Dynamic behavior and constitutive modeling of magnesium alloys <font>AZ91D</font> and <font>AZ31B</font> under high strain rate compressive loading

Xiao, Jing; Ahmad, Irfan; Shu, Dong Wei

doi:10.1142/s0217984914500638

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…They observed that increasing the rotational speed above 1400 rpm caused void defect to form in the stir zone. Increase in grain size and in dislocation density in the stir zone was observed with increase in the rotational speed [7].…”

Section: Introductionmentioning

confidence: 84%

The Study the Influence of Overlapping on the Microstructure, Tensile, and Creep Strength after Performing FSP on AZ91 (Numerical and Experimental)

Amini¹,

Arab²,

Gollo³

et al. 2020

Preprint

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In this paper, the effect of multi-pass friction stir processing on the mechanical properties of AZ91 alloy has been studied. For the numerical investigation, this process has been simulated with the three-dimensional numerical modeling based on the ABAQUS/Explicit. This simulation involves the Johnson-Cook models for defining the material behavior during this intense plastic deformation and investigating the fracture criterion. The tool plunging and stirring phases in the two-pass process has been simulated. To prevent too much distortion of elements during modeling, the Arbitrary Lagrangian-Eulerian technique for automatically re-meshing of distorted elements has been used. The model was calibrated using the experimental results from the previous works. This model can predict the transient temperature distribution and residual stress field during FSP on AZ91. The results show that the maximum temperature in the advancing-side region is more than that in the retreating-side region. In addition, numerical results show that at the end position of the process, the tool during the lift-up leaves the keyhole region in the compressive stress state. The experimental results investigated the effect of multi-pass FSP on the microstructure, microhardness, tensile and creep properties of AZ91 magnesium alloy. The FSP is performed by applying 50% overlapping. The tensile, and creep tests are conducted at several temperatures from 25 to 210 °C. The optical microscopy and scanning electron micrograph (SEM) were used to study the microstructure of the samples after performing multi-pass friction stir processing. The experimental results indicate that on average, the tensile strength, microhardness, and creep strength of the processed samples increased by about 29, 23, and 38 %, respectively compared to the unprocessed ones.

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Section: Introductionmentioning

confidence: 84%

The Study the Influence of Overlapping on the Microstructure, Tensile, and Creep Strength after Performing FSP on AZ91 (Numerical and Experimental)

Amini¹,

Arab²,

Gollo³

et al. 2020

Preprint

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“…This is because it can accurately predict model parameters with minimal effort and is therefore incorporated into most of the available FE tools. The JC model is adequate to define the material behaviour during the FSW/FSP as a process with intense plastic deformation at a high strain rate because JC constants for every single material are established from the results of high strain rate tests [33]. The material behaviour for thermal simulation of FSW for AZ91 Mg alloy is modelled using the JC material model by Fashami et al [34] and Hoda et al [27] due to the robustness analysis of its parametric campaign.…”

Section: Finite Element Analysismentioning

confidence: 99%

Numerical and experimental investigation on AZ91 friction stir welding joints: Mechanics, properties

Desai

Khatri²,

Rana

et al. 2023

Materials Science and Technology

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The present endeavour is to evaluate numerically and experimentally the influence of friction stir welding (FSW) parameters on peak temperatures, microstructures and mechanical properties of AZ91 magnesium alloy joints. A full 3D finite element ABAQUS model was developed to simulate the temperature distribution along the joint line. Therefrom, a total of nine different parametric combinations were derived for experimentations. Important insights relating to the material flow patterns and grain morphologies observed while altering the processing parameters have been elaborated. The parametric influence on the peak temperatures, grain morphologies, intermittent phases, tensile strength, and hardness are discussed through several mechanisms. Remarkably, the specimens prepared with the highest tool rotation speeds exhibited superior properties owing to several strengthening mechanisms.

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Section: Introductionmentioning

confidence: 99%

“…The tensile properties of sheet metals at high or intermediate strain rate are important since the dynamic behavior of a material is different from its static behavior because of the strain rate effect. [1][2][3][4] During the sheet metal forming processes the thickness distribution and the flow stress of sheet metals change with the plastic strain and the residual stress. [5] Most experiments to obtain the tensile properties at intermediate strain rate have been thus far carried out by using specimens without considering the pre-strain from the forming process.…”

Section: Introductionmentioning

confidence: 99%

Tensile Properties of Sheet Metals at Intermediate Strain Rates with Pre-Strain

Kim

Huh

2015

steel research int.

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This paper investigates the tensile properties of sheet metals at intermediate strain rates in relation to the pre‐strain history induced by the fabrication process. Sheet metals such as SPCEN(DDQ), EZNCD(DQ), SPCC(CQ), SPRC340R, and SPRC440E were selected with the pre‐strain of 2, 5, and 10% by tensile elongation with static tensile test machine, which could be equivalent to the plastic strain induced by a sheet metal forming process. The pre‐strained specimens were elongated at the strain rate ranged from 1 to 100 s−1. The experimental results reveal that the stress‐strain curves are noticeably influenced by the pre‐strain at the intermediate strain rate for low yield stress steels such as SPCEN, EZNCD, SPCC, and SPRC340R. It is also noticed that the flow stress does not trace the given stress‐strain curve when a sheet metal is pre‐strained and the yield stress as well as the ultimate tensile strength increases. This behavior is against the old conjecture that the flow stress follows the stress‐strain curve even with the pre‐strain. This paper suggests a new flow stress model for pre‐strained sheet metals. The flow stress model consists of two terms: the first term is the ratio of the yield stress of a pre‐strained specimen to the equivalent flow stress obtained from the test without pre‐strain; the second term is the general empirical flow stress model without the pre‐strain effect.

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Dynamic behavior and constitutive modeling of magnesium alloys AZ91D and AZ31B under high strain rate compressive loading

Cited by 8 publications

References 9 publications

The Study the Influence of Overlapping on the Microstructure, Tensile, and Creep Strength after Performing FSP on AZ91 (Numerical and Experimental)

The Study the Influence of Overlapping on the Microstructure, Tensile, and Creep Strength after Performing FSP on AZ91 (Numerical and Experimental)

Numerical and experimental investigation on AZ91 friction stir welding joints: Mechanics, properties

Tensile Properties of Sheet Metals at Intermediate Strain Rates with Pre-Strain

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