Wei Wei

Liaoning University of Technology | LUT · School of Materials Science and Engineering

Fatigue limit assessment methodologies based on the thermography technique are comprehensively studied in this work. Three fundamental indicators pertaining to temperature increase, intrinsic energy dissipation, and thermodynamic entropy are discussed in sequence. The main train of thought of thermo-based research is outlined. The main objective of...

Dissimilar metal samples of TC4/TiAl were successfully prepared by laser additive manufacturing (LAM) technology, with pure vanadium as the interlayer. The microstructure, phase composition, element distribution and mechanical properties at the interface of TC4/V and TiAl/V were analyzed by optical microscope (OM), scanning electron microscope (SEM...

To identify the discharge features of tungsten inert gas (TIG) welding arc on magnesium alloy workpiece, spectral diagnosing and a self-developed Langmuir probe detection were jointly performed on the welding arc. Results show that during welding, Mg atoms with low ionization energy rush into the burning arc and replace Ar atoms to discharge, which...

This work attempts to develop a theoretical model in combination with the representative volume element (RVE) theory for realizing rapid fatigue limit prediction. Within the thermodynamic framework, it is believed that two components, namely anelastic and microplastic behaviors, which correspond to recoverable and non-recoverable microstructural mo...

The present paper is devoted to the fatigue evaluation of material or structure based on thermodynamic entropy approach. The fracture occures once the cumulative entropy reaches a critical value, the fracture fatigue entropy(FFE). Therefore, in this paper, the relationship between entropy and F-N curves is studied, and an entropy-load-number of cyc...

Traditional temperature-based fatigue strength prediction method, fail to reveal the irreversible energy dissipation behind the fatigue evolution. For the fatigue strength evaluation of Q460 welded joints, a new fatigue strength prediction method, which is based on the energy dissipation of different load levels that exists the turning point, was p...

In this paper, the fracture fatigue entropy (FFE) was used to evaluate the fatigue reliability of Q460 welded joints during high-cycle fatigue. The Q460 butt welded joint fatigue tests were conducted under different loads. Meanwhile, the real-time temperature measurement, monitored by an infrared thermal scanner, was completed. The fatigue limit ca...

In this study, we investigated the fatigue behavior of Q460 welded joints using tensile fatigue tests. Furthermore, real-time temperature profiles of the examined specimens were recorded by infrared thermography. Based on the obtained thermographic data, we calculated the entropy production rate of the specimens under different stress amplitudes. H...