The Effect of Residual Stress on the Distortion of Gray Iron Brake Disks
- Authors
- Shin, M. W.; Jang, G. H.; Kim, J. K.; Kim, H. Y.; Jang, Ho
- Issue Date
- 4월-2013
- Publisher
- SPRINGER
- Keywords
- automotive; cast irons; heat treating; tribology
- Citation
- JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE, v.22, no.4, pp.1129 - 1135
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
- Volume
- 22
- Number
- 4
- Start Page
- 1129
- End Page
- 1135
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/103611
- DOI
- 10.1007/s11665-012-0397-7
- ISSN
- 1059-9495
- Abstract
- Thermal distortion of gray iron brake disks due to residual stress and its effect on brake vibrations were studied. The residual stress of heat- and non-heat-treated gray iron disks was measured using neutron scattering. Dynamometer tests were performed to measure the friction force oscillation caused by the disk runout during brake applications. High-temperature tensile tests were carried out to find out possible plastic deformation due to residual stress during brake applications. The results showed that the average residual stress of the heat-treated disk (47.6 MPa) was lower than that of the non-heat-treated disk (99.6 MPa). Dynamometer tests at high temperatures (up to 600 A degrees C) indicated that the residual stress pronounced the runout: the increase in disk runout after the tests for the non-heat-treated sample was more than twice that for the heat-treated sample. This difference correlated well with the neutron scattering results and the dimensional changes after a separate vacuum heat treatment. The high-temperature tensile tests showed severe reductions in yield strength at 600 A degrees C, suggesting that disks produced with no stress relaxation could be deformed during severe braking.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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