Mechanical properties of EuBaCuO superconducting bulk material at liquid nitrogen temperature

Abstract

In order to understand the mechanical properties of EuBa2Cu3Oy “EuBaCuO” superconducting bulk material, 3- and 4-point bending tests were carried out at room and liquid nitrogen temperature (77.3 K) for specimens cut from a EuBaCuO single-grain bulk material. The Young’s modulus evaluated through the 3- point bending test and that through the 4-point bending test were similar to each other. On the other hand, the 3-point bending strength was higher than the 4-point bending strength, which is due to the smaller maximum bending moment area of the specimen in the 3-point bending test. The Young’s modulus at liquid nitrogen temperature was higher than that at room temperature (RT), which is due to the decrease of the interatomic distance by cooling. The bending strength at 77 K was also higher than that at RT. These mechanical property data of the EuBaCuO bulk material were comparable to those of other REBa2Cu3Oy “REBaCuO” bulk materials (RE: rare-earth elements).