**3. Conclusions**

In the literature, studies related to FGM have mostly focused on determining FGMs' thermal properties using experimental, analytical, and numerical methods. FGMs' fatigue and fatigue fracture behaviors have been tested using numerical and analytical methods and improved new approaches are developed to date. However, there are hardly enough experimental studies to support this.

In conjunction with this study, mechanical properties and fatigue crack propagation behavior were analyzed experimentally. The results can be summarized as follows:


**5.** *p* < 1 seems to be more advantageous than *p* > 1 condition after crack propagation experiments of FGM when crack propagation starts from single-edge notched (SE(T)) aluminum-rich side considering the gradient exponent.
