Meinhard Kuna

TU Bergakademie Freiberg

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Martin Abendroth

TU Bergakademie Freiberg

Geralf Hütter

TU Bergakademie Freiberg

Horst Biermann

TU Bergakademie Freiberg

Andreas Ricoeur

University of Kassel

Uwe Mühlich

Austral University of Chile

Andreas Seupel

TU Bergakademie Freiberg

Lutz Zybell

Leibniz Institute of Polymer Research

Stephan Roth

TU Bergakademie Freiberg

Andreas Burgold

TU Bergakademie Freiberg

Michael Budnitzki

Forschungszentrum Jülich

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TU Bergakademie Freiberg

124

John Wiley & Sons (Germany)

Max-Planck-Institut für Nachhaltige Materialien

Institute of Metallurgy

VDEh-Betriebsforschungsinstitut

Jernkontoret (Sweden)

Chinese Society for Electrical Engineering

Max Planck Society

TU Dresden

Chemnitz University of Technology

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A Material Model for TRIP‐Steels and its Application to a CrMnNi Cast Alloy

steel research international (2011)

Stefan Prüger Meinhard Kuna Steffen Wolf Lutz Krüger

Abstract A material model is presented that accounts for strain rate dependent inelastic deformation and strain‐induced phase transformation in TRIP‐steels. Modifications for the kinetics equations of the strain‐induced phase transformation, introduced by Stringfellow, are proposed to overcome a drawback of Stringfellow's model. A parameter identification strategy that relies on Gauss‐Markov estimates is used to determine the model parameters from experimental data of a recently developed cast TRIP‐steel. Good agreement is observed between experimental results of the compression test and the corresponding finite element simulation employing the proposed model. This forms the basis for future applications of the material model in the design of composites and structures.

Basis (linear algebra)

Alloy steel

Experimental data

10.1002/srin.201100072

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Citations (17)

Material Forces in Consideration of Phase Transformation in TRIP-steel

Procedia Materials Science (2014)

Andreas Burgold Meinhard Kuna Stefan Prüger

The phase transformation in austenitic TRIP-steels contributes to favourable mechanical properties and may affect their fracture behavior. Therefore, the influence of the phase transformation on the crack driving force is investigated. The concept of material forces is applied to a casted CrMnNi TRIP-steel by incorporating inelastic material and transformation behavior via the material model. The resultant material force expression for the near tip crack driving force is presented and evaluated by summing up nodal material forces. The advantage of this method is the separated calculation of material forces due to dissipation by plastic deformation and phase transformation as well as the material force acting directly at the crack tip. The TRIP-effect implies a considerable contribution to the material forces, i.e. the driving force for crack propagation is reduced, which indicates a shielding effect.

TRIP steel

10.1016/j.mspro.2014.06.077

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Citations (4)

Introduction

Solid mechanics and its applications (2013)

Meinhard Kuna

Cohesion (chemistry)

10.1007/978-94-007-6680-8_1

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Citations (2)

Adaptive finite element modeling of stationary and propagating cracks in piezoelectric structures

Archives of Mechanics (2011)

Ł. Jański Meinhard Kuna

In the present paper, simulation results of stationary and propagating cracks in piezoelectric test specimens are presented. The simulations have been carried out with a self-developed adaptive finite element computer program. Two specimen configurations are investigated, i.e. the compact tension and three-point bending specimens. In the analysis of the propagating crack in the compact tension specimen, the fracture toughness change due to the change of the electric field in the test domain is taken into account. To prove the importance of the fracture toughness anisotropy assumption, crack growth simulations for the three-point bending specimens are reported.

Tension (geology)

Source

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Citations (11)

AN EFFICIENT FINITE-ELEMENT-ALGORITHM FOR THREE-DIMENSIONAL FRACTURE PROBLEMS

Elsevier eBooks (1984)

Meinhard Kuna Victor E. Schmidt

Basis (linear algebra)

10.1016/b978-1-4832-8440-8.50089-2

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Citations (1)

Cohesive Zone Modeling of Stable Crack Propagation in Highly Ductile Steel

Key engineering materials (2018)

Andreas Burgold Stephan Roth Meinhard Kuna

A recent cohesive zone model is applied to the simulation of crack extension in austenitic stainless steel under large scale yielding conditions. The shape of the corresponding exponential traction-separation-relation can be modified in a wide range. In order to investigate the sensitivity regarding the cohesive zone parameters, a systematic parametric study is performed. The shape of the traction-separation envelope has a minor effect on the results compared to the cohesive strength and the work of separation. The aim is to fit experimental data by an appropriate choice of these parameters. Therefore, not only force-displacement curves should be used, but also crack growth resistance curves should be employed. A promising strategy for parameter identification is derived.

Cohesive zone model

10.4028/www.scientific.net/kem.774.167

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Citations (3)

A thermomechanical constitutive model for phase transformations in silicon under pressure and contact loading conditions

International Journal of Solids and Structures (2012)

Michael Budnitzki Meinhard Kuna

Asperity (geotechnical engineering)

Abrasive machining

Chip formation

Lapping

10.1016/j.ijsolstr.2012.02.004

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Citations (14)

A non-iterative parameter identification procedure for the non-local Gurson-Tvergaard-Needleman model based on standardized experiments

Research Square (Research Square) (2022)

Omar El Khatib Geralf Hütter Rinh‐Dinh Pham Andreas Seupel Meinhard Kuna

Abstract Damage mechanics models exhibit favorable properties such as the intrinsic influence of stress triaxiality on damage evolution and the prediction of crack initiation as well as propagation leading to structural failure. However, their application requires advanced expertise hindering the transfer of these models into industrial practice. Especially the parameter calibration can be identified as a key obstacle. In this paper, a simplified procedure is proposed for a non-local extension of the Gurson-Tvergaard-Needleman model (GTN), which is a highly accepted model for ductile failure of metals. The procedure is iteration free and finally requires experimental input data from only two standardized tests. The parameters are determined using look-up diagrams created on the basis of systematic simulations and made available for different material behavior covering the majority of ductile metals. Benchmark tests for three different steels are conducted to evaluate the robustness of the proposed procedure. The reliability of the GTN model is validated for all investigated materials.

Robustness

Experimental data

Benchmark (surveying)

10.21203/rs.3.rs-2037382/v1

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Citations (0)

Practical Applications

Solid mechanics and its applications (2013)

Meinhard Kuna

Austempering

Ductility (Earth science)

10.1007/978-94-007-6680-8_9