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TMF Life Prediction of High Temperature Components Made of Cast Iron HiSiMo: Part II: Multiaxial Implementation and Component Assessment

  • HiSiMo cast irons are frequently used as material for high temperature components in engines as e.g. exhaust manifolds and turbo chargers. These components must withstand severe cyclic mechanical and thermal loads throughout their life cycle. The combination of thermal transients with mechanical load cycles results in a complex evolution of damage, leading to thermomechanical fatigue (TMF) of theHiSiMo cast irons are frequently used as material for high temperature components in engines as e.g. exhaust manifolds and turbo chargers. These components must withstand severe cyclic mechanical and thermal loads throughout their life cycle. The combination of thermal transients with mechanical load cycles results in a complex evolution of damage, leading to thermomechanical fatigue (TMF) of the material and, after a certain number of loading cycles, to failure of the component. In Part I of the paper, a fracture mechanics model for TMF life prediction was developed based on results of uniaxial tests. In this paper (Part II), the model is formulated for three-dimensional stress states, so that it can be applied in a post-processing step of a finite-element analysis. To obtain reliable stresses and (time dependent plastic) strains in the finite-element calculation, a time and temperature dependent plasticity model is applied which takes non-linear kinematic hardening into account. The material properties of the model are identified from the results of the uniaxial test. The plasticity model and the TMF life model are applied to assess the lifetime of an exhaust manifold.‚Ķshow moreshow less

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Metadaten
Author:Thomas SeifertGND, Radwan Hazime, Steven Dropps
Year of Publication:2014
Date of first Publication:2014/04/01
Language:English
GND Keyword:Hochtemperatur; Maschinenelement; Stahl
Parent Title (English):SAE International Journal of Materials and Manufacturing
Volume:7
Issue:2
ISSN:1946-3979 (Print)
ISSN:1946-3987 (e-ISSN)
First Page:421
Last Page:431
Document Type:Conference Proceeding
Institutes:Hochschule Offenburg / Bibliografie
Acces Right:Zugriffsbeschränkt
Release Date:2018/07/06
Licence (German):License LogoEs gilt das UrhG
Note:
SAE International Journal of Materials & Manufacturing SAE 2014 World Congress & Exhibition
DOI:https://doi.org/10.4271/2014-01-0905