Investigation of the morphology of internal defects in cross wedge rolling

Li, Qiang; Lovell, Michael R.; Slaughter, William S.; Tagavi, Kaveh A.

doi:10.1016/s0924-0136(02)00303-5

Cited by 99 publications

(70 citation statements)

References 7 publications

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“…Figure 18 further shows the stress triaxiality counters at the mid cross-section at various rolling times. As is seen in the figure, the crack propagates to the mid cross-section at 0.52 s and elongates in a direction normal to the maximum stress triaxiality at 0.68 and 0.8 s. The above-explained phenomenon of crack formation also quite well agrees with the experimentally observed crack formation in the knifing and guiding zones in cruciform shapes propagating through the direction of the maximum principal stress in CWR [8].…”

Section: Failuresupporting

confidence: 85%

Cross wedge rolling of a Ti6Al4V (ELI) alloy: the experimental studies and the finite element simulation of the deformation and failure

Çakırcalı

Kılıçaslan

Güden

et al. 2012

Int J Adv Manuf Technol

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The cross wedge rolling (CWR) deformation and fracture of a Ti6Al4Al (ELI) alloy were investigated experimentally and numerically using a coupled thermomechanical finite element model analysis. The experimentally determined flow stress and damage model parameters were verified by tension split Hopkinson pressure bar testing of notched samples. The simulation and experimental CWR forces showed well agreements except near the end of the stretching zone. The model analysis showed that the temperature distribution in the work piece was nonuniform during the CWR. When the initial temperature of the work piece was relatively low, the work piece temperature increased, a heating effect of the plastic deformation, while relatively high initial work piece temperatures resulted in cooling the work piece, caused by the work piece contact with the tools. The cracks were shown numerically to initiate in the midsections of the work piece during the guiding action and elongated in a direction normal to the maximum tensile stress triaxiality, resulting in cruciformshaped crack formation, which was well agreed with the previously observed crack shape.

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Section: Failuresupporting

confidence: 85%

Cross wedge rolling of a Ti6Al4V (ELI) alloy: the experimental studies and the finite element simulation of the deformation and failure

Çakırcalı

Kılıçaslan

Güden

et al. 2012

Int J Adv Manuf Technol

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“…This point was specifically chosen because it is known to be the location for void and crack initiation. It should also be mentioned that only the stress and strain in the knifing and guiding zones were considered because the void initiation is known to occur by the end of the guiding zone [16].…”

Section: The Finite Element Failure Stress Analysismentioning

confidence: 99%

“…Since strain is a measure of the intensity of deformation, it is logical that it will be a more accurate predictor of void initiation than stress. In addition, in a prior experimental work by the authors [16], a deformation coefficient was introduced to predict the likelihood of a void formation. The deformation coefficient is given by:…”

Section: The Finite Element Strain Analysismentioning

confidence: 99%

The establishment of a failure criterion in cross wedge rolling

Lovell

2004

Int J Adv Manuf Technol

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Internal defects in the cross wedge rolling (CWR) process can lead to the catastrophic failure of products. Using specialised experiments and the explicit dynamic finite element model (FEM), this work investigates the mechanisms of void generation and growth in the cross wedge rolling process. Based on a combined numerical and experimental approach, the morphology of void generation is determined as a function of the workpiece material and three primary parameters in the cross wedge rolling process: the forming angle, a, the stretching angle, b and the area reduction, D A . Through the definition of a non-dimensional deformation coefficient, _ , a method for predicting the likelihood of void formation is subsequently ascertained and discussed with respect to CWR tooling design and operating conditions.

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“…O defeito que apresenta maior ocorrência nesse processo é a formação de cavidades ou vazios no interior dos produtos como representado na Figura 1. Esse tipo de defeito também é conhecido como "efeito Mannesmann", tendo grande importância no processo já que pode se estender por toda a região da peça acarretando em perda de resistência do produto, podendo levar a sua ruptura [8,9].…”

Section: Introductionunclassified

Análise Numérica Da Influência De Defeitos Internos Na Falha De Produtos Obtidos Por Laminação Transversal Com Cunha

Judice¹,

Button²

2014

Proceedings of 10th World Congress on Computational Mechanics

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Resumo. O processo de conformação denominado Laminação Transversal com INTRODUÇÃOA Laminação Transversal com Cunha (LTC) é um processo de conformação que tem se destacado e está em constante desenvolvimento devido às suas vantagens [16]. Esse processo é caracterizado pela deformação plástica de uma barra devido a ação de ferramentas em formato de cunha que se movem tangencialmente uma em relação à outra [11].O processo LTC apresenta três principais grupos característicos de defeitos que são a formação de cavidades e poros, defeitos de superfície e seções com geometria diferente da esperada. O defeito que apresenta maior ocorrência nesse processo é a formação de cavidades

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Investigation of the morphology of internal defects in cross wedge rolling

Cited by 99 publications

References 7 publications

Cross wedge rolling of a Ti6Al4V (ELI) alloy: the experimental studies and the finite element simulation of the deformation and failure

Cross wedge rolling of a Ti6Al4V (ELI) alloy: the experimental studies and the finite element simulation of the deformation and failure

The establishment of a failure criterion in cross wedge rolling

Análise Numérica Da Influência De Defeitos Internos Na Falha De Produtos Obtidos Por Laminação Transversal Com Cunha

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