Publication
Hypervelocity impacts against concrete mixed with ceramic spheres
| datacite.subject.fos | Engenharia e Tecnologia::Engenharia Eletrotécnica, Eletrónica e Informática | |
| dc.contributor.advisor | Rebelo , Hugo Miguel Bento | |
| dc.contributor.advisor | Lecompte, David | |
| dc.contributor.author | Elias, Teotónio Póvoa Rodrigues | |
| dc.date.accessioned | 2025-11-17T14:43:11Z | |
| dc.date.available | 2025-11-17T14:43:11Z | |
| dc.date.issued | 2024-10-02 | |
| dc.description.abstract | Extreme events, whether natural occurring or manmade can have catastrophic consequences, endangering people. Given the current geopolitical situation, there is a need to better protect structures against these threats, minimizing damage to critical infrastructure and safeguarding human lives. Due to this necessity, the Research, Development, and Innovation Centre of the Military Academy (CINAMIL) funded the “Protection of Infrastructures Subjected to Extreme Actions“ (PrISAEx) project, from the Centre of Competence for Infrastructure Protection (CCPI), to better understand this phenomena typology and to study ways to mitigate its effects. Within extreme events, hypervelocity impacts (speeds greater than 2000 m/s or 3000 m/s) must be considered. Therefore, this dissertation will study the behaviour of concrete when faced with hypervelocity impacts, with the goals of evaluating the protective capabilities of concrete structures with the addition of 3 layers of ceramic spheres. The hypervelocity will be achieved using a shaped charge inspired by the PG-7VM warhead, launched by the RPG-7. For this purpose, LS-DYNA was used to create axisymmetric numerical models of the shaped charge impacting plain concrete targets, as well as concrete targets with the added ceramic spheres. These models were validated with an experimental campaign where the achieved penetration, affected diameter, entry diameter and loss of volume of the different targets were analysed. Furthermore, it was possible to retrieve liners after opening the targets, which provided additional data regarding the loss of their mass. For the experimental campaign, 3 types of targets were used: S type targets, filled with plain concrete; E type targets were filled with concrete with 3 layers of ceramic spheres and NN targets have the same composition as E targets with the addition of a non-Newtonian fluid, filling the gaps between the spheres. With the experimental campaign, it was found that the addition of the spheres resulted in decreasing penetration on target by 0,38% and that combining spheres and non-Newtonian fluid caused a 20% reduction in penetration. Furthermore, it was possible to verify that the available analytical penetration models significantly overestimate penetrations, which makes sense considering the difficulties in translating the behaviour of a brittle and non-homogeneous material. | por |
| dc.identifier.tid | 204003202 | |
| dc.identifier.uri | http://hdl.handle.net/10400.26/59821 | |
| dc.language.iso | eng | |
| dc.rights.uri | N/A | |
| dc.subject | : Shaped charge | |
| dc.subject | Hypervelocity | |
| dc.subject | Numerical simulation | |
| dc.subject | Ceramic spheres. | |
| dc.title | Hypervelocity impacts against concrete mixed with ceramic spheres | por |
| dc.type | master thesis | |
| dspace.entity.type | Publication | |
| thesis.degree.grantor | Academia Militar | |
| thesis.degree.name | Mestrado em Engenharia Electrónica |
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