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Utmattningsegenskaper hos wolfram vid olika temperaturer

Elamzon, Jonathan and Tydén, Emil (2013) In Diploma work FKM820 20132
Mechanics
Abstract
In order to predict the life expectancy for the tungsten target at the planned European spallation source, the fatigue properties of pure tungsten have been studied at room temperature and 300°C. Constant amplitude, stress controlled fatigue tests have been performed to investigate high cycle fatigue and cyclic hardening effects have been studied using multistep, strain controlled fatigue tests. The fatigue limit for rolled tungsten in the rolling direction was found to be in the range 285-300 MPa at room temperature as well as at 300°C. However, these are preliminary results and need to be confirmed by extensive testing.

At 300°C, the tungsten specimens showed relatively more ductility and less notch sensitive behavior. In the... (More)
In order to predict the life expectancy for the tungsten target at the planned European spallation source, the fatigue properties of pure tungsten have been studied at room temperature and 300°C. Constant amplitude, stress controlled fatigue tests have been performed to investigate high cycle fatigue and cyclic hardening effects have been studied using multistep, strain controlled fatigue tests. The fatigue limit for rolled tungsten in the rolling direction was found to be in the range 285-300 MPa at room temperature as well as at 300°C. However, these are preliminary results and need to be confirmed by extensive testing.

At 300°C, the tungsten specimens showed relatively more ductility and less notch sensitive behavior. In the transverse direction, based on limited number of tests, he fatigue limit was found to be in the range 150-165MPa at room temperature. urther testing is required to confirm the reliability of these measurements.

Two forged specimens were tested at room temperature and one of the
specimens could sustain a stress-amplitude of 450MPa without failing.
General conclusions on cyclic hardening effects in the material could not be made with the available data and needs further study. (Less)
Please use this url to cite or link to this publication:
author
Elamzon, Jonathan and Tydén, Emil
supervisor
organization
alternative title
Fatigue Properties of Pure Tungsten at different Temperatures
course
FKM820 20132
year
type
H2 - Master's Degree (Two Years)
subject
publication/series
Diploma work
report number
ISRN LUTFD2/TFMT--13/5043--SE
ISSN
ISRN
language
English
id
4024982
date added to LUP
2013-09-16 12:33:32
date last changed
2013-09-16 12:33:32
@misc{4024982,
  abstract     = {In order to predict the life expectancy for the tungsten target at the planned European spallation source, the fatigue properties of pure tungsten have been studied at room temperature and 300°C. Constant amplitude, stress controlled fatigue tests have been performed to investigate high cycle fatigue and cyclic hardening effects have been studied using multistep, strain controlled fatigue tests. The fatigue limit for rolled tungsten in the rolling direction was found to be in the range 285-300 MPa at room temperature as well as at 300°C. However, these are preliminary results and need to be confirmed by extensive testing.

At 300°C, the tungsten specimens showed relatively more ductility and less notch sensitive behavior. In the transverse direction, based on limited number of tests, he fatigue limit was found to be in the range 150-165MPa at room temperature. urther testing is required to confirm the reliability of these measurements.

Two forged specimens were tested at room temperature and one of the
specimens could sustain a stress-amplitude of 450MPa without failing.
General conclusions on cyclic hardening effects in the material could not be made with the available data and needs further study.},
  author       = {Elamzon, Jonathan and Tydén, Emil},
  issn         = {ISRN},
  language     = {eng},
  note         = {Student Paper},
  series       = {Diploma work},
  title        = {Utmattningsegenskaper hos wolfram vid olika temperaturer},
  year         = {2013},
}