In order to determine the K-value of the complex cracked bodies within the accuracy of practical use, a new experimental method was proposed based on the brittle fracturing of epoxy resin. By comparing the experimentally determined K-value of a standard specimen with the calculated value, the accuracy of the proposed method was first checked. Then, the K-value determination tests of a specimen with cracks of different length in both sides of the specimen surface and a specimen having a semicircular part-through crack were carried out. Through the experiments, it is shown that the proposed method is practical and useful in determining the K-value of the cracked bodies.
