Author
Zhiqiang Li
Bio: Zhiqiang Li is an academic researcher from Beijing Jiaotong University. The author has contributed to research in topics: Disc brake & Flange. The author has an hindex of 10, co-authored 37 publications receiving 286 citations.
Topics: Disc brake, Flange, Brake, Fracture mechanics, Welding
Papers
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TL;DR: In this paper, a finite element analysis (FEA) was performed to determine temperature and stress distribution in the brake disc as well as to estimate stress distribution during braking, which indicated more significant residual, circumferential tensile stress on the external friction surface after emergency braking.
57 citations
TL;DR: In this article, the effect of braking energy on fatigue crack evolution was analyzed by using experimental testing and numerical simulations, which showed that the depth of cracks correlates well with the residual tensile stress distribution in brake discs.
44 citations
TL;DR: In this paper, a modified microstructure consisting of a white etching layer (WEL) containing nanosized ferrite was observed on the friction surface of worn brake discs.
43 citations
TL;DR: In this paper, the cyclic stress-strain response and the low cycle fatigue (LCF) behavior of CrMo-V low alloy steel which was used for forged railway brake discs was studied.
41 citations
TL;DR: In this paper, full scale emergency braking tests were conducted and the peak temperature of localized area was found exceeding the austenitizing temperature of the steel, and the occurrence of embedded crack could be well explained according to the simulation results and low cycle fatigue test results.
39 citations
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TL;DR: There is, I think, something ethereal about i —the square root of minus one, which seems an odd beast at that time—an intruder hovering on the edge of reality.
Abstract: There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.
Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …
33,785 citations
TL;DR: In this article, a semi-elliptical surface crack was inserted into a predicted macroscopic hot spot to carry out the thermal fatigue cracking analysis under consecutive emergency braking, and the predicted peak temperature and calculated crack geometry were well in agreement with the experimental results.
98 citations
TL;DR: In this paper, the effect of building orientation on the very-high-cycle fatigue (VHCF) response of Ti-6Al-4V specimens produced through selective laser melting (SLM) process with three different building orientations (0°, 45° and 90°) has been experimentally assessed.
72 citations
TL;DR: In this paper, a coupled thermomechanical model is used for the FSW simulation and prediction of defect formation through the analysis of the material mixing during Friction Stir Welding (FSW).
Abstract: This work addresses the issue of the simulation and prediction of defect formation through the analysis of the material mixing during Friction Stir Welding (FSW). A coupled thermomechanical model is used for the FSW simulation. To follow the flow of the material, a tracing technique of the material particles is incorporated in the numerical model. A fast and accurate two-stage numerical strategy is adopted to analyse the FSW process. The speed-up stage intends to reach the steady state quickly. The material tracing is performed in the periodic stage where the rotation of the tool is modelled. The effect of the process parameters and the pin features on the defect formation is studied. The model is capable of predicting defects such as void, wormhole, flash and joint line remnant, as well as the formation of “onion rings” in a single simulation. The results show that the proposed model has significant capability to explain and predict the post-FSW defects.
62 citations
TL;DR: In this article, the effect of volume fraction of SiC reinforcement particles on the physical and thermal properties of Al matrix composite (6061) was investigated, and the experimental results were compared to thermoelastic models.
58 citations