Effect of strain rate on the forming behaviour of sheet metals

Verleysen, Patricia; Peirs, Jan; Slycken, Joost Van; Faes, Koen; Duchêne, Laurent

doi:10.1016/j.jmatprotec.2011.03.018

Cited by 99 publications

(41 citation statements)

References 21 publications

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“…Furthermore,ε 0 represents the strain rate for the quasi-static reference loadingε 0 = 5.6 × 10 −4 s −1 [26]. However, in this work, using the proposed strain rate by Verleysen et al [26], we observed that there were no sharp corners at the bottom of the deformed cup; the final diameter of the cup did not match with the experimental value; and also, the formability for different loading profiles was not similar to that of the experiments. All the above-mentioned numerical issues were due to the highly dynamic process.…”

Section: Numerical Modelingmentioning

confidence: 99%

Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process

Patil

Prajapati

Jenkouk

et al. 2017

Metals

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Abstract:Gas detonation forming is a high-speed forming method, which has the potential to form complex geometries, including sharp angles and undercuts, in a very short process time. Despite many efforts being made to develop detonation forming, many important aspects remain unclear and have not been studied experimentally, nor numerically in detail, e.g., the ability to produce sharp corners, the effect of peak load on deformation and damage location and its propagation in the workpiece. In the present work, DC04 steel cups were formed using gas detonation forming, and finite element method (FEM) simulations of the cup forming process were performed. The simulations on 3D computational models were carried out with explicit dynamic analysis using the Johnson-Cook material model. The results obtained in the simulations were in good agreement with the experimental observations, e.g., deformed shape and thickness distribution. Moreover, the proposed computational model was capable of predicting the damage initiation and evolution correctly, which was mainly due to the high-pressure magnitude or an initial offset of the workpiece in the experiments.

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Section: Numerical Modelingmentioning

confidence: 99%

Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process

Patil

Prajapati

Jenkouk

et al. 2017

Metals

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“…Different industrial sectors such as the automotive (Rusinek et al, 2008;Kazanci and Bathe, 2012), aeronautical (Karagiozova and Mines, 2007;Varas et al, 2009), naval (Wang et al, 2008;Ehlers, 2010) or manufacturing (Miguélez et al, 2009;Verleysen et al, 2011) require quick and accurate modeling of systems to optimize design parameters, accounting for impact loads. The rapid progress in computational mechanics permits to simulate solids and structures undergoing high strain rates.…”

Section: Introductionmentioning

confidence: 99%

Dynamic tensile necking: Influence of specimen geometry and boundary conditions

Osovski

Rittel

Rodríguez-Martínez

et al. 2013

Mechanics of Materials

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a b s t r a c tThis paper examines the effects of sample size and boundary conditions on the necking inception and development in dynamically stretched steel specimens. For that task, a coordinated systematic experimental-numerical work on the dynamic tensile test has been conducted. Experiments were performed using a tensile Kolsky apparatus for impact velocities ranging from 10 to 40 m/s. Three different sample-gauge lengths -7, 30 and 50 mmwere considered for which the cross section diameter is 3.4 mm. The experiments revealed that the specimens' ductility to fracture depends on strain rate and sample length. Furthermore it was observed that, for those specimens having gauge lengths of 30 and 50 mm, the necking location varies with impact velocity. Numerical simulations of the dynamic tensile tests were carried out in order to characterize the dynamics of neck inception and development. For each specimen calculated, three types of boundary conditions were used, all of which match the experimentally measured strain-rate. It was pointed out that, while boundary conditions hardly affect the calculated stress-strain characteristics, they strongly affect the wave propagation dynamics in the specimen thus dictating the necking location.

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“…Accurate knowledge of those properties is usually required in different engineering applications such as aeronautical [1,2], automotive [3,4], naval [5,6] and manufacturing [7,8], where service conditions involve large strains at high strain rates.…”

Section: Introductionmentioning

confidence: 99%

Finite element analysis of AISI 304 steel sheets subjected to dynamic tension: The effects of martensitic transformation and plastic strain development on flow localization

Rodríguez-Martínez

Rittel

Zaera

et al. 2013

International Journal of Impact Engineering

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b s t r a c tThe paper presents a finite element study of the dynamic necking formation and energy absorption in AISI 304 steel sheets. The analysis emphasizes the effects of strain induced martensitic transformation (SIMT) and plastic strain development on flow localization and sample ductility. The material behavior is described by a constitutive model proposed by the authors which includes the SIMT at high strain rates. The process of martensitic transformation is alternatively switched on and off in the simulations in order to highlight its effect on the necking inception. Two different initial conditions have been applied: specimen at rest which is representative of a regular dynamic tensile test, and specimen with a prescribed initial velocity field in the gauge which minimizes longitudinal plastic wave propagation in the tensile specimen. Plastic waves are found to be responsible for a shift in the neck location, may also mask the actual constitutive performance of the material, hiding the expected increase in ductility and energy absorption linked to the improved strain hardening effect of martensitic transformation. On the contrary, initializing the velocity field leads to a symmetric necking pattern of the kind described in theoretical works, which reveals the actual material behavior. Finally the analysis shows that in absence of plastic waves, and under high loading rates, the SIMT may not further increase the material ductility.

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Effect of strain rate on the forming behaviour of sheet metals

Cited by 99 publications

References 21 publications

Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process

Experimental and Numerical Studies of Sheet Metal Forming with Damage Using Gas Detonation Process

Dynamic tensile necking: Influence of specimen geometry and boundary conditions

Finite element analysis of AISI 304 steel sheets subjected to dynamic tension: The effects of martensitic transformation and plastic strain development on flow localization

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