Parameters' confidence intervals evaluation for heterogeneous strain field specimen designs by using digital image correlation

Maček, Andraž (avtor), Urevc, Janez (avtor), Starman, Bojan (avtor), Halilovič, Miroslav (avtor)

This paper aims to compare different heterogeneous test designs from the perspective of the confidence interval quantification of inversely identified parameters, where the influence of a DIC optical system systematic and random error are taken into account. Because the errors in optical measurement can arise from many reasons and sources, our methodology relies on the system's errors determined from initial sets of pictures acquired at the load-free state for hundreds of specimens (over 850 tests over the past three years). In this way, a prior probability distribution of systematic and random error, arisen from the system initial settings and testing procedures are determined. Further, by conducting an inverse identification procedure of linear orthotropic elastic material parameters, the influence of the error distributions is studied for different types of heterogeneous specimens. The presented methodology determines the DIC bias and random error propagation through the inverse identification procedure to individual parameters. For each specimen design, confidence intervals of identified material parameters were determined. The results show the appropriateness of a specimen design for the identification of particular material parameters.

• Jezik: Slovenski jezik
• Ključne besede: heterogeneous test, digital image correlation, full-field measurements, confidence intervals, mechanical testing
• Tipologija: 1.08 - Objavljeni znanstveni prispevek na konferenci
• Organizacija: FS - Fakulteta za strojništvo
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Datum objave: 29.03.2021
• Leto izida: 2021
• Št. strani: Str. 1-8
• Številčenje: art. 2415
• PID: 20.500.12556/RUL-126858
• Datum objave v RUL: 06.05.2021

Gradivo je del zbornika

• Naslov: ESAFORM 2021
• Prireditelj konference: University of Liège, Belgium

Licence

• Licenca: CC BY 4.0, Creative Commons Priznanje avtorstva 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by/4.0/deed.sl
• Opis: To je standardna licenca Creative Commons, ki daje uporabnikom največ možnosti za nadaljnjo uporabo dela, pri čemer morajo navesti avtorja.
• Začetek licenciranja: 29.03.2021

Sekundarni jezik

• Jezik: Angleški jezik
• Ključne besede: heterogeni test, korelacija digitalne slike, meritve v polnem polju, interval zaupanja, mehansko testiranje

Projekti

• Financer: ARRS - Agencija za raziskovalno dejavnost Republike Slovenije
• Številka projekta: P2-0263
• Naslov: Mehanika v tehniki