EXPERIMENTAL STUDIES, MODELING AND SIMULATION OF THE HYSTERESIS IN SMA SINGLE-CRYSTALS - THE SIGMA-COORDINATE, EPSILON-COORDINATE, T-COORDINATE AND T-COORDINATE SPACE

The behaviour of global and partial loops (stress-strain-temperature) in SMA single crystals was investigated. Marquardt's based numeric alg orithms were developed for the identification of relevant physical par ameters (time independent). In addition, the time-dependent effects li ke static and dynamic recoverable creep, beta-recovery, quenching and of up-quenching effects were evaluated. The constructed model permits the computer simulation of the global and partial hysteresis cycles in the four dimensional sigma, epsilon, T and t coordinate space. The si mulated curves are in excellent agreement with the experimental result s.