Abstract: Periodic structures present wave phenomena that can be used as wave attenuation in certain frequency bands. Usually, the periodic structures are divided into metamaterials (locally resonant structures) and phononic crystals. More recently, topological metamaterials have emerged as a possible application to overcome conventional metamaterials and phononic crystals. These structures can support interface states by combining two periodic structures with distinct topological invariants. The wave propagation path (or localization) is robust against variability and defects, which is the so-called topological protection. In the current study, we investigate the robustness of interface topological modes in a rod structure and show that this robustness has different effects on the mode shapes and the natural frequency of the topological and defect modes Ver menos