Fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperature
Aircraft engine manufacturers have to demonstrate that handling surface anomalies in sensitive areas of discs are not critical for in-service life of a component. Currently, the models used consider anomalies as long cracks propagating from the first cycle, which introduces a certain degree of conse...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2014-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | http://dx.doi.org/10.1051/matecconf/20141416003 |
| _version_ | 1818399816075444224 |
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| author | Gourdin Stéphane Doremus Luc Nadot Yves Hénaff Gilbert Pierret Stéphane |
| author_facet | Gourdin Stéphane Doremus Luc Nadot Yves Hénaff Gilbert Pierret Stéphane |
| author_sort | Gourdin Stéphane |
| collection | DOAJ |
| description | Aircraft engine manufacturers have to demonstrate that handling surface anomalies in sensitive areas of discs are not critical for in-service life of a component. Currently, the models used consider anomalies as long cracks propagating from the first cycle, which introduces a certain degree of conservatism when calculating the fatigue life of surface flaws. Preliminary studies have shown that the first stages of crack propagation from surface anomalies are responsible for the conservative results. Thus, the aim of the study is to characterize the crack propagation from typical surface anomalies and to establish a new crack growth model, which can account for the micro-propagation stage. To separate the effects of the geometry of the anomalies and the residual stress state after introduction of the surface flaws, two V-type anomalies are studied: scratches and dents. Different studies have shown that the residual stresses beneath the anomalies seem to control the fatigue life of samples exhibiting scratches and dents. In order to monitor the crack micro-propagation, a direct current potential drop technique, coupled with heat tints is used during fatigue tests at elevated temperature. Thermal treatments releasing the residual stresses are also used to decouple the effect of crack morphology and residual stresses. |
| first_indexed | 2024-12-14T07:26:41Z |
| format | Article |
| id | doaj.art-d456abec80f846b0a9cfa40029e8b647 |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-14T07:26:41Z |
| publishDate | 2014-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-d456abec80f846b0a9cfa40029e8b6472022-12-21T23:11:29ZengEDP SciencesMATEC Web of Conferences2261-236X2014-01-01141600310.1051/matecconf/20141416003matecconf_eurosuperalloys14_16003Fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperatureGourdin StéphaneDoremus LucNadot Yves0Hénaff Gilbert1Pierret Stéphane2Institut Pprime UPR CNRS 3346, Département Physique et Mécanique des Matériaux, ISAE-ENSMAInstitut Pprime UPR CNRS 3346, Département Physique et Mécanique des Matériaux, ISAE-ENSMASnecma, Etablissement de VillarocheAircraft engine manufacturers have to demonstrate that handling surface anomalies in sensitive areas of discs are not critical for in-service life of a component. Currently, the models used consider anomalies as long cracks propagating from the first cycle, which introduces a certain degree of conservatism when calculating the fatigue life of surface flaws. Preliminary studies have shown that the first stages of crack propagation from surface anomalies are responsible for the conservative results. Thus, the aim of the study is to characterize the crack propagation from typical surface anomalies and to establish a new crack growth model, which can account for the micro-propagation stage. To separate the effects of the geometry of the anomalies and the residual stress state after introduction of the surface flaws, two V-type anomalies are studied: scratches and dents. Different studies have shown that the residual stresses beneath the anomalies seem to control the fatigue life of samples exhibiting scratches and dents. In order to monitor the crack micro-propagation, a direct current potential drop technique, coupled with heat tints is used during fatigue tests at elevated temperature. Thermal treatments releasing the residual stresses are also used to decouple the effect of crack morphology and residual stresses.http://dx.doi.org/10.1051/matecconf/20141416003 |
| spellingShingle | Gourdin Stéphane Doremus Luc Nadot Yves Hénaff Gilbert Pierret Stéphane Fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperature MATEC Web of Conferences |
| title | Fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperature |
| title_full | Fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperature |
| title_fullStr | Fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperature |
| title_full_unstemmed | Fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperature |
| title_short | Fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperature |
| title_sort | fatigue crack growth from handling surface anomalies in a nickel based superalloy at high temperature |
| url | http://dx.doi.org/10.1051/matecconf/20141416003 |
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