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对Ｊ等效原理能否用于延性材料缺陷评定作了研讨和计算。算例说明，按该原理求出的失稳点参量（△α，σ）比按 ＥＰＲＩ方法求出的要大些，对应的Ｊ值相差就更大，且这种差别随硬化指数ｎ上升增加很快。这将使断裂设计偏于危险，表明不宜把Ｊ等效原理作为通用方法用于延性材料的缺陷评定．仍有必要继续探求理论完善、方法简便且全面考虑各种实际工程因素的评定方法。
The study and calculation of the J equivalent principle can be used to evaluate the defects of ductile materials. The example shows that the instability point parameters (△α, σ) obtained by this principle are larger than that obtained by the EPRI method, and the corresponding J value is more different, and the difference increases with the hardening index n. quickly. This will make the fracture design dangerous, indicating that J is not suitable as a general method for the assessment of defects in ductile materials. It is still necessary to continue to explore methods for assessing the theory, improving the method, and simply considering various actual engineering factors.