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Lifetime Assessment of Cylinder Heads for Efficient Heavy Duty Engines Part I: A Discussion on Thermomechanical and High-Cycle Fatigue as Well as Thermophysical Properties of Lamellar Graphite Cast Iron GJL250 and Vermicular Graphite Cast Iron GJV450

  • Cast iron materials are used as materials for cylinder heads for heavy duty internal combustion engines. These components must withstand severe cyclic mechanical and thermal loads throughout their service life. While high-cycle fatigue (HCF) is dominant for the material in the water jacket region, the combination of thermal transients with mechanical load cycles results in thermomechanical fatigueCast iron materials are used as materials for cylinder heads for heavy duty internal combustion engines. These components must withstand severe cyclic mechanical and thermal loads throughout their service life. While high-cycle fatigue (HCF) is dominant for the material in the water jacket region, the combination of thermal transients with mechanical load cycles results in thermomechanical fatigue (TMF) of the material in the fire deck region, even including superimposed TMF and HCF loads. Increasing the efficiency of the engines directly leads to increasing combustion pressure and temperature and, thus, lower safety margins for the currently used cast iron materials or alternatively the need for superior cast iron materials. In this paper (Part I), the TMF properties of the lamellar graphite cast iron GJL250 and the vermicular graphite cast iron GJV450 are characterized in uniaxial tests and a mechanism-based model for TMF life prediction is developed for both materials. The model can be used to estimate the fatigue life of components by means of finite-element calculations (Part II of the paper) and supports engineers in finding the appropriate material and design. Furthermore, the effect of the elastic, plastic and creep properties of the materials on the fatigue life can be evaluated with the model. However, for a material selection also the thermophysical properties, controlling to a high level the thermal stresses in the component, must be considered. Hence, the need for integral concepts for material characterization and selection from a multitude of existing and soon-to-be developed cast iron materials is discussed.show moreshow less

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Metadaten
Author:Thomas SeifertORCiDGND, Philipp von Hartrott, Kristopher Boss, Paul Wynthein
Year of Publication:2017
Date of first Publication:2017/03/28
Language:English
GND Keyword:Eisenguss; Ermüdung; Simulation
DDC classes:600 Technik, Medizin, angewandte Wissenschaften
Parent Title (English):SAE International journal of materials and manufacturing
Volume:10
Issue:2
ISSN:1946-3979
First Page:359
Last Page:365
Document Type:Article (reviewed)
Institutes:Bibliografie
Release Date:2018/01/19
Licence (German):License LogoEs gilt das UrhG
URL:http://papers.sae.org/2017-01-0349/
DOI:https://doi.org/10.4271/2017-01-0349