Journal ArticleDOI
On the Bauschinger effect in dual phase steel at high levels of strain
TLDR
In this paper, the effect of volume fraction and hardness of martensite on the Bauschinger effect in dual phase (DP) steel was investigated for strain levels close to those observed in automotive stamping.Abstract:
The effect of volume fraction and hardness of martensite on the Bauschinger effect in Dual Phase (DP) steel was investigated for strain levels close to those observed in automotive stamping. Five different grades of DP steel were produced by controlled heat treatment allowing the examination of the Bauschinger effect for three different volume fractions of martensite and three levels of martensite hardness. Compression–tension and shear reversal tests were performed to examine the Bauschinger effect at high levels of forming strain. Good correlation between the shear reversal and the compression–tension test was observed suggesting that for DP steel, shear stress strain data, converted to equivalent stress–strain, may be applied directly to characterize kinematic hardening behavior for numerical simulations. Permanent softening was observed following strain reversal and increased with martensite volume fraction and pre-strain level. While the Bauschinger ratio saturates at 3% pre-strain, the Bauschinger strain increases linearly with forming strain without showing saturation. This suggests that to model material behavior accurately in forming processes involving complex loading paths and high levels of strain, test data generated at high strain is required.read more
Citations
More filters
Journal ArticleDOI
Mechanical, microstructural behaviour and modelling of dual phase steels under complex deformation paths
Juan Liao,José Tavares de Sousa,Augusto B. Lopes,Xin Xue,Frédéric Barlat,Frédéric Barlat,António B. Pereira +6 more
TL;DR: In this paper, the authors identify the mechanisms associated to the transient hardening behavior of dual phase steels under strain path changes, and to capture the observed material behaviours with appropriate constitutive models.
Journal ArticleDOI
Applying a new constitutive model to analyse the springback behaviour of titanium in bending and roll forming
TL;DR: In this paper, a strain path dependent constitutive model was proposed to describe the inelastic behavior of Ti-6Al-4V at room temperature based on the homogenous yield function combined with the anisotropic hardening characteristics, the so-called HAH model.
Journal ArticleDOI
A crystal plasticity model for describing the anisotropic hardening behavior of steel sheets during strain-path changes
TL;DR: In this paper, a viscoplastic self-consistent crystal plasticity model (VPSC-RGBV), which accounts for various microstructural features, including the accumulation and annihilation of dislocations due to slip activity and latent hardening originated from interactions between gliding dislocation on different slip planes, is described.
Journal ArticleDOI
Mechanical response of stainless steel subjected to biaxial load path changes:Cruciform experiments and multi-scale modeling
M. V. Upadhyay,Anirban Patra,Wei Wen,Tobias Panzner,Steven Van Petegem,Carlos N. Tomé,Ricardo A. Lebensohn,Helena Van Swygenhoven,Helena Van Swygenhoven +8 more
TL;DR: In this article, a multi-scale modeling approach is proposed to simulate the microstructural and mechanical behavior of metal/alloy parts with complex geometries subjected to multi-axial load path changes.
A dislocation-based hardening model incorporated into an anisotropic hardening approach
TL;DR: In this article, a simple dislocation density-based model coupled with the homogeneous yield function anisotropic hardening (HAH) approach was used to predict the springback of a realistic part after forming in order to prove its accuracy, robustness and efficiency.
References
More filters
Journal ArticleDOI
Advanced high strength steels for automotive industry
TL;DR: In this article, the basic concepts of advanced high strength steels (AHSS) for use in the automobile industry, including chemical composition design, microstructure and mechanical properties development during thermomechanical processing, production technology characterisation, potential applications and performance in service, are presented.
Journal ArticleDOI
Simple shear tests: Experimental techniques and characterization of the plastic anisotropy of rolled sheets at large strains
TL;DR: In this paper, a detailed analysis of simple shear experiments on rolled metal sheets is undertaken, in view of their optimization, and the shear strain and stress heterogeneities eventually due to the free ends effect are investigated, as well as the best way to prevent premature failure by choosing an adequate shape and clamping of the specimen.
Journal ArticleDOI
Towards an accurate description of the anisotropic behaviour of sheet metals under large plastic deformations: Modelling, numerical analysis and identification
TL;DR: In this article, a microstructural model was developed by Teodosiu and Hu (1995) that accurately describes the macroscopic anisotropic behavior such as the Bauschinger effect, the work-hardening stagnation and the worksoftening of polycrystalline metals.
Journal ArticleDOI
Influence of martensite morphology on the work-hardening behavior of high strength ferrite–martensite dual-phase steel
TL;DR: In this article, the work-hardening behavior of high-strength ferrite-martensite dual-phase steel was investigated by using a modified Crussard-Jaoul technique.
Journal ArticleDOI
The effect of ferrite grain size and martensite volume fraction on the tensile properties of dual phase steel
Chang Peng-Heng,A.G. Preban +1 more
TL;DR: In this paper, a Hall-Petch type dependence on the mean free path in ferrite d = σ 0 + kd − 12 was found for the yield strength and tensile strength of dual phase steels.