The static metallic joints' sealing performance is deeply impacted by the plastic deformation and the interfacial separation of the contact surfaces with self-affine roughness. The yield hardening effect, unavoidable at the contact interface, is of vital importance to the plastic deformation and the distribution of the interfacial separation. However, most of the previous research ignores the effect of the yield hardening, assuming that the contact surfaces are elastic-perfectly plastic. To address the problem, a novel analytic model for investigating the sealing performance under the effect of yield hardening has been developed in this paper. Utilizing the measured data of contact surfaces as input, the corresponding leakage rates are calculated. Besides, the contact stress distribution as well as the real contact area at the interface are also discussed. The sealing experiments are carried out accordingly, verifying that the proposed model owns the ability to predict the leakage rate under the effect of yield hardening.
The static metallic joints’ sealing performance is deeply impacted by the plastic deformation and the interfacial separation of the contact surfaces with self-affine roughness. The yield hardening effect, unavoidable at the contact interface, is of vital importance to the plastic deformation and the distribution of the interfacial separation. However, most of the previous research ignores the effect of the yield hardening, assuming that the contact surfaces are elastic-perfectly plastic. To address the problem, a novel analytic model for investigating the sealing performance under the effect of yield hardening has been developed in this paper. Utilizing the measured data of contact surfaces as input, the corresponding leakage rates are calculated. Besides, the contact stress distribution as well as the real contact area at the interface are also discussed. The sealing experiments are carried out accordingly, verifying that the proposed model owns the ability to predict the leakage rate under the effect of yield hardening.
The sealing performance of a hydraulic system is determined by the joint’s interfacial contact status, which is impacted by unavoidable assembly errors and joint manufacturing deviations on multiple scales. A novel geometric analysis model was heuristically developed for incorporating the macroscopic and mesoscopic topographies into the accurate estimation of the contact surfaces' initial relative assembly position. The microscopic contact model is subsequently constructed using the reverse reconstruction method based on the measured characteristics of rough surfaces. In conjunction with the relative contact position, a multiscale finite element contact model of the interface in the assembly was generated. The simulated indentation results are then compared to experimental data for selected typical circumferential angles, while the impact of topography at each scale is investigated. The findings show the variation in the seal formation tendencies and illustrate how effectively the model can predict the contact status at the seal ring. The influence of the macroscopic mating angle is mostly apparent in the distribution of plastic deformation along the circumferential direction. The mesoscopic flare angle is mostly reflected in the width and depth of the interfacial depression, and the radial circular runout impacts the seal ring formation process by altering the contact phase.
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