JavaScript is disabled for your browser. Some features of this site may not work without it.
| dc.contributor.author | ADDISU, DERSO ASEMIE | |
| dc.date.accessioned | 2021-10-19T11:45:20Z | |
| dc.date.available | 2021-10-19T11:45:20Z | |
| dc.date.issued | 2020-09 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/12805 | |
| dc.description.abstract | The most well-known aramid fiber is Kevlar, the lightest of any fiber reinforcement has high tensile strength for its weight, and is very tough. It is slightly less expensive than carbon fiber. And Kevlar/epoxy composite is a promising material for impact resistance. The numerical investigation has been carried out to study the behavior of Kevlar/epoxy composite plate subjected to ballistic impact using Ansys/Explicit. Numerical parametric studies of the ballistic impact were undertaken for obtaining the optimal number of plies or the thickness of the plate specimen. The total deformations of the 36 impacted samples are presented in results and discussions part, some of them are penetrated and others are not penetrated but only having deformations that were acceptable by the national institute of justice (NIJ) standard. The best volume fraction to get optimum impact strength of the laminate is 65% to 35% in volume for fiber and matrix respectively at 0/90-degree yarn arrangements. Modeling and Simulations were done using ANSYS 2019 R-3 finite element analysis software and impacted at a maximum velocity of 720 m/s. The deformation results were penetrations, deformations above the accepted standard, and acceptable deformations by the standard. The minimum number of plies to stop an Ak-47 bullet with accepted deformation range were 22 plies which were found on the analytical calculation and 26 plies on finite element simulation experiments. The detailed results for each sample and projectile are presented in the document. For the second part of the work which is a stab resistance composite plate, the tightness of the woven fabric in the composite ballistic fabrics also significantly reduces the back-face deformations caused by the spike or knife impact. These findings designate the viability of achieving better protective panels with lower weights and less bulkiness when Kevlar fiber plates are used against the stabbing impact. As it was seen on the results a tightly woven fabric can be used for armor plates to withstand both ballistic and stabbing assaults. | en_US |
| dc.language.iso | en_US | en_US |
| dc.subject | MECHANICAL AND INDUSTRIAL ENGINEERING | en_US |
| dc.title | ANALYSIS OF KEVLAR/EPOXY COMPOSITE PLATE SUBJECTED TO BALLISTIC IMPACT FOR BODY ARMOR | en_US |
| dc.type | Thesis | en_US |
