Naslov
Comparison of simple and full approach for non- associated formulation based on Karafillis- Boyce stress function

Autori
Cvitanić, Vedrana ; Džoja, Maja

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
5th International Conference on Smart and Sustainable Technologies / - Split, 2020

ISBN
978-953-290-100-9

Skup
5th International Conference on Smart and Sustainable Technologies (SpliTech 2020)

Mjesto i datum
Split, Hrvatska, 23.09.2020. - 26.09.2020

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
equivalent plastic strain ; non-associated flow rule ; Karafillis-Boyce stress function ; cylindrical cup deep drawing ; sheet metals

Sažetak
In the present paper an orthotropic elasto- plastic constitutive formulation for sheet metals is analyzed. The formulation is based on the non-associated flow rule, the isotropic hardening concept and utilizes orthotropic four parametric Karafillis-Boyce stress function as yield function/plastic potential. In defining the evolution equation for the equivalent plastic strain, as hardening parameter, two approaches are considered. By full approach, the equivalent plastic strain increment is proportional to the ratio of plastic potential and yield function where the plastic multiplier is proportionality factor. By simple approach, the equivalent plastic strain increment corresponds to the plastic multiplier. For considered constitutive descriptions, algorithmic formulations, based on the implicit return mapping, are developed and analyzed in predicting simple deformation tests and the cylindrical cup deep drawing process for AA5754-H22 sheet sample. Influence of the equivalent plastic strain evolution equation on the model predictions is assessed.

Izvorni jezik
Engleski

Znanstvena područja
Strojarstvo, Temeljne tehničke znanosti

Napomena
IEEE CatalogNumber: CFP19F09-USB

POVEZANOST RADA