In this paper,the problem of critical load in rock KIC measurement has been studied with theory and experiment, and as a result of the maximum load is critical load.

• 本文对岩石KIC测试中的临界载荷问题从理论上和实验上进行了研究；并得出最大载荷就是其临界载荷的结论；该结论将有助于对岩石的断裂过程的认识.