PT  - JOURNAL ARTICLE
AU  - Stachowicz, Feliks
TI  - Instantaneous Plastic Flow Properties of Thin Brass Sheets Under Uniaxial and Biaxial Testing
DP  - 2011 Mar 31
TA  - Acta Mechanica Slovaca
PG  - 22--27
VI  - 15
IP  - 1
AID - 10.21496/ams.2011.003
IS  - 13352393
AB  - In the prediction of formability of sheet metals, it is necessary to determine material properties which are normally evaluated on the data obtained by performing simple tests. The most important parameters affecting the value of limit strains of a sheet metal are the strain hardening exponent (n) and plastic anisotropy ratio (r). It was established that especially the value of n-parameter of brass sheets strongly depend on the specimen elongation and stress/strain state. The effect of instantaneous (differential) nt - value and rt - value on the forming limit curve was computed theoretically.