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Vpliv nelinearnosti obremenjevanja na rekonstrukcijo napetostnega stanja
ID Lenič, Jošt (Author), ID Starman, Bojan (Mentor) More about this mentor... This link opens in a new window, ID Halilovič, Miroslav (Comentor)

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Abstract
Pri rekonstrukciji napetostnega stanja iz znanega polja deformacij se pri računskem času implicitnega algoritma močno pozna število uporabljenih slik zato je potrebno zmanjšati število slik vzorca, da rezultate dobimo v smiselnih računskih časih. Pri eksplicitnem NICE algoritmu to ni potrebno, ker je računski čas skoraj neodvisen od števila slik pri tem pa se natančnost izračunov ohranja. To pokažemo v zaključni nalogi z različnimi načini obremenjevanja vzorca. Poleg te primerjave pokažemo tudi, da prehod v plastično območje materiala pri obremenjevanju po različnih poteh povzroči razlike v končnih napetostih kljub enakim deformacijam.

Language:Slovenian
Keywords:rekonstrukcija napetosti, metoda korelacije digitalnih slik, deformacijski gradient, Abaqus, računski čas
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:FS - Faculty of Mechanical Engineering
Year:2025
Number of pages:XII, 28 f.
PID:20.500.12556/RUL-169338 This link opens in a new window
UDC:620.172.21:004.421.2:004.932(043.2)
COBISS.SI-ID:240353539 This link opens in a new window
Publication date in RUL:24.05.2025
Views:507
Downloads:183
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Secondary language

Language:English
Title:The influence of nonlinear loading on stress reconstruction
Abstract:
When reconstructing the stress state from a known strain field, the number of frames used significantly affects the computation time of implicit IRMA algorithm. Therefore, down-sampling is necessary to obtain results within a reasonable time-scale. In contrast, the NICE algorithm does not require this, as its computation time is almost independent of the number of frames while maintaining accuracy. In the thesis, We demonstrate this by using different sample loading conditions. In addition to this comparison, we also show that equal plastic strains during different loading paths cause differences in the final stresses despite strains being identical.

Keywords:stress reconstruction, digital image correlation, deformation gradient, Abaqus, computational time

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