In-situ analysis of the thermoelastic effect and its relation to the onset of yielding of low carbon steel

Vitzthum, Simon; Rebelo-Kornmeier, Joana; Hofmann, M.; Gruber, Maximilian; Maawad, Emad; Batista, A. C.; Hartmann, Christoph; Volk, Wolfram

doi:10.1016/j.matdes.2022.110753

Cited by 7 publications

(5 citation statements)

References 58 publications

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“…This effect is based on the principle that the change in temperature of a specimen can be affected by a changing volume as a result of an applied load. While elastic tensile loads result in cooling, elastic compressive loads cause the specimen to heat up 57–59 . Since the evaluation of the fatigue strength is made more difficult by the thermoelastic effect, the smoothed signal of the change in temperature is also shown in Figure 6, which makes it easier to recognise the first increase in the material response.…”

Section: Resultsmentioning

confidence: 99%

A nonlinear lifetime prediction method for un‐ and low alloyed steels by damage determination based on non‐destructive measurement techniques

Weber,

Maul,

Juner

et al. 2024

Fatigue Fract Eng Mat Struct

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Materials used in nuclear power plants are exposed to cyclic loading, which is why the understanding of fatigue behaviour is of great importance. Because of high time investments and resulting increased costs, Lifetime Prediction Methods, which significantly reduce the amount of specimen, have already been developed. Within this paper, the Lifetime Prediction Method MiDAcLifeincr is presented, which enables a determination of a trend S‐N curve in the High‐Cycle‐Fatigue‐regime based on only one fatigue test and the combination of conventional fatigue testing with NDT‐related measurement techniques. The process‐orientated monitoring of the cyclic deformation behaviour provides the basis for the time‐ and cost‐effective provision of fatigue data. Compared with previous methods, the consideration of variable loading is an essential aspect of the research application. The test material is a 20MnMoNi5‐5 steel, the results of which are extended to include other steels for validation reasons.

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Section: Resultsmentioning

confidence: 99%

A nonlinear lifetime prediction method for un‐ and low alloyed steels by damage determination based on non‐destructive measurement techniques

Weber,

Maul,

Juner

et al. 2024

Fatigue Fract Eng Mat Struct

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“…The strain measurement is done by a laser extensometer with a gauge length of 50 mm and a constant strain rate of 0.001 1/s. To determine the onset of yielding, the temperature based method according to Vitzthum et al [10] was employed. This method makes use of the thermoelastic effect where the temperature decreases during the elastic deformation and increases during the plastic deformation.…”

Section: Methodsmentioning

confidence: 99%

“…This method makes use of the thermoelastic effect where the temperature decreases during the elastic deformation and increases during the plastic deformation. A closer description of the method can be found in [10].…”

Section: Methodsmentioning

confidence: 99%

“…The onset of yielding is then determined at the intersection of the two lines and via an angle bisector. A closer description of this method can be found in Vitzthum et al [10]. .097 ε pre = 0.121 The onset of yielding is strongly dependent on a change in loading direction and the pre-forming level.…”

Section: Fig 2 Force-displacement Curves Of the Initial Materials And...mentioning

confidence: 99%

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Investigation of the influence of loading direction after pre-forming on the formability and mechanical properties of DP600

Norz

2023

Materials Research Proceedings

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Abstract. The material behaviour after non-proportional strain paths is subject of numerous current investigations. These investigations show that in addition to the stress state, a change in the direction of loading also has a significant influence on the material behaviour. In this work, the influence of non-proportional strain paths on the mechanical properties such as tensile strength, uniform strain, elongation at fracture and yield strength as well as the influence on formability is determined. For this purpose, a dual-phase steel CR330Y590-DP, with a thickness of 0.8 mm, is investigated in more detail. The material is pre-strained to different strain values and then further examined with Nakajima and tensile tests. The influence of the loading direction is determined by five different post-strain directions (0°, 22,5°, 45°, 67.5°and 90°) to the initial pre-strain direction. In addition to the method according to the standard, the yield strength is determined by a temperature-dependent determination method, which is based on the thermoelastic effect. This method has already been qualified for simple uniaxial tensile tests and a relation to the microstructural behaviour was proven. Thus, it provides valuable conclusions on the microstructural behavior for the tests performed within this study with a change in the loading direction.

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“…However, the continuous tensile test could be possible without any measurement stops using high-energy synchrotron radiations. [70][71][72] During in situ measurements with synchrotron radiations impinging on the sample, tensile tests need not be interrupted during each measurement at different strains for the same beam position on the sample and will be discussed later in this study. An illustration of this possibility is shown in Figure 2c.…”

Section: Techniques For the Quantification Of Austenitementioning

confidence: 99%

A Review on Measurement Techniques of Deformation‐Induced Transformation Kinetics in Transformation‐Induced Plasticity and Transformation‐Induced Plasticity‐Assisted Steels

Tiwari,

Varshney

2023

steel research int.

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Deformation‐induced austenite to martensite transformation is an important phenomenon that controls the flow behaviour of Transformation Induced Plasticity (TRIP) and TRIP‐assisted steels. Transformation kinetics and triggering strain are important parameters that need to be known during the transformation. Both these parameters can be correctly determined by an accurate quantitative assessment of the austenite during deformation. Various techniques have been employed for the quantitative assessment of the austenite by previous investigators. In this paper, both the in‐situ and ex‐situ measurement techniques used for quantitative assessment of austenite during/after tensile deformation of the TRIP and TRIP‐assisted steels are reviewed. A comparison of various techniques such as X‐ray diffraction, neutron diffraction, Mossbauer spectroscopy, and DC/AC magnetic permeability is presented. Due to the limited penetration power of the radiations, difficult access, and difficulty in setting up the measurement facility for the in‐situ measurements, X‐ray diffraction, neutron diffraction, and Mossbauer spectroscopy techniques do not yield accurate quantitative results and are time consuming. It is envisaged that an accurate quantitative assessment of austenite from the bulk of the TRIP and TRIP‐assisted steel specimens is possible with magnetic permeability measurement techniques. Real‐time quantitative assessments can be made by measuring changes in the magnetic permeability due to changes in the ferromagnetic content during deformation. Extensive calibration is required for the accurate measurement of the phases with the magnetic permeability measurements during the deformation of the steel.This article is protected by copyright. All rights reserved.

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In-situ analysis of the thermoelastic effect and its relation to the onset of yielding of low carbon steel

Cited by 7 publications

References 58 publications

A nonlinear lifetime prediction method for un‐ and low alloyed steels by damage determination based on non‐destructive measurement techniques

A nonlinear lifetime prediction method for un‐ and low alloyed steels by damage determination based on non‐destructive measurement techniques

Investigation of the influence of loading direction after pre-forming on the formability and mechanical properties of DP600

A Review on Measurement Techniques of Deformation‐Induced Transformation Kinetics in Transformation‐Induced Plasticity and Transformation‐Induced Plasticity‐Assisted Steels

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