A micromechanical damage simulation of dual phase steels using XFEM

Vajragupta, Napat; Uthaisangsuk, Vitoon; Schmaling, B.; Münstermann, Sebastian; Hartmaier, Alexander; Bleck, Wolfgang

doi:10.1016/j.commatsci.2011.10.035

Cited by 130 publications

(84 citation statements)

References 32 publications

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“…Hosseini-Toudeshky and Jamalian [8] performed fracture modeling for bulk Aluminium Al5083 using XFEM and predicted the ductile fracture behavior of Al5083 very well by demonstrating the comparison of stress-strain behavior results between simulations and tests. Vajragupta et al [9] employed XFEM technique to capture fracture behavior of dual phases steel (DP steel), where both ductile fracture and brittle fracture were observed, and demonstrated the capability of XFEM for predicting both ductile and brittle fracture in the same specimen. Ramazani et al [10] investigated the fracture behavior of DP600 steel with various chemical contents and demonstrated that XFEM captured fracture behavior of different types of DP600 steel quite well.…”

Section: Possible Approaches To Simulate Fracture Of Steel Under Uniamentioning

confidence: 99%

Fracture simulation of structural steel at elevated temperature using XFEM technique

Cai

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Modeling fracture is important for predicting the actual behavior of structural steel in fire, where fracture of steel members is often the failure mode that affects the overall strength and deformation capacity of steel members. Therefore, in this paper, recent research on modeling steel fracture at elevated temperature is presented. Extended Finite Element (XFEM) together with fracture criterion of principle logarithmic strain is used to simulate the fracture behavior of three different types of tensile test specimens named MA, MB and MC made from American structural steel ASTM A992 at elevated temperature up to 1000°C.The simulation results are then compared with test results to validate the accuracy of simulations. In addition, study is conducted to evaluate how sensitive the predicted engineering stress-strain curves and fracture initiation point on the curves to the selected value of principle logarithmic strain at fracture. Finally, the generalized principle logarithmic strains at each temperature case are proposed for fracture simulation of ASTM A992 steel specimens. IntroductionFracture behavior of steel at elevated temperature is of great interest because it can significantly influence the response of steel structure in fire. One example of collapse of steel building mainly due to connection fracture is WTC building collapse in US in fire event after severe attacks. It was also observed that steel fracture in tension was a common failure mode during heating or cooling stage in fire events. However, to accurately predict fracture behavior of steel in fire is still difficult due to lack of enough test data and studies. Therefore, in order to propose an approach to predict fracture behavior of steel in fires with reasonable accuracy, standard steel specimens under unaxial tension at room temperature and elevated temperature up to 1000°C with 100°C intervals are investigated and simulated using advanced computational method such as finite element method. The obtained engineering stress-strain curves and failure mechanism of structural steel are compared with several tests data to verify the proposed approach.

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Section: Possible Approaches To Simulate Fracture Of Steel Under Uniamentioning

confidence: 99%

Fracture simulation of structural steel at elevated temperature using XFEM technique

Cai

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Some of the available damage models such as the ones of the aforementioned failure mechanisms, the Gurson-Tvergaard-Needleman (GTN) damage model, the extended finite-element model (XFEM), the cohesive-zone model and so on, were closely estimated for the experiments. [20][21][22][23] A. Ramazani et al investigated the effect of an inhomogeneous morphology on the mechanical properties of a welded joint. 15 2D RVEs simulated flow curves were corrected to 3D ones, taking into account the effects of the microstructure, the chemical composition and the area fraction on the macroscopic mechanical properties of the welded joint.…”

Section: Introductionmentioning

confidence: 99%

Phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications

Zhao¹,

Zhao²,

Sun³

et al. 2017

Mater. Tehnol.

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In this work, the phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications were investigated theoretically and experimentally. In particular, the micromechanical behavior of the steel was modeled, based on the effects of the microstructure, phase fractions, local compositions of single phases and their area shapes. The developed model was used for predicting the damage behavior of a specimen. It was demonstrated that the tensile strength increased with the increasing temperature due to an increase in the amount of martensite in the steel, but the hardening behavior of this specimen was affected by the microstructure. Furthermore, the flow curves of the steel under different intercritical temperatures could be well predicted based on the real microstructures. The subsequent simulation results showed that while higher stress concentrated on the martensite, the shear-band appearance strongly depended on the microstructures of the phases. In addition, for the prediction of damage behaviors, the true stress/true strain curves of macroscale simulations showed good agreement with the experiments involving differently heat-treated steels. Keywords: intercritical treatment, steel, micro model V tem delu so teoreti~no in eksperimentalno preiskovali fazne spremembe in mikromehanske lastnosti dvofaznega jekla po kemijskih prilagoditvah. [e posebej je bilo modelirano mikromehansko obna{anje jekla glede na mikrostrukturo, dele`e posameznih faz, lokalno sestavo posameznih faz in njihovo morfologijo. Razviti model je bil uporabljen za napoved po{kodb vzorca. Dokazano je bilo, da se natezna trdnost pove~uje z nara{~ajo~o temperaturo zaradi nara{~anja vsebnosti martenzita v jeklu, vendar je na kaljivost tega vzorca vplivala mikrostruktura. Nadalje je bilo ugotovljeno, da je mo`no krivulje te~enja jekla pri razli~nih interkriti~nih temperaturah dobro napovedati na podlagi dejanskih mikrostruktur. Nadalje so rezultati simulacij pokazali, da so vi{je napetosti koncentrirane na martenzitu in isto~asna prisotnost stri`nih pasov, mo~no odvisne od mikrostruktur posameznih faz. Poleg tega je za napoved po{kodb pomembno, da se prave krivulje napetost-deformacija, dobljene s pomo~jo simulacij na makronivoju, dobro ujemajo z eksperimentalnimi, dobljenimi pri razli~no toplotno obdelanih jeklih.

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“…The results showed that the secondary fracture is cleavage, which hinted a brittle fracture. Feng [18] found the overall fracture mode of DP steel is determined by the competition between the brittle fracture of the martensite and ductile damage in the ferrite under multi-axial loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Fracture performance of high strength steels, aluminium and magnesium alloys during plastic deformation

Wang

2015

MATEC Web of Conferences

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Abstract.A series of uniaxial tension tests were performed for 5052 and 6061 aluminum alloys, AZ31B magnesium alloy, TRIP600 and DP600 steels, to obtain a better understanding of their fracture performance. Scanning electron microscope (SEM) observation of the microstructure evolution was conducted. The dimple structure, orientation relationship between the fracture surface and tensile direction, necking behavior were analyzed. The fracture mechanism and fracture mode of each material was discussed in detail. The results show that TRIP600 steel is subject to a typical inter-granular ductile fracture combined by shear fracture. DP600 steel belongs to mainly ductility mixed with normal fracture. Both 5052 and 6061 aluminum alloys are subject to a mixed ductility fracture and brittle fracture. AA5052 and AA6061 belong to a typical shear fracture and a normal fracture, respectively. Magnesium AZ31B is typical of a brittle fracture combined with normal fracture.

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A micromechanical damage simulation of dual phase steels using XFEM

Cited by 130 publications

References 32 publications

Fracture simulation of structural steel at elevated temperature using XFEM technique

Fracture simulation of structural steel at elevated temperature using XFEM technique

Phase-transformation behavior and micromechanical properties of a dual-phase steel after chemical modifications

Fracture performance of high strength steels, aluminium and magnesium alloys during plastic deformation

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