Evaluation of Fracture Toughness of Composite Armor Substructures
The fracture toughness of a series of passive armor candidate substructures has been evaluated using impact testing with special reference to interleaving viscoelastic layers fabricated in-house. A segmented polyurethane (PU) elastomer, its cross-linked counterpart and its glass fiber composite, two...
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| Format: | Article |
| Language: | English |
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National University of Sciences and Technology, Islamabad
2008-12-01
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| Series: | NUST Journal of Engineering Sciences |
| Online Access: | https://journals.nust.edu.pk/index.php/njes/article/view/30 |
| _version_ | 1797854223446048768 |
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| author | M. Bilal Khan |
| author_facet | M. Bilal Khan |
| author_sort | M. Bilal Khan |
| collection | DOAJ |
| description | The fracture toughness of a series of passive armor candidate substructures has been evaluated using impact testing with special reference to interleaving viscoelastic layers fabricated in-house. A segmented polyurethane (PU) elastomer, its cross-linked counterpart and its glass fiber composite, two forms of granite, Mn-steel and the titanium (Ti) alloy, Ti-6Al-4V were tested. The PU composite exhibited the highest impact strength (IS) followed by Ti-alloy, which showed intercrystalline, cup and cone fracture typical of highly ductile materials. Viscoelastic PU exhibited maximum energy absorption without being fractured. When used in conjunction with ductile materials, the PU augments the IS, but not so well in league with the brittle ones. The significant superior energy absorption by PU is analyzed and explained in terms of the nanostructures, attenuated total reflection infrared spectroscopy (AlR-IR) and dynamic mechanical thermal analysis (DMTA) of the polymer.
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| first_indexed | 2024-04-09T20:02:23Z |
| format | Article |
| id | doaj.art-b8958acb87794a21a17415b197626c47 |
| institution | Directory Open Access Journal |
| issn | 2070-9900 2411-6319 |
| language | English |
| last_indexed | 2024-04-09T20:02:23Z |
| publishDate | 2008-12-01 |
| publisher | National University of Sciences and Technology, Islamabad |
| record_format | Article |
| series | NUST Journal of Engineering Sciences |
| spelling | doaj.art-b8958acb87794a21a17415b197626c472023-04-02T23:24:35ZengNational University of Sciences and Technology, IslamabadNUST Journal of Engineering Sciences2070-99002411-63192008-12-011110.24949/njes.v1i1.30Evaluation of Fracture Toughness of Composite Armor SubstructuresM. Bilal KhanThe fracture toughness of a series of passive armor candidate substructures has been evaluated using impact testing with special reference to interleaving viscoelastic layers fabricated in-house. A segmented polyurethane (PU) elastomer, its cross-linked counterpart and its glass fiber composite, two forms of granite, Mn-steel and the titanium (Ti) alloy, Ti-6Al-4V were tested. The PU composite exhibited the highest impact strength (IS) followed by Ti-alloy, which showed intercrystalline, cup and cone fracture typical of highly ductile materials. Viscoelastic PU exhibited maximum energy absorption without being fractured. When used in conjunction with ductile materials, the PU augments the IS, but not so well in league with the brittle ones. The significant superior energy absorption by PU is analyzed and explained in terms of the nanostructures, attenuated total reflection infrared spectroscopy (AlR-IR) and dynamic mechanical thermal analysis (DMTA) of the polymer. https://journals.nust.edu.pk/index.php/njes/article/view/30 |
| spellingShingle | M. Bilal Khan Evaluation of Fracture Toughness of Composite Armor Substructures NUST Journal of Engineering Sciences |
| title | Evaluation of Fracture Toughness of Composite Armor Substructures |
| title_full | Evaluation of Fracture Toughness of Composite Armor Substructures |
| title_fullStr | Evaluation of Fracture Toughness of Composite Armor Substructures |
| title_full_unstemmed | Evaluation of Fracture Toughness of Composite Armor Substructures |
| title_short | Evaluation of Fracture Toughness of Composite Armor Substructures |
| title_sort | evaluation of fracture toughness of composite armor substructures |
| url | https://journals.nust.edu.pk/index.php/njes/article/view/30 |
| work_keys_str_mv | AT mbilalkhan evaluationoffracturetoughnessofcompositearmorsubstructures |