Examining the unloading behavior of dual-phase steels by means of microstructure simulations

Robl, Tobias; Krempaszky, Christian; Fillafer, A.; Werner, Ewald

doi:10.1016/j.msea.2021.141744

Cited by 6 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As Fillafer et al [56][57][58][59] demonstrated, the mechanical material behavior is not necessarily influenced solely by the amount of the constituting phases and the phase specific material parameters for the pure phases. The arrangement of these phases to each other on grain level, viz.…”

Section: Mechanical Problemmentioning

confidence: 99%

An Approach to Predict Geometrically and Thermo-Mechanically Induced Stress Concentrations in Ribbed Reinforcing Bars

Robl

Wölfle

Hameed

et al. 2022

Metals

Self Cite

View full text Add to dashboard Cite

Ribbed reinforcing steel bars (rebars) are used for the reinforcement of concrete structures. In service, they are subjected to cyclic loading. Several studies addressing the relationship between rib geometry, stresses at the rebar surface induced by service loads and the rebar fatigue performance can be found in literature. However, the rebar’s fatigue performance is also influenced by residual stresses originating from the manufacturing process. In this contribution, a modeling approach is proposed to examine geometrically and thermo-mechanically induced stress concentrations in ribbed reinforcing bars made of the steel grade B500B. A linear-elastic load stress analysis and a thermo-mechanical analysis of the manufacturing process are conducted. The results are discussed and compared to literature results. In case of the load stress analysis, the results agree well with findings reported in literature and extend the current state of knowledge for B500B rebars with small diameters. In case of the thermo-mechanical analysis, compressive residual stresses at the rebar surface between two ribs and tensile residual stresses in the longitudinal direction at the tip of the ribs can be reported.

show abstract

Section: Mechanical Problemmentioning

confidence: 99%

An Approach to Predict Geometrically and Thermo-Mechanically Induced Stress Concentrations in Ribbed Reinforcing Bars

Robl

Wölfle

Hameed

et al. 2022

Metals

Self Cite

View full text Add to dashboard Cite

show abstract

“…To model the effect of the anisotropic flow behavior of the grains in the ductile phase, the above-described crystal elastic-plastic constitutive law is employed. Compared to modeling isotropic phases (as done by, for example, [17,18]), additional contributions to the stress and strain fluctuations due to crystallographic misorientation can be depicted. This is potentially important for assessing the potential risk of micro-damage.…”

Section: Representative Volume Element Of the Microstructure In A Bra...mentioning

confidence: 99%

Multiscale modeling of the mechanical behavior of brazed Ni-based superalloy sheet metals

Huber

Vogler

Werner

2022

Continuum Mech. Thermodyn.

Self Cite

View full text Add to dashboard Cite

The elastic–plastic behavior of brazed Ni-based superalloys used in abradable turbomachinery sealing systems is analyzed by means of numerical simulations. A sequential multiscale modeling approach is employed to analyze the relevant effects on the mechanical behavior of a layered composite consisting of the braze metal and the joining partners. The focus of the investigations lies on the role of the multiphase microstructure within the brazing layer and the significance of microscopic parameters such as, for example, the volume fraction of the phases compared to macroscopic parameters (e.g., the brazing layer thickness). A representative volume element is employed on the microscale, and a layered composite is modeled on the macroscale to capture all relevant effects on both length scales during mechanical loading of the layered material composite. Virtual tensile tests at different temperatures and strain rates are chosen as a controlled testing environment that captures the characteristic loading conditions during a rubbing event in a turbomachinery. The parameter on the microscale with the highest influence on the mechanical behavior is the volume ratio of the brittle and ductile phases. It also has a significant effect on the macroscopic mechanical behavior. To reduce the risk of damage, it is advised to minimize the fraction of brittle phases in the brazing layer. According to the simulation results, this can be even more effective than reducing the overall thickness of the brazing layer. Additionally, an improvement of an existing analytical model for the estimation of the flow stress in the ductile phase of a dual-phase microstructure is proposed. By increasing the order of the root function in the analytic model, the effect of stress distribution between brittle and ductile phases can be incorporated in an empirical manner. This reduces the deviation between the analytical and the numerical approaches significantly.

show abstract

“…Dual phase steels, (DP), are a new generation of highstrength steel families, which were developed in the late 1970s, and are characterised by microstructure consisting of ferrite and martensite phases. [1][2][3][4][5][6] Since these materials can meet criteria such as strength and formability, they are particularly preferred in the automotive industry. [7][8][9] There are two types of DP steels that can be produced in general: hot rolling dual phase steels (HRDP), and cold rolling dual phase steels (CRDP).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Behaviour of Dual Phase Steels under Different Strain Rates

Topilla

Toros

2023

Kemija U Industriji

View full text Add to dashboard Cite

The objective of this research was to analyse the stress and strain behaviours of the triaxiality specimens (specimens of different shaping) of dual-phase steels, respectively DP600 and DP800, whose microstructures mainly comprise ferrite and martensite phases. These steels find wide application in the automotive industry, which is constantly searching for better quality materials in the aim of increasing vehicle safety, protecting the environment, and reducing fuel consumption. In this case, for all tested specimens the experimental uniaxial tensile tests were performed at three different strain rates, 0.0083 s −1 , 0.042 s −1 , and 0.16 s −1 , to determine mechanical properties such as stress, strain, yield strength, and ultimate tensile strength of mentioned steels. In addition, uniaxial tensile tests with characteristics similar to those experimental were carried out through the finite element modelling method using the Mat_Picewise_Linear_Plasticity_024 model, to determine the mentioned mechanical properties, but also to determine the failure parameters or plastic strain up to failure, of all triaxiality modelled specimens. The obtained results were validated by comparing the experimental results with numerical simulation results. The comparative scale of accuracy between both steels was made at the fracture strain, and the average accuracy of both steels for the standard (s) specimens was < 1 %, for the (20a) specimens 1.50 %, for the (4a) specimens 4 %, and for (a) specimens 3.50 %. Finally, it was concluded that the proposed material model and calibrated failure data fitted very well.

show abstract

Examining the unloading behavior of dual-phase steels by means of microstructure simulations

Cited by 6 publications

References 23 publications

An Approach to Predict Geometrically and Thermo-Mechanically Induced Stress Concentrations in Ribbed Reinforcing Bars

An Approach to Predict Geometrically and Thermo-Mechanically Induced Stress Concentrations in Ribbed Reinforcing Bars

Multiscale modeling of the mechanical behavior of brazed Ni-based superalloy sheet metals

Mechanical Behaviour of Dual Phase Steels under Different Strain Rates

Contact Info

Product

Resources

About