Abstract In many structural assembly, the main cause of nonlinearities are jointed interfaces. The nonlinearity manifests as a softening response, which is caused by the joint slipping when stick caused by friction forces is overcome. To quantify the friction nonlinearity, the system is typically experimentally tested in each axis independently. This practice assumes that the nonlinearity is directionally uncoupled and can be modeled using the superposition principle. Previous works have shown this is an incorrect assumption. Joints in structural assemblies may not experience excitation from only one direction at a time. This paper experimentally assesses the slip condition of the removable component of the Box Assembly with Removable Component benchmark structure. The slip condition is first studied using single-axis excitation and superposition assumption, and then studies the slip condition under multi-axis excitation. The results show that the slip condition changes when the structure is excited using multi-directional excitation.


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