Bauschinger Effect Response of Automotive Sheet Steels

Han, Kunpeng; Tyne, C. J. Van; Lévy, Bernard

doi:10.4271/2005-01-0084

Cited by 4 publications

(4 citation statements)

References 4 publications

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“…Point D is the reverse yield starting point which represents the compressive yield strength when the material starts to unload at point C. In Mroz model, it assumes that the elastic region is constant and represented by the initial yield stress. This is contradictory to what was observed in real material compression testing [10]. Thus when the material starts to unload at higher strength, lower compressive yield strength is obtained.…”

Section: Figure 2 Uniaxial Stress-strain Curves In Mroz Modelcontrasting

confidence: 86%

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An Anisotropic Hardening Model for Springback Prediction

Zeng¹,

Xia²

2005

AIP Conference Proceedings

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As more Advanced High-Strength Steels (AHSS) are heavily used for automotive body structures and closures panels, accurate springback prediction for these components becomes more challenging because of their rapid hardening characteristics and ability to sustain even higher stresses. In this paper, a modified Mroz hardening model is proposed to capture realistic Bauschinger effect at reverse loading, such as when material passes through die radii or drawbead during sheet metal forming process. This model accounts for material anisotropic yield surface and nonlinear isotropic/kinematic hardening behavior. Material tension/compression test data are used to accurately represent Bauschinger effect. The effectiveness of the model is demonstrated by comparison of numerical and experimental springback results for a DP600 straight U-channel test.

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Section: Figure 2 Uniaxial Stress-strain Curves In Mroz Modelcontrasting

confidence: 86%

“…[10] found that the amount of Bauschinger effect actually depends on the hardening magnitude before the loading is reversed. In fact there are no extra parameters needed to fit the model.…”

Section: Figure 1 Illustration Of Bauschinger Effectmentioning

confidence: 96%

An Anisotropic Hardening Model for Springback Prediction

Zeng¹,

Xia²

2005

AIP Conference Proceedings

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“…The sample was first strained to a forward strain to achieve a forward stress and then compressed until the point of buckling. The reverse yield stress is found using a 0.2% offset strain [58][59][60] and it is much smaller than , indicating a pronounced Bauschinger effect. The Bauschinger effect can be quantified by the back stress which is defined as = ( − | |)/2 [50,51,61].…”

Section: Bauschinger Effect Studied Using Tension-compression Testsmentioning

confidence: 90%

Strain hardening behaviour of as-quenched and tempered martensite

Wang

Sun

et al. 2020

Acta Materialia

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Martensite is a key constituent in advanced high strength steels and plays an important role in providing the high strength. While the strength of martensite has been extensively studied in the past, its low elastic limit and extremely high strain hardening rate remain a puzzle for the steel community. Composite models proposed recently can successfully reproduce these features as result of gradual yielding of microstructural constituents with either variations in intrinsic yield strengths or transformation induced residual stresses. Although these composite models can explain certain observations associated with the deformation of as-quenched martensite, neither can self-consistently describe all the key characteristics in the tension-compression behaviour of asquenched martensite. Attempts to extend these composite models to tempered martensite have been limited.In this contribution, we conduct a systematic experimental study on the strain hardening of as-quenched and tempered martensite with mechanical testing (e.g. monotonic tension and tension-compression) and interrupted X-ray diffraction. It is shown that the high strain hardening rate, large Bauschinger effect and diffraction line narrowing found in as-quenched martensite during straining can be sustained in tempered martensite tempered up to 400°C. These phenomena can be understood by considering martensite as a multi-constituent composite having both variations in intrinsic yield strengths and relaxation of transformation induced residual stresses during straining.

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“…The magnitude of depends on the choice of the reverse strain offset in determining [20][21][22]. In this work, we used an offset of 0.2% which is commonly found in the literature of steels [23][24][25][26]. For each tempering condition, several forward strains were chosen and the maximum forward strain was set approximately 0.5% to 1% below the uniform elongation.…”

mentioning

confidence: 99%

Thermal and athermal contributions to the flow stress of martensite

Wang

Sun

et al. 2020

Materialia

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Recent theories consider as-quenched martensite as a composite which strain hardens by the gradual yielding of constituents. An underlying hypothesis is that hardening comes primarily from athermal hardening contributions. In this contribution, we conducted strain-rate jump and tension-compression tests to quantify the athermal and kinematic hardening contributions in martensite. It is shown that athermal hardening accounts for ~75% of the total strength of as-quenched martensite. The magnitudes of athermal and kinematic hardening decrease as a function of tempering. A correlation between the athermal and kinematic hardening contributions is identified and shown to be independent of chemistry and tempering condition.

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Bauschinger Effect Response of Automotive Sheet Steels

Cited by 4 publications

References 4 publications

An Anisotropic Hardening Model for Springback Prediction

An Anisotropic Hardening Model for Springback Prediction

Strain hardening behaviour of as-quenched and tempered martensite

Thermal and athermal contributions to the flow stress of martensite

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