Optimization of elastic material parameters of sheet metal with FEMU and DIC

Schmaltz, Stefan; Willner, Kai

doi:10.1002/pamm.201110208

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…6 (left) points to the rolling direction. Uniaxial tensile tests with DC04 steel for example show a value of 188.84 MPa in 0° and 196.85 MPa in 90° direction, as reported in [12].…”

Section: The Verification By Measurementsupporting

confidence: 52%

Experimental Verification of a Benchmark Forming Simulation

Landkammer

Loderer

Krebs

et al. 2015

KEM

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Forming of near-net-shaped and load-adapted functional components, as it is developed in theTransregionalCollaborative Research Centreon Sheet-Bulk Metal FormingSFB/TR73, causes different problems, which lead to non-optimal manufacturing results. For these high complex processes the prediction of forming effects can only be realized by simulations. A stamping process of pressing eight punches into a circular blank is chosen for the considered investigations. This reference process is designed to reflect the main aspects, which strongly affect the final outcome of forming processes. These are the orthotropic material behaviour, the optimal design of the initial blank and the influences of different contact and friction laws. The aim of this work is to verify the results of finite element computations for the proposed forming process by experiments. Evaluation methods are presented to detect the influence of the anisotropy and also to quantify the optimal blank design, which is determined by inverse form finding. The manufacturing accuracy of the die plate and the corresponding roughness data of the milled surface are analysed, whereas metrological investigations are required. This is accomplished by the help of advanced measurement techniques like a multi-sensor fringe projection system and a white light interferometer. Regarding the geometry of the punches, micromilling of the die plate is also a real challenge, especially due to the hardness of the high-speed steelASP2023(approx. 63 HRC). The surface roughness of the workpiece before and after the forming process is evaluated to gain auxiliary data for enhancing the friction modelling and to characterise the contact behaviour.

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“…6 (left) points to the rolling direction. Uniaxial tensile tests with DC04 steel for example show a value of 188.84 MPa in 0° and 196.85 MPa in 90° direction, as reported in [12].…”

Section: The Verification By Measurementsupporting

confidence: 52%

Experimental Verification of a Benchmark Forming Simulation

Landkammer

Loderer

Krebs

et al. 2015

KEM

View full text Add to dashboard Cite

show abstract

“…This can be performed either by finite element simulations, where a constitutive model has to be assumed, or by experimental testing (or a combination of both). Shape optimization using finite elements might either be done by trial and error contour definitions, or by applying numerical tools from optimization …”

Section: Specimen's Shapementioning

confidence: 99%

“…The least‐squares formulation of the difference between experimental and numerical strains was optimized by means of a Gauss‐Newton algorithm. Inverse methods are also used in Schmaltz and Willner, for identifying the material parameters of various steel sheet cruciform specimens by means of a finite element updating method and the full‐field displacement field provided by a DIC system. An overview of identification methods for parameter identification based on full‐field measurements, was provided by Smits et al where different techniques were also applied for determining the elastic parameters in case of biaxial tensile tests.…”

Section: Introductionmentioning

confidence: 99%

Basic studies in biaxial tensile tests

2018

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Biaxial tensile experiments are an increasing test alternative of thin‐walled specimens to characterize the material behavior under mechanical agencies. This is mainly driven by digital image correlation systems to obtain information about the surface deformation. However, it is not as simple as a tensile test since we can only measure the deformation in a region on the specimen and not the stress state. The latter aspect of stress determination is discussed as well. In this article, we address several basic questions. First: can we obtain a homogenous strain state in cruciform‐like specimens? In this sense the shape will be discussed and a measure of homogeneity is introduced for proofing whether homogeneity can be guaranteed. Second: how can we reach large strains in the center of the specimens? This is connected to the specimen's geometry (arm reinforcement, slots, thinning of center, …). Furthermore, we discuss the problem of material parameter identification using biaxial tensile test information, which is connected to the concept of identifiability using finite elements. This is discussed at the simplest constitutive model, namely linear isotropic elasticity. Thus, the overall goal is connected to a critical review on biaxial experiments using cruciform specimens. The test materials are polymers.

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Optimization of elastic material parameters of sheet metal with FEMU and DIC

Cited by 2 publications

References 2 publications

Experimental Verification of a Benchmark Forming Simulation

Experimental Verification of a Benchmark Forming Simulation

Basic studies in biaxial tensile tests

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