Identification of the Cause of Damage to the Firefighter Ladder

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00007064:K02__/20:N0000103 RIV/60461373:22310/20:43920856

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

Identification of the Cause of Damage to the Firefighter Ladder

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

Identification of the Cause of Damage to the Firefighter Ladder

Popis výsledku anglicky

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.

Druh

J_SC - Článek v periodiku v databázi SCOPUS

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/VI20162020021" target="_blank" >VI20162020021: Zvýšení bezpečnosti zásahových žebříků pro hasiče</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Manufacturing Technology

ISSN

1213-2489

e-ISSN

—

Svazek periodika

20

Číslo periodika v rámci svazku

4

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

7

Strana od-do

500-506

Kód UT WoS článku

—

EID výsledku v databázi Scopus

2-s2.0-85098732288