20.500.12556/DKUM-93579 Determination of fracture toughness and resistance curves by three methods on armoured steel Parameters of EPFM are used as relevant parameters in structural integrity assessments. In this research, the fracture toughness of armoured steel was determined. The resulting resistance curves and KJIC obtained according to the ASTM E1820 standard with normalization, compliance and multi-specimen methods were compared. Also, the KIC was verified according to the ASTM E399 standard as the most precise method for obtaining the KIC, which also requires a lot of knowledge. For the experiment, the multi-specimen method was used, which is the most expensive and most accurate method, where the least assumption and crack size is measured on the specimen. A fractographic analysis was also presented, and this heat-treated high-strength steel, which is used for anti-ballistic protection, was fully characterized. Protac 500 fracture mechanics KJIC resistant curves mehanika loma upor krivulje true false true MDPI Angleški jezik Slovenski jezik https://www.mdpi.com/journal/jmmp Članek v reviji 2025-07-03 10:09:11 2025-07-03 10:09:11 2026-05-14 07:34:31 0000-00-00 00:00:00 2025 0 0 24 str. [iss.] 7, [article no.] 212 [Vol.] 9 June 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2025-05-12 2025-06-18 2025-06-24 539.3 241213443 10.3390/jmmp9070212 2504-4494 jmmp-09-00212-v2.pdf jmmp-09-00212-v2.pdf 1 982FA0414618987EF28488279C513269 2303f6606e2e4d9c049da3e679fd76a8b16b1caf080a7cea7ec6b8fa11175804 58abf511-57e5-11f0-95d1-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=193206 https://www.mdpi.com/2504-4494/9/7/212 0 5dd3ebee-57e5-11f0-95d1-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=193207 Fakulteta za strojništvo 0 0 0