Ii. Akimov et al., THE EFFECT OF BENDING RADIUS ON V-I CHARACTERISTICS OF MONOCORED AND MULTICORED BIPB-2223 TAPES WITH AND WITHOUT AG ADDITIONS, IEEE transactions on applied superconductivity, 7(2), 1997, pp. 1323-1326
The effect of bending strain on Voltage-Current Characteristics (VCC)
of BiPbSrCaCuO-2223/(Ag and Ag-alloy sheathed) tapes with and without
Ag additions into the core have been studied. The testing probe allows
us to carry out all set of bending tests up to radius 5 mm on the sam
e specimen. The critical current Ic and shape of high-sensitivity VCC
as a function of bending strain are analysed. Degradation of current c
arrying capacity under bending deformation is caused by the formation
of microcracks. The overlapping of microcracks in Bi-2223/Ag sheathed
tapes without Ag additions leads to current overflow into the Ag sheat
h and to appearance of linear resistance segment in the V-I curve at l
ow electric field.