New biaxially loaded specimens for the analysis of damage and fracture in sheet metals

Gerke, Steffen; Adulyasak, Preawpan; Brünig, Michael

doi:10.1016/j.ijsolstr.2017.01.027

Cited by 64 publications

(39 citation statements)

References 28 publications

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“…The cruciform X0-specimen is characterized by crosswise arranged notches that are grooved in two dimensions and a central opening. Its geometry is the outcome of several improvements of a previously proposed specimen geometry and corresponding numerical studies performed by [3]. Due to its symmetry the same localization behavior is achieved in all 4 notches as can be seen in Fig.…”

Section: Biaxial Experiments Under Non-proportional Loadingmentioning

confidence: 81%

Damage and failure mechanisms of ductile metals in biaxial experiments with non‐proportional loading paths

Zistl

Gerke

Brünig

2018

Proc Appl Math and Mech

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The paper deals with an experimental series of the biaxial X0-specimen to study the loading path dependence of ductile damage and fracture under non-proportional loading. The damage and fracture behavior of ductile metals depend on the stress state, consequently the material deterioration has to be studied experimentally to develop and validate the corresponding material model. Experimentally the specimen surfaces have been monitored by digital image correlation (DIC) while the fracture surfaces have been analyzed by scanning electron microscopy (SEM). The experimental results based on proportional and non-proportional loading paths clearly show that damage and fracture processes are affected by the loading history.

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Section: Biaxial Experiments Under Non-proportional Loadingmentioning

confidence: 81%

Damage and failure mechanisms of ductile metals in biaxial experiments with non‐proportional loading paths

Zistl

Gerke

Brünig

2018

Proc Appl Math and Mech

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“…In this context, a new experimental program with biaxially loaded specimens has been proposed [9,21], where stress states have been analyzed by corresponding numerical simulations to predict damage and fracture modes. In addition, [20] proposed several new geometries and first experimental results with the X0-specimen have been presented [13,22,23]. This specimen ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Shape optimization of the X0-specimen: theory, numerical simulation and experimental verification

et al. 2020

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The paper deals with the gradient based shape optimization of the biaxial X0-specimen, which has been introduced and examined in various papers, under producibility restrictions and the related experimental verification. The original, engineering based design of the X0-specimen has been applied successfully to different loading conditions persisting the question if relevant stress states could be reached by optimizing the geometry. Specimens with the initial as well as with the two load case dependent optimized geometries have been fabricated of the aluminum alloy sheets (AlSi1MgMn; EN AW 6082-T6) and tested. The strain fields in critical regions of the specimens have been recorded by digital image correlation technique. In addition, scanning electron microscope analysis of the fracture surfaces clearly indicate the stress state dependent damage processes. Consequently, the presented gradient based optimization technique facilitated significant improvements to study the damage and fracture processes in a more purposeful way.

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“…Gerke et al [3] developed new biaxial specimens that widen the range of stress triaxiality in one specimen at different loading scenarios. It classifies the stress state to be tensile if η > 0, compressive if η < 0 or pure shear if η ≈ 0.…”

Section: Introductionmentioning

confidence: 99%

“…It classifies the stress state to be tensile if η > 0, compressive if η < 0 or pure shear if η ≈ 0. Gerke et al [3] developed new biaxial specimens that widen the range of stress triaxiality in one specimen at different loading scenarios. With these specimens it is possible to capture different micro-mechanical damage mechanisms that arise at different stress triaxiality states with only one specimen.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of elastoplastic structures and application to optimal specimen design

Liedmann

Barthold

Gerke

et al. 2019

Proc Appl Math and Mech

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This paper is concerned with the shape improvement of novel specimens for biaxial experiments in terms of optimal stress states, characterized by the stress triaxiality. For this, gradient based optimization strategies are utilized and the needed sensitivities are obtained using a variational approach. Considering elastoplastic material behavior, the deformation history as well as its sensitivity has to be taken into account. In a first step, the material parameters have to be identified for the given material (AlCuMgSi). With the identified parameters, a chosen specimen is numerically analyzed and optimized with the aim to achieve a preferably homogeneous stress triaxiality distribution in the relevant part of the specimen.

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New biaxially loaded specimens for the analysis of damage and fracture in sheet metals

Cited by 64 publications

References 28 publications

Damage and failure mechanisms of ductile metals in biaxial experiments with non‐proportional loading paths

Damage and failure mechanisms of ductile metals in biaxial experiments with non‐proportional loading paths

Shape optimization of the X0-specimen: theory, numerical simulation and experimental verification

Sensitivity analysis of elastoplastic structures and application to optimal specimen design

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