Publications
Showing 244 results for Author: Zhili Feng
Aug, 2026
Conference Paper
Prediction of residual stresses in a multipass pipe weld by a novel 3D finite element approach
Due to enormous computation cost, current residual stress simulation of multipass girth welds are mostly performed using two-dimensional (2D) axisymmetric models. The 2D model can only provide limited estimation on the residual stresses by assuming its axisymmetric distribution. In this study, a highly efficient thermal-mechanical finite element code for three-dimensional…
Aug, 2026
ORNL Report
NOVEL TIN-BASED WET COATING AND SOLID-STATE JOINING FOR BIPOLAR PLATE MANUFACTURING
Mar, 2026
Conference Paper
Microstructure and Mechanical Performance of X120 Linepipe Steel in High-Pressure Hydrogen Gas
Mar, 2026
Conference Paper
An Engineering Approach for Weld Creep Lifetime Assessment Based on Local Property Measurement
The localized creep failure in the heat-affected zone (HAZ) of Grade 91 steel weldments has been identified as one of the most important factors causing significantly shortened service lifetime and structural integrity issues of welded components in advanced fossil and nuclear power plants. To conduct a reliable creep lifetime assessment, a new engineering assessment appro…
Mar, 2026
Conference Paper
Scale-Up of Friction Self-piercing Riveting Process for Multi-material Joints
A single-class joining process known as “friction self-piercing riveting (F-SPR)” has been developed for joining various low-ductility lightweight materials on a laboratory scale. The frictional heat generated during the F-SPR process improved local ductility, resulting in crack-free joints and robust mechanical performance. This innovative joining technology was further a…
Mar, 2026
Conference Paper
Friction Self-piercing Riveting Process for 3T Configuration of AA7075-AA7075-AA6022
Friction self-piercing riveting (F-SPR), as a solid-state joining process that generates frictional heat during the process, was utilized to join a 3 T configuration of low-ductility AA7075-AA7075-AA6022 sheets. A multi-step F-SPR process was employed to precisely control the mechanical interlocking and solid-state joining, ensuring a strong joint formation. With control o…
Mar, 2026
Conference Paper
Develop a Fast Analysis Solver for Welding Sequence Optimization
During the shipbuilding manufacturing process, materials are exposed to significant stresses, as induced both thermally and mechanically, that alter the intended design and significantly affect the production schedule, labor hours (fitting, welding, rework, etc.), and material structural performance. The type and magnitude of deformation of a given structure depends on man…
Mar, 2026
Conference Paper
Modeling-Based Design and Optimization of a Gradient Composite Transition Joint
An innovative additively manufactured gradient composite transition joint (AM-GCTJ) has been designed to join dissimilar metals, to address the pressing issue of premature failure observed in conventional dissimilar metal welds (DMWs) when subjected to increased cyclic operating conditions of fossil fuel power plants. The transition design, guided by computational modeling…
Feb, 2026
Journal
On the roles of welding residual stresses in determination of fracture toughness in austenitic stainless steel SUS 304 pipeline girth welds
Welding residual stresses especially the high tensile stresses are proved to have negative impacts on the fatigue and fracture behaviors of welded structures. In this study, a virtual fabrication of test specimens from welding process to specimen preparation was carried out by numerical simulation. An austenitic stainless steel multi-pass pipe welding was simulated by tran…
Dec, 2025
Journal
Laser Repair Welding of Irradiated Alloy 182
Welding repair of irradiated nickel-based alloys, such as Alloy 182, poses a significant challenge due to helium-induced cracking (HeIC) and grain boundary degradation (GBD) in the heat affected zone, driven by helium accumulation at grain boundaries and welding-induced tensile stresses. This study investigates the weldability of irradiated Alloy 182 up to 15 wppm doped bo…