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To a large extent,the reliability of nuclear structures depends on the mechanical properties of the constituent materials which work at elevated temperatures under a high radiation environment.Usually,the mechanical properties of these materials are characterized by ex-core tensile tests with samples irradiated for a period of time in some irradiation facilities before conducting the tests.With the same advantages as the conventional tensile tests,the ex-core tests have yielded many valuable data on the basic mechanical properties of nuclear materials.However,the cost of performing the ex-core tests is high considering the difficulty of preparing the samples and the high requirement for radiation shielding.Furthermore,inhomogeneous structures(for example,welds)and thin-walled structures(for example,fuel cladding)poses even greater difficulties to the conventional test techniques.