AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS
Loss of pre-load with time, commonly known as ‘Relaxation’ is an established phenomena. Behaviour of a bolted joint depends upon the pre-load in the bolts in use, not the pre-load introduced by the mechanic. Loss of pre-load is expected due to the many factors such as embedment relaxation, gasket cr...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
IIUM Press, International Islamic University Malaysia
2015-05-01
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| Series: | International Islamic University Malaysia Engineering Journal |
| Online Access: | http://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/539 |
| _version_ | 1818492272223715328 |
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| author | Muhammad Abid Muhammad Shahid Khalil Hafiz Abdul Wajid |
| author_facet | Muhammad Abid Muhammad Shahid Khalil Hafiz Abdul Wajid |
| author_sort | Muhammad Abid |
| collection | DOAJ |
| description | Loss of pre-load with time, commonly known as ‘Relaxation’ is an established phenomena. Behaviour of a bolted joint depends upon the pre-load in the bolts in use, not the pre-load introduced by the mechanic. Loss of pre-load is expected due to the many factors such as embedment relaxation, gasket creep, elastic interactions, and vibration loosening or stress relaxation. In a gasketed joint, due to the gasket flexibility, relaxation is always substantial during preliminary passes, as 80 to 100% loss is not uncommon in almost all the bolts, resulting in a dynamic behaviour. Pre-load in a gasketed joint is stabilized and retained to certain extent in the final passes only. In a non-gasketed joint, due to no gasket and no rotation its static behaviour is concluded. This paper highlights the factors affecting the amount of relaxation with time and presents important considerations that can reduce this. Both the short and long term relaxations are recorded and a ‘best fit’ model for relaxation behaviour is derived. |
| first_indexed | 2024-12-10T17:40:51Z |
| format | Article |
| id | doaj.art-e2ae56cb511a4a7094da455cb00f998f |
| institution | Directory Open Access Journal |
| issn | 1511-788X 2289-7860 |
| language | English |
| last_indexed | 2024-12-10T17:40:51Z |
| publishDate | 2015-05-01 |
| publisher | IIUM Press, International Islamic University Malaysia |
| record_format | Article |
| series | International Islamic University Malaysia Engineering Journal |
| spelling | doaj.art-e2ae56cb511a4a7094da455cb00f998f2022-12-22T01:39:23ZengIIUM Press, International Islamic University MalaysiaInternational Islamic University Malaysia Engineering Journal1511-788X2289-78602015-05-0116110.31436/iiumej.v16i1.539AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTSMuhammad Abid0Muhammad Shahid Khalil1Hafiz Abdul Wajid2Interdisciplinary Research Center, COMSATS Institute of Information Technology, Wah CanttDepartment of Mechanical Engineering, University of Engineering and Technology, Taxila,Department of Mathematics, COMSATS Institute of Information Technology, Lahore Department of Electrical Engineering, Islamic University Medina, KSALoss of pre-load with time, commonly known as ‘Relaxation’ is an established phenomena. Behaviour of a bolted joint depends upon the pre-load in the bolts in use, not the pre-load introduced by the mechanic. Loss of pre-load is expected due to the many factors such as embedment relaxation, gasket creep, elastic interactions, and vibration loosening or stress relaxation. In a gasketed joint, due to the gasket flexibility, relaxation is always substantial during preliminary passes, as 80 to 100% loss is not uncommon in almost all the bolts, resulting in a dynamic behaviour. Pre-load in a gasketed joint is stabilized and retained to certain extent in the final passes only. In a non-gasketed joint, due to no gasket and no rotation its static behaviour is concluded. This paper highlights the factors affecting the amount of relaxation with time and presents important considerations that can reduce this. Both the short and long term relaxations are recorded and a ‘best fit’ model for relaxation behaviour is derived.http://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/539 |
| spellingShingle | Muhammad Abid Muhammad Shahid Khalil Hafiz Abdul Wajid AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS International Islamic University Malaysia Engineering Journal |
| title | AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS |
| title_full | AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS |
| title_fullStr | AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS |
| title_full_unstemmed | AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS |
| title_short | AN EXPERIMENTAL STUDY ON THE RELAXATION OF BOLTS |
| title_sort | experimental study on the relaxation of bolts |
| url | http://journals.iium.edu.my/ejournal/index.php/iiumej/article/view/539 |
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