2018

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“…where q v is the internal heat source related to the billet plastic deformation, which can be expressed in the following form [24]:…”

Section: Establishment Of Ihtc Computing Modelmentioning

confidence: 99%

Determination of interfacial heat transfer coefficient for TC11 titanium alloy hot forging

Wang

Geng

et al. 2017

Heat Mass Transfer

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“…The works [6][7][8] demonstrate the advantages of considering temperature dependent material properties along with nonlinear kinematic hardening. The special focus on the amount of plastic work transformed to heat and calibration to experiments is emphasised in [12,30].…”

Section: Introductionmentioning

confidence: 99%

“…Fig 12. Comparison of the temperature distribution T (x) at initial temperature T 0 = 20 • C and averaged shear rates γxy…”

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confidence: 99%

A thermo-viscoplasticity model for metals over wide temperature ranges- application to case hardening steel

2021

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In this contribution, a model for the thermomechanically coupled behaviour of case hardening steel is introduced with application to 16MnCr5 (1.7131). The model is based on a decomposition of the free energy into a thermo-elastic and a plastic part. Associated viscoplasticity, in terms of a temperature-depenent Perzyna-type power law, in combination with an isotropic von Mises yield function takes respect for strain-rate dependency of the yield stress. The model covers additional temperature-related effects, like temperature-dependent elastic moduli, coefficient of thermal expansion, heat capacity, heat conductivity, yield stress and cold work hardening. The formulation fulfils the second law of thermodynamics in the form of the Clausius–Duhem inequality by exploiting the Coleman–Noll procedure. The introduced model parameters are fitted against experimental data. An implementation into a fully coupled finite element model is provided and representative numerical examples are presented showing aspects of the localisation and regularisation behaviour of the proposed model.

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Investigation on partition of plastic work converted to heat during plastic deformation for reactor steels based on inverse experimental-computational method

Cited by 21 publications

References 14 publications

Investigations into Taylor-Quinney coefficient determination for a 7000 series aluminium alloy using a novel small specimen test technique

Investigations into Taylor-Quinney coefficient determination for a 7000 series aluminium alloy using a novel small specimen test technique

Determination of interfacial heat transfer coefficient for TC11 titanium alloy hot forging

A thermo-viscoplasticity model for metals over wide temperature ranges- application to case hardening steel

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