Simulation of micromechanical damage to obtain mechanical properties of bimodal Al using XFEM

Hosseini‐Toudeshky, Hossein; Jamalian, Maryam

doi:10.1016/j.mechmat.2015.06.015

Cited by 18 publications

(8 citation statements)

References 34 publications

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“…Different modeling techniques have been used to model crack initiation and propagation. The predominant method used over the past decade is the extended Finite Element Method (XFEM) due to its advantage of crack path independence [24,25]. The most common way to validate the simulation predication is the capability to reproduce the macroscopic experimental stress-strain [26,27].…”

Section: Introductionmentioning

confidence: 99%

Strain localization and crack formation effects on stress-strain response of ductile iron

Kasvayee

Ghassemali

Salomonsson

et al. 2017

Materials Science and Engineering: A

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The strain localization and crack formation in ferritic-pearlitic ductile iron under tension was investigated by in-situ tensile tests. In-situ tensile tests under optical microscope were performed and the onset of the early ferrite-graphite decohesions and micro-cracks inside the matrix were studied. The results revealed that early ferrite-graphite decohesion and micro-cracks inside the ferrite were formed at the stress range of 280-330 MPa, where a kink occurred in the stress-strain response, suggesting the dissipation of energy in both plastic deformation and crack initiation. Some microcracks initiated and propagated inside the ferrite but were arrested within the ferrite zone before propagating in the pearlite. Digital Image Correlation (DIC) was used to measure local strains in the deformed micrographs obtained from the in-situ tensile test. Higher strain localization in the microstructure was measured for the areas in which the early ferrite-graphite decohesions occurred or the micro-cracks initiated.

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Section: Introductionmentioning

confidence: 99%

Strain localization and crack formation effects on stress-strain response of ductile iron

Kasvayee

Ghassemali

Salomonsson

et al. 2017

Materials Science and Engineering: A

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“…Schiavone et al [7] used both Gurson model and XFEM to capture fracture behavior in Aluminium specimens with different notched shapes and observed that the crack shapes were predicted correctly using two approaches, with the exception of the square-notch case using XFEM. 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.…”

Section: Possible Approaches To Simulate Fracture Of Steel Under Uniamentioning

confidence: 87%

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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“…In the work of Muhond et al [8], some trace elements (S, B, Se) were observed to stabilise the flake or nodular growth morphology of graphite, while F, O, N, P failed to do so. In general, there are two main approaches used for modelling the mechanical behaviour of CGI: representative volume element (RVE) and unit cell [9][10][11][12]. To the best of the author's knowledge, these two approaches are widely used in the field of computational mechanics to simulate the fracture behaviours of heterogeneous materials.…”

Section: Introductionmentioning

confidence: 99%

“…In the last decades, four main methods were used to simulate the fracture behaviours of materials [9,10,15,[22][23][24]: (i) the cohesive-zone model (CZM); (ii) the extended finiteelement method (XFEM); (iii) the Johnson-Cook (JC) damage model; and (IV) phase-field modelling. XFEM is a mesh-free method that can be used to simulate crack initiation and propagation in static, quasi-static, and dynamic problems.…”

Section: Introductionmentioning

confidence: 99%

Microstructure-Based CZE Model for Crack Initiation and Growth in CGI: Effects of Graphite-Particle Morphology and Spacing

Luo,

Baxevanakis,

Silberschmidt

2024

Solids

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Compacted graphite iron (CGI) is an engineering material with the potential to fill the application gap between flake- and spheroidal-graphite irons thanks to its unique microstructure and competitive price. Despite its wide use and considerable past research, its complex microstructure often leads researchers to focus on models based on representative volume elements with multiple particles, frequently overlooking the impact of individual particle shapes and interactions between the neighbouring particles on crack initiation and propagation. This study focuses on the effects of graphite morphology and spacing between inclusions on the mechanical and fracture behaviours of CGI at the microscale. In this work, 2D cohesive-zone-element-based models with different graphite morphologies and spacings were developed to investigate the mechanical behaviour as well as crack initiation and propagation. ImageJ and scanning electron microscopy were used to characterise and analyse the microstructure of CGI. In simulations, both graphite particles and metallic matrix were assumed isotropic and ductile. Cohesive zone elements (CZEs) were employed in the whole domain studied. It was found that graphite morphology had a negligible effect on interface debonding but nodular inclusions can notably enhance the stiffness of the material and effectively impede the propagation of cracks within the matrix. Besides, a small distance between graphite particles accelerates the crack growth. These results can be used to design and manufacture better metal-matrix composites.

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Simulation of micromechanical damage to obtain mechanical properties of bimodal Al using XFEM

Cited by 18 publications

References 34 publications

Strain localization and crack formation effects on stress-strain response of ductile iron

Strain localization and crack formation effects on stress-strain response of ductile iron

Fracture simulation of structural steel at elevated temperature using XFEM technique

Microstructure-Based CZE Model for Crack Initiation and Growth in CGI: Effects of Graphite-Particle Morphology and Spacing

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