Experimental estimation of the heat energy dissipated in a volume surrounding the tip of a fatigue crack
Fatigue crack initiation and propagation involve plastic strains that require some work to be done on the material. Most of this irreversible energy is dissipated as heat and consequently the material temperature increases. The heat being an indicator of the intense plastic strains occurring at th...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Gruppo Italiano Frattura
2016-01-01
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| Series: | Fracture and Structural Integrity |
| Subjects: | |
| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero35/numero_35_art_20.pdf |
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| Summary: | Fatigue crack initiation and propagation involve plastic strains that require some work to be done
on the material. Most of this irreversible energy is dissipated as heat and consequently the material temperature
increases. The heat being an indicator of the intense plastic strains occurring at the tip of a propagating fatigue
crack, when combined with the Neuber’s structural volume concept, it might be used as an experimentally
measurable parameter to assess the fatigue damage accumulation rate of cracked components. On the basis of a
theoretical model published previously, in this work the heat energy dissipated in a volume surrounding the
crack tip is estimated experimentally on the basis of the radial temperature profiles measured by means of an
infrared camera. The definition of the structural volume in a fatigue sense is beyond the scope of the present
paper. The experimental crack propagation tests were carried out on hot-rolled, 6-mm-thick AISI 304L stainless
steel specimens subject to completely reversed axial fatigue loading. |
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| ISSN: | 1971-8993 1971-8993 |