<p>Accurate modeling of contact-impact phenomena in revolute clearance joints remains a critical challenge in multibody dynamics. This study investigates the frictionless contact dynamics of deformable revolute clearance joints using a mortar-based augmented Lagrangian formulation within the framework of isogeometric analysis. The presented approach effectively addresses key limitations of traditional methods, particularly over-constraining effects and inaccuracies of penalty-based and Hertzian contact models, especially in small-clearance regimes. This method achieves high precision in capturing contact pressure distributions, which is crucial for investigations into lubrication, wear, and other tribological phenomena. Furthermore, a comprehensive parametric study is conducted to assess the influence of clearance size on the dynamic response of the joint, offering valuable insights into its behavior under varying conditions.</p>