TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Metzger, Mario
A1  - Seifert, Thomas
T1  - A Mechanism-Based Model for LCF/HCF and TMF/HCF Life Prediction: Multiaxial Formulation, Finite-Element Implementation and Applicationto Cast Iron
JF  - TECHNISCHE MECHANIK
N2  - In this paper, the multiaxial formulation of a mechanism-based model for fatigue life prediction is presented whichcan be applied to low-cycle fatigue (LCF) and thermomechanical fatigue (TMF) problems in which high-cycle fa-tigue loadings are superimposed. The model assumes that crack growth is the lifetime limiting mechanism and thatthe crack advance in a loading cycleda/dNcorrelates with the cyclic crack-tip opening displacement ΔCTOD.The multiaxial formulation makes use of fracture mechanics solutions and thus, does not need additional modelparameters quantifying the effect of the multiaxiality.  Furthermore, the model includes contributions of HCF on ΔCTODand assesses the effect of the direction of the HCF loadings with respect to LCF or TMF loadings inthe life prediction.  The model is implemented into the finite-element program ABAQUS. It is applied to predictthe fatigue life of a thermomechanically loaded notched specimen that should represent the situation between theinlet and outlet bore holes of cylinder heads. A good correlation of the predicted and the measured fatigue lives isobtained.
KW  - Gusseisen
KW  - Ermüdung
KW  - Finite-Elemente-Methode
Y1  - 2012
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0011-n-2364596
UN  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0011-n-2364596
UR  - http://www.uni-magdeburg.de/ifme/zeitschrift_tm/2012_Heft2_5/31_Metzger.pdf
SN  - 0232-3869
SS  - 0232-3869
VL  - 32
IS  - 2-5
SP  - 435
EP  - 445
CY  - Magdeburg
ER  - 
TY  - JOUR
U1  - Zeitschriftenartikel, wissenschaftlich - begutachtet (reviewed)
A1  - Metzger, Mario
A1  - Seifert, Thomas
T1  - Computational assessment of the microstructure-dependent plasticity of lamellar gray cast iron – Part I: Methods and microstructure-based models
JF  - International Journal of Solids and Structures
N2  - This paper focuses on the microstructure-dependent inelastic behavior of lamellar gray cast iron. It comprises the reconstruction of three dimensional volume elements by use of the serial sectioning method for the materials GJL-150, GJL-250 and GJL-350. The obtained volume elements are prepared for the numerical analyses by means of finite-element method. In the finite-element analysis, the metallic matrix is modeled with an elastic–plastic deformation law. The graphite inclusions are modeled nonlinear elastic with a decreasing value of Young’s modulus for increasing tensile loading. Thus, the typical tension–compression asymmetry of this material class can be described. The stress–strain curves obtained with the microstructure-based finite-element models agree well with experimental curves of tension and compression tests. Besides the analysis of the whole volume element, the scatter of the stress–strain response in smaller statistical volume elements is investigated. Furthermore, numerical studies are performed to reduce computational costs.
KW  - Gusseisen
KW  - Lamellengrafit
KW  - Mikrostruktur
Y1  - 2015
SN  - 0020-7683
SS  - 0020-7683
U6  - https://dx.doi.org/10.1016/j.ijsolstr.2015.04.016
DO  - https://dx.doi.org/10.1016/j.ijsolstr.2015.04.016
VL  - 66
SP  - 184
EP  - 193
PB  - Elsevier
ER  -