Determination of Fatigue Crack Propagation Rate by Two Methods

Abstract In the paper are present a practical procedure involving the determination of crack propagation rate using da/dN software. The procedure of the tests, the presentation of the da/dN software and its operation, the hypothesis and the conditions of the experiment and the results obtained from the experiment were presented. The determination of the yield strength and elastic characteristics was used, in which the steps for carrying out an experiment in the laboratory were explained. This was carried out by choosing the materials, presenting the apparatus and the specimen to be analyzed, and the results obtained from the experiment. It should be mentioned that da/dN software was used to obtain the results. The paper illustrates the dependencies between crack growth and the number of loading cycles, demonstrated by two experimental methods. The theoretical part underlying the two experimental methods, the calculation relations used, the importance and role of the da/dN software in their realization are discussed, and the conclusions of the study are presented at the end.