| Autor: |
G. Meneghetti, M. Ricotta |
| Jazyk: |
angličtina |
| Rok vydání: |
2017 |
| Předmět: |
|
| Zdroj: |
Frattura ed Integrità Strutturale, Vol 11, Iss 41, Pp 299-306 (2017) |
| Druh dokumentu: |
article |
| ISSN: |
1971-8993 |
| DOI: |
10.3221/IGF-ESIS.41.4 |
| Popis: |
Metallic materials dissipate thermal energy when subjected to fatigue. Some of them, due a favorable combination of thermo-physical material properties, exhibit a significant temperature rise, which can be easily measured in-situ by means of thermocouples or infrared cameras. The heat energy dissipated in a unit volume of material per cycle (the Q parameter) has proven to be effective as a fatigue damage index in case of AISI 304L plain and notched specimens. Originally conceived and applied as a point-related quantity, recently Q has been averaged at the tip of propagating fatigue cracks (the Q* parameter) in order to correlate crack growth data gathered from fracture mechanics tests. The use of Q* seems interesting because (i) it can be evaluated in-situ from infrared temperature maps and (ii) crack acceleration due to excessive plasticity is likely to be accounted for. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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