Failure Analysis of Longeron Fitting via Microstructure Examination and Proposing Viable Mitigation Techniques / (Record no. 610815)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 02773nam a22001577a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 670 |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Shah, Syed Muhammad Wajeeh |
| 245 ## - TITLE STATEMENT | |
| Title | Failure Analysis of Longeron Fitting via Microstructure Examination and Proposing Viable Mitigation Techniques / |
| Statement of responsibility, etc. | Syed Muhammad Wajeeh Shah |
| 264 ## - PRODUCTION, PUBLICATION, DISTRIBUTION, MANUFACTURE, AND COPYRIGHT NOTICE | |
| Place of production, publication, distribution, manufacture | Islamabad : |
| Name of producer, publisher, distributor, manufacturer | SMME- NUST; |
| Date of production, publication, distribution, manufacture, or copyright notice | 2024. |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 134p. |
| Other physical details | Soft Copy |
| Dimensions | 30cm |
| 500 ## - GENERAL NOTE | |
| General note | This study aims to investigate the failure causes in a longeron fitting of transport<br/>aircraft and propose a mitigation strategy to prevent such defects. The study involves two<br/>phases to accomplish the desired objective. Firstly, an experimental approach to perform a<br/>failure analysis of the longeron fitting. This included techniques such as compositional<br/>analysis, stereoscopy for dimensional measurement of cracks, and fractographic analysis<br/>through XFR, SEM/EDX to determine the cause of the failure. Microscopic<br/>analysis revealed a crack originating from the recess area, which was further investigated<br/>to determine the cause of failure. The failure analysis revealed the existence of corrosion<br/>products along the recess as a major contributor to crack initiation, which was followed by<br/>deposition corrosion, as evidenced by the presence of Oxides and undiffused Silicon<br/>particles. To confirm the effect of stress concentration within the given design constraints,<br/>reverse engineering methods and numerical analysis were implemented to study the<br/>mechanical behavior of the fitting under static loading conditions. Furthermore, the<br/>mitigation techniques were developed to prevent corrosion-assisted crack growth by<br/>selecting a higher strength-to-weight ratio Al-Li (2195 T8) alloy, with a redesigning the<br/>longeron fitting with a larger fillet radius for the longeron fitting results in improvement of<br/>mechanical properties along with shifting of stress concentration region from recess edge<br/>towards the rear support side. Additionally, corrosion resistive coatings of the specimens<br/>with Sulphuric Acid Anodizing (SAA) and Chromic Acid Anodizing (CAA) were<br/>subjected to salt spray tests and exposed to a saline environment. The findings of the study<br/>suggest that SAA perform best under given conditions as most effective corrosion resistive<br/>coating, confirming it to be a comprehensive mitigation approach. The results of this study<br/>will provide valuable insights into the failure causes of the longeron fitting, which can<br/>improve the safety and efficiency of cargo aircraft operations and the risk of downtime and<br/>cost of repairs. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | MS Design and Manufacturing Engineering |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Supervisor : Dr. Shahid Ikramullah Butt |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="http://10.250.8.41:8080/xmlui/handle/123456789/45233">http://10.250.8.41:8080/xmlui/handle/123456789/45233</a> |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Koha item type | Thesis |
| Withdrawn status | Permanent Location | Current Location | Shelving location | Date acquired | Full call number | Barcode | Koha item type |
|---|---|---|---|---|---|---|---|
| School of Mechanical & Manufacturing Engineering (SMME) | School of Mechanical & Manufacturing Engineering (SMME) | E-Books | 08/06/2024 | 670 | SMME-TH-1039 | Thesis |