We report new results on a dynamical model of serrated yielding. These
essentially pertain to the full spectrum of Lyapunov exponents of the
non-linear (chaotic) model and fractal characterization of the associ
ated strange attractor. The power spectrum of scalar time series extra
cted from the phase space trajectories decays exponentially with incre
ase of frequency and the decay constant is found proportional to the K
olmogorov-Sinai entropy.