  In the present paper, a fiber bundle model in (1+1)-dimensions that simulates
the rupture process of a fibrous material pulled by an uniaxial force F is
analyzed. In this model the load of a broken fiber is shifted in equal portions
onto the nearest unbroken fibers. The force-displacement diagram is obtained
for several traction velocities v and temperatures t. Also, it is shown how the
fracture toughness $K_c$ changes with the traction velocity v and with the
temperature t. In this paper it is shown that the rupture process is strongly
dependent on temperature t and on velocity v.
