Uniform principle on stress, strain and yield locus for analysing metal forming processes: the contribution of Prof. Z.R. Wang

Hu, Weilong; Zhang, He; Fang, Yue

doi:10.1016/j.jmatprotec.2004.04.006

Cited by 11 publications

(8 citation statements)

References 4 publications

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“…On the macroscale the number of microcavities may be approximated by introducing a scalar parameter, say D, to quantify the material damage process. [7] In the past several different approaches were developed and applied to the analysis of ductile fracture. However, the connection between failure and deformation is complicated.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Effect of Multi-Axial Stress State on the Deformation Path in Tube Flaring Process By Necking Instability Criteria

Buchmayr

Omidvar

2021

Preprint

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Various parts for automotive, appliance and oil industry are pro- duced from tubes that are assembled and welded. For gaining the best weight savings, durability and cost reasons (energy saving, production cost, etc) the formability of the tubular materials is very important. The overall success of deformation process heavily depends on the incoming tubular material proper- ties. In this work, formability of tubular steels is experimentally characterized and with the development of a numerical model the effect of biaxial stress state has been investigated. An experimental method has been developed to characterize the importance of multi-axial stress state on the formability of tubes. This requires the deformation in form of flaring of the tubular samples through a conical die. Damage strains are determined with the help of Hill-Swift Sheet Metal Forming Criteria and a plot of main strains occurring during the tube flaring test, after variation of the die-angle and friction coefficient has been resulted. Experimental results were then entered into the damage models of finite element program DEFORMTM-PC PRO and used to calibrate the damage model for formability so that a sizable variation of range of multiaxial state of stress could be produced. The results showed that with increasing the stress multiaxiality of tubular steels, the damage strain was reduced. This indicates that the proposed method could be used of benefit in quality control in the production of tubes specially in the monitoring and controlling of tubes production such as tube rolling, welding and annealing.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Effect of Multi-Axial Stress State on the Deformation Path in Tube Flaring Process By Necking Instability Criteria

Buchmayr

Omidvar

2021

Preprint

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“…For example when À1 l < 0; it is tensile strain state, when l = 0, it is plane strain state and when 0 < l 1; it is compress strain state. That is, the type of strain state and the degree of complicacy can be determined by the LodeÕs parameter (Ref [13][14][15]. When through the analysis of the LodeÕs parameter, some measures can be taken to change the stress situation, and then change the plastic deformation condition to improve the forming property of the billet.…”

Section: Types Of Deformationmentioning

confidence: 99%

Research of Metal Flow Behavior during Extrusion with Active Friction

Shi

Liu

et al. 2007

J. of Materi Eng and Perform

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Using numerical simulation and experiment, the metal flow behavior mechanical mechanisms in the extrusion process with active friction were investigated. The characteristic variables, second invariant of the stress deviator J 2 and the LodeÕs coefficient l were employed to partition the deformation region. It is shown that no metal flow interface occurred at the container bottom in the extrusion with active friction and the dead zone disappeared completely. The strain types of the material in the plastic deformation area decreased from three types into a single type of tension, and the homogeneity of metal deformation as well as metal flow was greatly improved. It was also indicted that the active friction was beneficial to the extrusion process and the promotion of product quality. After contrasting the result of experiment and the simulation, the displacement and the load were well correlated on both values and trends.

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“…As for the latter one, the relationship between order of total principle strain components and the associated principle stress components was deduced on the basis of Levy-Mises equation. This theory reveals the dramatic relationship between dimensional change of metal and the external forces added to the metal during deformation process and received its applications in qualitative and quantitative analysis [3,4].…”

Section: Introductionmentioning

confidence: 99%

A Consistent Relationship between the Stress and Plastic Strain Components and Its Application in Deep Drawing Process

Zhang

Qin

et al. 2017

Mathematical Problems in Engineering

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As von Mises yield criterion and associated flow rule (AFR) are widely applied in metal forming field, a semitotal deformation consistent relationship between the stress and plastic strain components and the rule of dimensional changes of metal forming processes in a plane-stress state are obtained on the basis of them in this paper. The deduced consistent relationship may be easily used in forming interval of the workpiece. And the rule of dimensional changes can be understood through three plastic strain incremental circles on which the critical points can be easily determined on the same basis. Analysis of stress and plastic strain evolution of aluminum warm deep drawing process is conducted, and the advantage of nonisothermal warm forming process is revealed, indicating that this method has the potential in practical large deformation applications.

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Uniform principle on stress, strain and yield locus for analysing metal forming processes: the contribution of Prof. Z.R. Wang

Cited by 11 publications

References 4 publications

Effect of Multi-Axial Stress State on the Deformation Path in Tube Flaring Process By Necking Instability Criteria

Effect of Multi-Axial Stress State on the Deformation Path in Tube Flaring Process By Necking Instability Criteria

Research of Metal Flow Behavior during Extrusion with Active Friction

A Consistent Relationship between the Stress and Plastic Strain Components and Its Application in Deep Drawing Process

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