The influence of bending strain on the transport E-J characteristics in Bi-
2223 Ag/AgMg-alloy sheathed tape is studied by using the percolation model.
Magnetic field- and temperature-dependent E-J characteristics in the tape
have been measured at various conditions of bending strain. As the bending
radius is reduced, the apparent critical current in the tape is reduced mai
nly because of the reduction of geometrical cross-section area due to crack
ing. However, if we extract the local current density taking into account t
he cracking, it can be seen that the value of critical current density, J(c
), is enlarged due to the bending strain in the remained region. Namely, th
e pinning strength in the remained region is enlarged as the bending strain
is increased. It will be shown that the present method allows us to separa
te the variation of the connectivity and the pinning strength originated fr
om the strain. (C) 2001 Elsevier Science B.V. All rights reserved.