Comparison of the strain-hardening parameters of sheet metals in uniaxial and biaxial tension

Strain rate dependent tensile behavior of advanced high strength steels: Experiment and constitutive modeling

“…This method is similar to the Lin-Wagoner model [14], where strain hardening parameter in a saturation type law varies linearly as a function of temperature. Usually, the constitutive models were combined multiplicatively considering the particular strain hardening part, the strain rate sensitivity part and temperature dependent part [15][16][17][18][19][20]. Although there are variety of constitutive models describing the plastic flow with strain rate sensitivity, the basis hardening models can be classified into two main types; i.e., saturation type like Voce hardening model or power-law type like Hollomon hardening model.…”

A comparison on failure pressures of cylindrical pressure vessels

“…The solutions presented are used to compare the failure pressures copper and brass cylindrical vessels. As reported previously in Kleemola and Ranta-Eskola (1976) and Sing and Rao (1997), brass is well represented by use of the Voce hardening law. Therefore, the present comparative study may provide useful and reliable information for structural designers and engineers.…”

“…For copper A, B, n o and R are taken (Kleemola and Ranta-Eskola, 1976) to be 91 MPa, 376 MPa, 4.71 and 0.86, respectively. For brass A, B, n o and R are taken (Kleemola and Ranta-Eskola, 1976) to be 105 MPa, 732 MPa, 2.36 and 0.81, respectively. The stress-strain curves of copper and brass generated by the given coefficients and Voce equation is shown in Fig.…”

“…However, as reported previously (Kleemola and Ranta-Eskola, 1976;Sing and Rao, 1997), the stress-strain relationship of copper and, especially, brass can be represented using the Voce relationship as…”

Sheet-metal forming

“…In the above it has been assumed that at large plastic strains the work-hardening characteristic can be fitted by the empirical relation a == KEn, Kleemola et ale 40,41 have shown that this is justified for low-carbon steel but not for copper and brass, and they propose that the Voce equation, (1) and (6), give greater correspondence between simple tension and plane-strain tension. This test provides an excellent method of checking yield functions under biaxial tension.…”