Temperature-based determination of the onset of yielding using a new clip-on device for tensile tests

Vitzthum, Simon; Hartmann, Christoph; Eder, M.; Volk, Wolfram

doi:10.1016/j.promfg.2019.02.166

Cited by 13 publications

(6 citation statements)

References 11 publications

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“…Consequently, high demands are made on the quality of the temperature signal in order to be able to work sensibly with the first derivative. In [21], YS0 was evaluated for several materials and the functionality could be shown. In this paper, the applicability of the method at different strain rates is shown and their standard deviations are given to further qualify the method.…”

Section: Resultsmentioning

confidence: 99%

“…Robustness and reproducibility of the parameters YS0 and YSTmin. In [21], based on an assumption, an evaluation method was presented that allows the determination of another elasticity parameter. It is assumed that at the point of time of the temperature minimum, the temperature increase caused by plastic deformation is in balance with the decrease caused by elastic loading.…”

Section: Resultsmentioning

confidence: 99%

“…In [21] a clip-on device was presented, which uses a PT1000 sensor to measure the specimen temperature during cyclic tensile tests with high precision. Furthermore, an additional yield stress parameter is determined by using a temperature-dependent evaluation method.…”

Section: Introductionmentioning

confidence: 99%

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Experimental Investigation of Factors Influencing the Determination of the Onset of Yielding by Temperature Measurement

Vitzthum

Gruber

Rebelo-Kornmeier

et al. 2022

KEM

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The cooling of the material during elastic tensile loading is well known as the thermoelastic effect. It is already known that the temperature minimum at the elastic-plastic transition can be used for the determination of the onset of yielding. Conceivable parameters for this have already been presented and investigated. Within this study factors influencing the specimen temperature during tensile loading and unloading are experimentally analyzed to improve the determination approach and the understanding of it. Furthermore, the robustness and repeatability of the measurement and evaluation procedures are analyzed. Therefore, cyclic tensile tests with the mild steel DC06 and the high strength steel CR590Y980T (DP1000) are performed with four PT1000 sensors applied on the specimen. The temperature behavior during elastic loading, elastic-plastic elongation and elastic unloading is separately evaluated. Different strain rates are investigated to better understand the strain-dependent heat development and its influence on the temperature-dependent evaluation. In this way, correlations between strain rate and thermal conduction due to prevailing temperature differences are found and their influence on the temperature-based determination of the onset of yielding is analyzed. Therefore, the yield stress at temperature minimum YSTmin as well as an additional yield stress at zero plastic strain YS0 are evaluated for all experiment settings. In a comprehensive experimental study, the standard deviations are compared and thus conclusions can be drawn about the robustness of the determination methods.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Experimental Investigation of Factors Influencing the Determination of the Onset of Yielding by Temperature Measurement

Vitzthum

Gruber

Rebelo-Kornmeier

et al. 2022

KEM

Self Cite

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“…Actually, very little cooling occurs because of the Joule-Thomson effect applied to metals. 34 In the second section (II), a strong rise of the current strength with a curvature change at the force maximum occurs. This can be traced back to a temperature raise until the end of the clean-cut formation.…”

Section: Punch Forcesmentioning

confidence: 98%

Thermoelectrically Based Approaches to Reduce Adhesive Wear During Blanking

Welm

Tröber

Weiß

et al. 2020

JOM

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Almost every metal mass product goes through a blanking process. Especially when processing aluminum, adhesive wear is the main determinant of cost efficiency. Many investigations on wear-influencing factors have been conducted so far, but one major determinant is almost unnoticed, thermoelectric phenomena. Due to the Seebeck effect, thermoelectricity arises in every blanking tool. Recently published investigations show that the combination of tool and workpiece materials has a strong influence on occurring thermoelectric currents and thus on adhesive wear development. This can be traced back to dependence of the current strength and direction on the materialspecific Seebeck coefficient. This article addresses the same phenomenon for a new parameter spectrum. Blanking experiments with aluminum EN AW 5083 were performed, investigating both thermoelectric currents and the amount of adhesive wear. Furthermore, the impact of external currents influencing the naturally occurring thermoelectricity on wear is shown. Improved measurements with a laser confocal microscope reveal a close correlation between the thermoelectric current profiles and adhesive wear pattern on the lateral surface of the punch. Together with a variation of tool material among highspeed steel 1.3343, stainless steel 1.4301 and cemented carbide CF-H40S, a strong relation between the Seebeck coefficients, electrical currents and tool wear could be found. Therefore, the actual findings confirm, deepen and extend previous results concerning thermoelectricity and adhesive wear.

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“…As a side note, thermoelastic phenomena also affect the temperature evolution during deformation. Due to the Joule–Thomson effect, elastic deformation can result in either a heating or cooling of the workpiece [ 5 ]. In the present work, the aforementioned phenomenon or degradation is not considered.…”

Section: Introductionmentioning

confidence: 99%

Plasticity-Induced Heating: Revisiting the Energy-Based Variational Model

Hartmann,

Obermeyer

2024

Materials

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Temperature evolution during plastic deformation is of great importance for the design of manufacturing processes, as well as for the analysis and prediction of tool wear. However, the results from experimental- and numerical-type research are still often contradictory. In this paper, we analyze methods for estimating plasticity-induced heating directly from displacement fields that can be recorded during experiments or extracted from simulation results. In terms of computational methodology, the thermodynamically motivated energy-based variational formulation of the coupled thermo-mechanical boundary-value problem is adapted to the problem at hand. Since an analysis of this variational formulation exhibits challenges and distinct inconsistencies with respect to the problem at hand, an alternative approach is proposed. This alternative approach is essentially a purely thermal finite element simulation, and it is conducted using a heat source term that is empirically based on the fraction of irreversible deformation work converted to heat. Our approach estimates plasticity-induced heating based on the strain and strain rate data derived from displacement fields. We therefore incorporate thermo-visco-plastic constitutive behavior (Johnson–Cook) with a thermodynamically motivated model that specifies the fraction of plastic work converted to heat (the Taylor–Quinney coefficient).

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Temperature-based determination of the onset of yielding using a new clip-on device for tensile tests

Cited by 13 publications

References 11 publications

Experimental Investigation of Factors Influencing the Determination of the Onset of Yielding by Temperature Measurement

Experimental Investigation of Factors Influencing the Determination of the Onset of Yielding by Temperature Measurement

Thermoelectrically Based Approaches to Reduce Adhesive Wear During Blanking

Plasticity-Induced Heating: Revisiting the Energy-Based Variational Model

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