Adiabatic heating under various loading situations and strain rates for advanced high-strength steels

Klitschke, Silke; Trondl, Andreas; Huberth, F.; Liewald, Mathias

doi:10.1088/1757-899x/418/1/012123

Cited by 9 publications

(11 citation statements)

References 15 publications

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“…Moreover, the energy consumed on plastic deformation is divided into heat dissipated in the forming process and energy stored in the material [42][43][44]. The evolution of the microstructure during deformation depends on the type of material, the initial temperature and the loading situation [45,46]. Changing the deformation method usually leads to a partial or complete reconstruction of the dislocation systems formed in the previous stages of deformation and the formation of new systems [47,48].…”

Section: Experimental Investigationsmentioning

confidence: 99%

Full-Field Temperature Measurement of Stainless Steel Specimens Subjected to Uniaxial Tensile Loading at Various Strain Rates

et al. 2021

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This article presents a study on the effect of strain rate, specimen orientation, and plastic strain on the value and distribution of the temperature of dog-bone 1 mm-thick specimens during their deformation in uniaxial tensile tests. Full-field image correlation and infrared thermography techniques were used. A titanium-stabilised austenitic 321 stainless steel was used as test materials. The dog-bone specimens used for uniaxial tensile tests were cut along the sheet metal rolling direction and three strain rates were considered: 4 × 10−3 s−1, 8 × 10−3 s−1 and 16 × 10−3 s−1. It was found that increasing the strain rate resulted in the intensification of heat generation. High-quality regression models (Ra > 0.9) developed for the austenitic 321 steel revealed that sample orientation does not play a significant role in the heat generation when the sample is plastically deformed. It was found that at the moment of formation of a necking at the highest strain rate, the maximum sample temperature increased more than four times compared to the initial temperature. A synergistic effect of the strain hardening exponent and yield stress revealed that heat is generated more rapidly towards small values of strain hardening exponent and yield stress.

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Section: Experimental Investigationsmentioning

confidence: 99%

Full-Field Temperature Measurement of Stainless Steel Specimens Subjected to Uniaxial Tensile Loading at Various Strain Rates

et al. 2021

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“…In [1], the isothermal and adiabatic limit strain rates ̇ and ̇ are introduced as the lower and upper bound of the transition zone. Amongst others, Klitschke et al [3] suggest a twoparameter transition function:…”

Section: Estimating the Temperature Risementioning

confidence: 99%

“…Experimental results are shown as green squares with error bars. The proposed transition function is plotted as a solid green line while the previously proposed functions by [1] and [3] are shown in dashed curves.…”

Section: Estimating the Temperature Risementioning

confidence: 99%

“…Accurate modelling of this heat exchange requires transient thermomechanical analyses with complex boundary conditions. In an attempt to obtain meaningful engineering approximations without carrying out a full thermo-mechanical analysis, effective transition functions (so-called functions) have been proposed [1,3,5] to estimate the temperature evolution based on the results from a purely mechanical analysis. These functions introduce a strain rate dependent weighing factor to approximate the transition between the isothermal and adiabatic state.…”

Section: Introductionmentioning

confidence: 99%

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A strain-rate dependent engineering approximation of the temperature rise in plastically-deforming DP steel

Roth

Mohr

2021

EPJ Web Conf.

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Experiments at ten strain rates ranging from 0.001/s to 4/s are carried out on uniaxial tension specimens extracted from DP800 metal sheets. Digital Image Correlation (DIC) is used to obtain surface strain fields and a high speed infrared (IR) camera is employed to measure the corresponding temperature rise due to plastic dissipation. A temperature rise of 60K is witnessed for the highest loading speed whereas minimal temperature rise (<1K) is seen for the lowest loading speed. To minimize the computational cost by treating the temperature as an internal state variable, (effectively avoiding more complex coupled thermo-mechanical analyses), a logarithm based function is proposed that models the transition from isothermal to adiabatic conditions. The proposed function exhibits a higher accuracy compared to literature formulations.

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“…In the automotive industry, certain sheet forming processes require large strains ( ε > 0.3) and high strain rates ( trueε˙ > 1 s −1 ) (Semiatin, 2018). Combined together, these deformation parameters also cause heating of the blanks, dies and lubricants and their temperatures sometimes exceed 100°C at high strain rates (Gao et al., 2015; Klitschke et al., 2018). Although DP steels have ideal mechanical properties, they are limited in the sheet forming processes because of relatively low fracture strains (Lai et al., 2015).…”

Section: Introductionmentioning

confidence: 99%

Excessive damage increase in dual phase steels under high strain rates and temperatures

Çobanoğlu

Ertan

Şimşir

et al. 2020

International Journal of Damage Mechanics

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Damage formation in dual phase steels is a complex process and it may be sensitive to the deformation conditions and mechanisms. In this study, the damage parameter is measured and compared under quasi-static and industrial forming conditions (temperatures: 25 vs 200, 300°C and strain rates: 10−3 vs 10 s−1) for DP590 and DP800 steels. Resonance frequency and ultrasonic sound velocity techniques are utilized for the measurements to test the effectiveness and validity of each technique. At a given strain, the damage values can be up to 700% higher at industrial forming conditions, under which dynamic strain aging (DSA) controls the deformation behavior. DSA results in lower formability and is the likely mechanism responsible from the abnormal damage evolution. Measured damage parameters are also confirmed with the void fraction characterization by microscopy, which also provided details on the void shape and distribution with respect to the deformation conditions.

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Adiabatic heating under various loading situations and strain rates for advanced high-strength steels

Cited by 9 publications

References 15 publications

Full-Field Temperature Measurement of Stainless Steel Specimens Subjected to Uniaxial Tensile Loading at Various Strain Rates

Full-Field Temperature Measurement of Stainless Steel Specimens Subjected to Uniaxial Tensile Loading at Various Strain Rates

A strain-rate dependent engineering approximation of the temperature rise in plastically-deforming DP steel

Excessive damage increase in dual phase steels under high strain rates and temperatures

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