A preliminary conceptual study for coupled thermo-mechanical and structural characterization of rim-supported run-flat tires

Rim-supported inserts in run-flat tires (RSS RFTs) ensure extended mobility after a blowout, offering at least 50 miles of operation at 45 mph under zero-pressure conditions. However, excessive heat generation during deflation accelerates rubber aging and degrades performance. To address this, a validated 3D finite element model, coupled with Abaqus/CAE and Endurica co-simulations, is used to analyze strain distribution, contact patch characteristics, and thermo-mechanical behavior.

Results reveal high strain and heat generation concentrated in the contact patch center, intensifying material degradation and the risk of premature failure. Strain redistribution mechanisms, shifting strain from the footprint and inner liner zones toward the sidewall, enhance durability and mobility under repeated loading or deflation scenarios. The methodology optimizes insert designs to mitigate localized stresses, deformation, sidewall warpage, and thermal issues, thereby extending fatigue life in deflated conditions.This study highlights critical design factors influencing the durability and performance of rim-supported run-flat tires (RSS RFTs). Simulation-driven methodologies are employed to evaluate and optimize key parameters such as durability, contact patch footprint area, pressure distribution, radial stiffness, and overall operational efficiency. A nonlinear FEA model in Abaqus/CAE accurately simulates large deformations, material behavior, and tire geometry, validated through mesh convergence studies, sensitivity analyses, and failure mechanism evaluations under diverse loading conditions. Predicted fatigue life and thermal performance align with prior studies, confirming the reliability of the approach and its potential for real-world application.