Damage in composite-metal adhesive joints under low velocity impact conditions / (Record no. 607307)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 03304nam a22001577a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 621 |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Ashraf, Muhammad Umar Bin |
| 245 ## - TITLE STATEMENT | |
| Title | Damage in composite-metal adhesive joints under low velocity impact conditions / |
| Statement of responsibility, etc. | Muhammad Umar Bin Ashraf |
| 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 | 2023. |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 67p. |
| Other physical details | Soft Copy |
| Dimensions | 30cm |
| 520 ## - SUMMARY, ETC. | |
| Summary, etc. | Since the advancement of science and technology, the field of composites has moved from basic<br/>composite material such as wood to strongest composite materials such as graphene.<br/>Unfortunately, the cost of the most advanced composite materials is very high mainly due to their<br/>production processes. Considering the cost factor, we need to work on reducing the cost of<br/>composite materials without altering their other properties mainly their strength. Composite<br/>materials are known for their excellent stiffness to weight ratio and strength to weight ratio. The<br/>most known composite materials are fiberglass, Kevlar, carbon fiber and basalt fiber. Carbon fiber<br/>is the most widely used composite material since it has a high strength.<br/>The drop test impact is a very short duration phenomenon with impact time being less than<br/>20milliseconds. The material for the target point and its geometry plays a very important role in<br/>the phenomenon followed by certain boundary conditions. The impactor possesses gravitational<br/>potential energy and on striking that energy is absorbed by the targeted patch. The impactor with<br/>Gravitational Potential Energy less than the energy absorbing capability of the composite material<br/>only damages the composite patch in terms of cracks, some indentation or delamination of the<br/>composite patch layers. But if the Gravitational Potential Energy is greater than the energy<br/>absorbing capability of the composite material, the impactor will penetrate through the composite<br/>material leaving a hole. Hence the amount or intensity of the damage in composite patch is directly<br/>related to the energy absorbing ability of the composite patch.<br/>In current study, the behavior of three different combinations composed of basalt fiber and flax<br/>fiber were studied. The 3 combinations include BF4B11, BFB5FB5FB, B5F3B5 (Asymmetric,<br/>symmetric and sandwich) respectively. The test specimen was composed of Aluminum 2024 of<br/>thickness 3mm bonded with one of the circular shaped composite patch of thickness 3mm. Single<br/>impact strikes were carried out on the targeted composite patch at certain energies with aluminium<br/>plate acting as back plate. The numerical results along with graphs were taken from the software<br/>followed by the results gathered through studying damage caused due to indentation and by<br/>investigating the propagation of cracks formed. All of these results of the 3 combinations were<br/>thoroughly checked and a comparison between the 3 combinations was carried out involving the<br/>amount of indentation, force displacement, bending stiffness, damage area and cracks propagation.<br/>It was found that among the 3 configuration layups Asymmetric performed better than symmetric<br/>and sandwich layups. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name entry element | MS Mechanical Engineering |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Supervisor : Dr. Aamir Mubashar |
| 856 ## - ELECTRONIC LOCATION AND ACCESS | |
| Uniform Resource Identifier | <a href="http://10.250.8.41:8080/xmlui/handle/123456789/35752">http://10.250.8.41:8080/xmlui/handle/123456789/35752</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 | 12/12/2023 | 621 | SMME-TH-892 | Thesis |