Inam Ur Rehman
合肥工业大学
Analysis of thermal stress singularity for sharp corner in a rotating body
Based on the geometric characteristics of the rotating body, the displacement and heat flux at the notch tip are asymptotically expanded as periodic functions in the circumferential direction. These expansions are then substituted into the three-dimensional elastic equilibrium equations and the heat flux equilibrium equation, yielding equilibrium differential equations containing only physical quantities within the axial cross-section. Subsequently, a Williams asymptotic expansion is performed at the notch tip, leading to a singular characteristic equation. Solving the singular characteristic equation yields the stress singularity exponent and the characteristic angular function. The finite element method is then employed to discretize the notch in the rotating body. The thermal stress intensity factor at the notch tip is obtained using an extrapolation technique. A comparison is made between the thermal stress intensity factor for the notch in the rotating body and the stress intensity factor for a notch in a flat plate. It is found that when the notch depth is shallow, the stress intensity factor for the rotating body notch is smaller than that for the plane notch. Furthermore, the thermal stress intensity factor for the rotating body notch is compared with the stress intensity factor for an equivalent mechanical load. It is observed that for shallow notches, the thermal stress intensity factor of the rotating body notch is slightly larger than the stress intensity factor of the equivalent mechanical load notch. Conversely, for deeper notches, the thermal stress intensity factor becomes smaller than the equivalent mechanical stress intensity factor.
He is a Ph.D. candidate in the School of Civil Engineering, Department of Engineering Mechanics at Hefei University of Technology, with a multidisciplinary background integrating materials science, computational modeling, and applied physics. His research interests are in solid mechanics, explores complex phenomena, including stress singularities at crack tips, coupled thermoelastic behaviors under transient thermal gradients, and the mechanical responses of anisotropic materials. These studies reveal material performance under extreme thermal-mechanical loads, informing applications in aerospace composites and high-temperature structures.