Bending strength, fracture toughness, and elastic modulus data have been acquired for YBa_2Cu_3O_x, Bi_2Sr_2CaCu_2O_x, (Bi, Pb)_2Sr_2Ca_2Cu_2O_x, and TlBa_2Ca_2Cu_3O_x bulk specimens. These data strongly suggest that the maximum possible tensile strain without fracture of bulk compacts, tapes, or wires is approx approx 0.2
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