Effect of contact geometry on the contact stresses in a flat with rounded edge contact
The blade-disc dovetail interface in an aero-engine compressor is characterized by a non-uniform pressure distribution which can be obtained by an equivalent flat with rounded edge-on-plate configuration. The contact tractions for a mating pair are affected by many parameters which include, contact...
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| Format: | Article |
| Language: | English |
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Gruppo Italiano Frattura
2019-04-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | https://www.fracturae.com/index.php/fis/article/view/2345/2477 |
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| _version_ | 1841562998969204736 |
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| author | Pankaj Dhaka Raghu V. Prakash |
| author_facet | Pankaj Dhaka Raghu V. Prakash |
| author_sort | Pankaj Dhaka |
| collection | DOAJ |
| description | The blade-disc dovetail interface in an aero-engine compressor is characterized by a non-uniform pressure distribution which can be obtained by an equivalent flat with rounded edge-on-plate configuration. The contact tractions for a mating pair are affected by many parameters which include, contact geometry, loading conditions, and material properties; with contact geometry being one of the prominent factors. In the present work, a 2-D elastic and elasto-plastic finite element analysis has been carried out for a rounded contact geometry to study the influence of the radius of the corners R鑒 and length of the flat region �2a�. It is observed that the peak tensile stress in the fretting direction decreases with increasing �a� (for constant �R�) which is likely to delay the crack initiation. Also, as compared to elasto-plastic analysis, elastic analysis overestimates peak tensile stress and possibly gives a conservative estimate for the fretting fatigue life. Further, the effect of modelling elastic-plastic behaviour is significant for low a/R ratio (for constant �R�). However, opposite trend was observed when �R� was varied keeping �a� constant. Also, it is found that the effect of contact geometry cannot be characterized using a single parameter like a/R ratio or contact area. |
| format | Article |
| id | doaj-art-71529f43ada34ee5be8c54ef2081c11b |
| institution | Kabale University |
| issn | 1971-8993 |
| language | English |
| publishDate | 2019-04-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-71529f43ada34ee5be8c54ef2081c11b2025-01-03T00:27:11ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89932019-04-01134863063810.3221/IGF-ESIS.48.6010.3221/IGF-ESIS.48.60Effect of contact geometry on the contact stresses in a flat with rounded edge contactPankaj DhakaRaghu V. PrakashThe blade-disc dovetail interface in an aero-engine compressor is characterized by a non-uniform pressure distribution which can be obtained by an equivalent flat with rounded edge-on-plate configuration. The contact tractions for a mating pair are affected by many parameters which include, contact geometry, loading conditions, and material properties; with contact geometry being one of the prominent factors. In the present work, a 2-D elastic and elasto-plastic finite element analysis has been carried out for a rounded contact geometry to study the influence of the radius of the corners R鑒 and length of the flat region �2a�. It is observed that the peak tensile stress in the fretting direction decreases with increasing �a� (for constant �R�) which is likely to delay the crack initiation. Also, as compared to elasto-plastic analysis, elastic analysis overestimates peak tensile stress and possibly gives a conservative estimate for the fretting fatigue life. Further, the effect of modelling elastic-plastic behaviour is significant for low a/R ratio (for constant �R�). However, opposite trend was observed when �R� was varied keeping �a� constant. Also, it is found that the effect of contact geometry cannot be characterized using a single parameter like a/R ratio or contact area.https://www.fracturae.com/index.php/fis/article/view/2345/2477DovetailFlat with rounded edgeFrettingContact geometry |
| spellingShingle | Pankaj Dhaka Raghu V. Prakash Effect of contact geometry on the contact stresses in a flat with rounded edge contact Fracture and Structural Integrity Dovetail Flat with rounded edge Fretting Contact geometry |
| title | Effect of contact geometry on the contact stresses in a flat with rounded edge contact |
| title_full | Effect of contact geometry on the contact stresses in a flat with rounded edge contact |
| title_fullStr | Effect of contact geometry on the contact stresses in a flat with rounded edge contact |
| title_full_unstemmed | Effect of contact geometry on the contact stresses in a flat with rounded edge contact |
| title_short | Effect of contact geometry on the contact stresses in a flat with rounded edge contact |
| title_sort | effect of contact geometry on the contact stresses in a flat with rounded edge contact |
| topic | Dovetail Flat with rounded edge Fretting Contact geometry |
| url | https://www.fracturae.com/index.php/fis/article/view/2345/2477 |
| work_keys_str_mv | AT pankajdhaka effectofcontactgeometryonthecontactstressesinaflatwithroundededgecontact AT raghuvprakash effectofcontactgeometryonthecontactstressesinaflatwithroundededgecontact |