The residual stress is formed in \(\hbox {YBa}_{\mathrm {2}}\hbox {Cu}_{\mathrm {3}}\hbox {O}_{{7\text {-}\updelta }}\) (YBCO) bulk superconductors, which undergoes a complex fabrication process and experienced a huge temperature change about \(1000^{\circ }\,\hbox {C}\). The residual stress may result in micro-cracks in YBCO bulks and cause degradation of its superconducting and mechanical properties. It will be greatly helpful to reform the structural designs if the distribution of residual stress in YBCO bulk can be investigated. The traditional method of measuring residual stress does not apply to oxide ceramics as they are brittle materials. In this paper, a YBCO bulk was sliced into pieces of several millimeters in height, which could thus be treated as a plane-stress problem. The residual stress and principal stress angle for YBCO bulk have been obtained by an artificial hole-drilling method with very low speed.

残余应力在\（\ hbox {YBa} _ {\ mathrm {2}} \ hbox {Cu} _ {\ mathrm {3}} \ hbox {O} _ {{7 \ text {-} \ updelta }} \）（YBCO）大块超导体，它经历了复杂的制造过程，并且经历了大约\（1000 ^ {\ circ} \，\ hbox {C} \）的巨大温度变化。残余应力可能会导致YBCO块中出现微裂纹，并导致其超导和机械性能下降。如果能够研究YBCO大块中的残余应力分布，将对结构设计的改革大有帮助。测量残余应力的传统方法不适用于氧化物陶瓷，因为它们是脆性材料。在本文中，将YBCO块切成几毫米高的碎片，因此可以将其视为平面应力问题。YBCO块的残余应力和主应力角是通过人工钻孔方法以非常低的速度获得的。