Identification of the Cause of Damage to the Firefighter Ladder

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F20%3A00349622" target="_blank" >RIV/68407700:21220/20:00349622 - isvavai.cz</a>
Alternative codes found
RIV/00007064:K02__/20:N0000103 RIV/60461373:22310/20:43920856
Result on the web
<a href="https://doi.org/10.21062/mft.2020.068" target="_blank" >https://doi.org/10.21062/mft.2020.068</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.21062/mft.2020.068" target="_blank" >10.21062/mft.2020.068</a>

Result language
angličtina
Original language name
Identification of the Cause of Damage to the Firefighter Ladder
Original language description
Two extendable firefighter ladders, both made of AA 6063 alloy, has been destructively tested accordingly to the ČSN EN ISO 1147 to determine the maximal load before their failure. For this purpose, two brand new ladders with a complex profile were compared to the 5-year old one with a far simpler profile. It was found, that the new ladder broke already at a load of 366 (365 kg) while the 5-year old ladder couldwithstand a much higher load of 426 kg. Since both the ladders broke nearby the guides acting as a mechanical support for their extension, it was of high interest to investigate the cause of different behaviour. Considering the fact, that the brand new ladder had a much more complex profile of the beam and the fact, that the guides were welded to the beams, it was of high importance to investigate the influence of the weld on the overall integrity of the ladder. It was found, that the weld itself deteriorated the mechanical properties of the beam reaching the minimal hardness in the distance of 10 mm, which also corresponded with the crack initiation site. This place also showed the lowest hardness reaching only 52 HV 1.
Czech name
—
Czech description
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Type
J<sub>SC</sub> - Article in a specialist periodical, which is included in the SCOPUS database
CEP classification
—
OECD FORD branch
20501 - Materials engineering

Project
<a href="/en/project/VI20162020021" target="_blank" >VI20162020021: Safety improvement of extension ladders for firefighters</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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