Physical and mathematical modelling of extrusion processes

Arentoft, Mogens; Gronostajski, Z.; Niechajowicz, A.; Wanheim, Tarras

doi:10.1016/s0924-0136(00)00629-4

Cited by 23 publications

(10 citation statements)

References 4 publications

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“…On the basis of the obtained calculation results it was stated that plasticine is the best described by functions (5) and (6). White plasticine is the most precisely described by equation number (5), for which aim function is equal (7), for which Φσ = 0.04483%.…”

Section: Resultsmentioning

confidence: 92%

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Plastometric tests for plasticine as physical modelling material

2016

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This paper presents results of plastometric tests for plasticine, used as material for physical modelling of metal forming processes. The test was conducted by means of compressing by flat dies of cylindrical billets at various temperatures. The aim of the conducted research was comparison of yield stresses and course of material flow curves. Tests were made for plasticine in black and white colour. On the basis of the obtained experimental results, the influence of forming parameters change on flow curves course was determined. Sensitivity of yield stresses change in function of material deformation, caused by forging temperature change within the scope of 0 ∘ C ÷ 20 ∘ C and differentiation of strain rate forε = 0.563;ε = 0.0563;ε = 0.0056s −1 , was evaluated. Experimental curves obtained in compression test were described by constitutive equations. On the basis of the obtained results the function which most favourably describes flow curves was chosen.

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Section: Resultsmentioning

confidence: 92%

“…Lead is regarded as one of the soften metal, yet plasticine is mixture of clays, silts, oils and colour agents and wax [6]. These materials were used in experiments many times in such metal forming processes as: forging, extrusion, rolling [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Plastometric tests for plasticine as physical modelling material

2016

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“…The contact area with the die, on the other hand, was described by Coulomb friction. The friction coefficient is estimated in literature varying between 0.1 and 1 for different metallic materials [6,7]. In this study, it was assumed as 0.5.…”

Section: Indirect Extrusionmentioning

confidence: 99%

Modelling of Thermo-Mechanical Behaviour of Magnesium Alloys during Indirect Extrusion

Ertürk

Steglich

Bohlen³

et al. 2009

KEM

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A yield function for hexagonal closed packed (hcp) metals was modified with respect to strain rate and temperature and developed to capture the material behaviour during extrusion. Magnesium alloy ZEK100 was extruded indirectly at 300°C into a round bar. Compression tests were carried out at various strain rates, temperatures and sample orientation to characterise the material flow. These data were used as input data for fully thermo-mechanical coupled simulations of indirect extrusion. A successful prediction of the extrusion force and the temperature increase during extrusion is presented.

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“…ALE is not able to describe the steady-state characteristics of shortening billet and lengthening extrudate. Due to these restrictions in recent work, mostly FEM-analysis with an (updated) Lagrangian formulation is used to simulate the material flow through the whole extrusion process [15][16][17][18][19].…”

Section: Simulation Of the Materials Flow During Direct Extrusionmentioning

confidence: 99%