Determination of ductile fracture criteria for bulk and PM materials

KVACKAJ, T.; TIŽA, J.; KOVÁČOVÁ, A.; KOČIŠKO, R.; BACSÓ, J.

doi:10.4149/km_2014_5_249

Cited by 2 publications

(2 citation statements)

References 23 publications

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“…If the material Alumix 321 is exposed during plastic deformations to such stress–strain conditions when the damage factor is greater than 0.12, it will fail. The correctness of the measurement is also supported by the literature [ 48 ], where the same value

was measured using the upsetting test method, which was also verified by FEM simulation.…”

Section: Resultssupporting

confidence: 71%

Evaluation of Powder Metallurgy Workpiece Prepared by Equal Channel Angular Rolling

et al. 2023

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The aim of the article is to examine the workability of sintered powder material of aluminum alloy (Alumix 321) through severe plastic deformations under the conditions of the equal channel angular rolling (ECAR) process. Accordingly, the stress–strain analysis of the ECAR was carried out through a computer simulation using the finite element method (FEM) by Deform 3D software. Additionally, the formability of the ALUMIX 321 was investigated using the diametrical compression (DC) test, which was measured and analyzed by digital image correlation and finite element simulation. The relationship between failure mode and stress state in the ECAR process and the DC test was quantified using stress triaxiality and Lode angle parameter. It is concluded that the sintered powder material during the ECAR processing failure by a shearing fracture because in the fracture location the stress conditions were close to the pure shear (η and θ¯ ≈ 0). Moreover, the DC test revealed the potential role as the method of calibration of the fracture locus for stress conditions between the pure shear and the axial symmetry compression.

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was measured using the upsetting test method, which was also verified by FEM simulation.…”

Section: Resultssupporting

confidence: 71%

Evaluation of Powder Metallurgy Workpiece Prepared by Equal Channel Angular Rolling

et al. 2023

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“…Unfortunately, so far, no exact data concerning the method of determining the limit value of the damage criterion in the complex state of strain (among others for the processes of rotary forming) can be found. The information presented in the specialist literature mostly concerns simple cases of deformation (stretching and compression) [24,25,26,27]. Nevertheless, the criterion chosen can be used for reference purposes, allowing the estimation of the risk of the material cracking during the rolling process.…”

Section: Numerical Modelling Of the Helical Rolling Process For Prmentioning

confidence: 99%

The Effect of Process Parameters in Helical Rolling of Balls on the Quality of Products and the Forming Process

2018

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This paper presents selected numerical and experimental results of a skew rolling process for producing balls using helical tools. The study investigates the effect of the billet’s initial temperature on the quality of produced balls and the rolling process itself. In addition, the effect of billet diameter on the quality of produced balls is investigated. Experimental tests were performed using a helical rolling mill available at the Lublin University of Technology. The experiments consisted of rolling 40 mm diameter balls with the use of two helical tools. To determine optimal rolling parameters ensuring the highest quality of produced balls, numerical modelling was performed using the finite element method in the Forge software. The numerical analysis involved the determination of metal flow kinematics, temperature and damage criterion distributions, as well as the measurement of variations in the force parameters. The results demonstrate that the highest quality balls are produced from billet preheated to approximately 1000 °C.

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Determination of ductile fracture criteria for bulk and PM materials

Cited by 2 publications

References 23 publications

Evaluation of Powder Metallurgy Workpiece Prepared by Equal Channel Angular Rolling

Evaluation of Powder Metallurgy Workpiece Prepared by Equal Channel Angular Rolling

The Effect of Process Parameters in Helical Rolling of Balls on the Quality of Products and the Forming Process

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