Institute of Fundamental Technological Research
Polish Academy of Sciences

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Xin Yuan

Imperial College London (GB)

Recent publications
1.  Liu S., Wu J., He S., Yuan X., Stupkiewicz S., Wang Y., Effect of substrate stiffness on interfacial Schallamach wave of flexible film/substrate bilayer structure: Cohesive contact insight, TRIBOLOGY INTERNATIONAL, ISSN: 0301-679X, DOI: 10.1016/j.triboint.2024.110358, Vol.202, pp.110358-1-14, 2025

Abstract:
As the critical feature of the stick-slip for soft materials, the interfacial Schallamach waves of flexible composite structures are essential for smart tactile sensors to realize sliding perception. Herein, the Schallamach waves of polydimethylsiloxane film/substrate bilayer structures with three substrate stiffnesses regulated by porosities are investigated by setting up in-situ sliding tests and establishing finite element models with mixed-mode cohesive contact. Inhomogeneity in microcontact stiffness disrupts the continuity and synchronization of the Schallamach waves, resulting in non-periodic fluctuations in the contact force. The buckling phenomenon of the film structure marks the transition from stick to slip. This buckling induces a shift at the crack front from normal compressive stress to tensile stress, leading to mixed-mode damage.

Keywords:
Stick-slip,Polydimethylsiloxane film/substrate bilayer structures,Schallamach wave,In-situ sliding test,Mixed-mode cohesive contact model

Affiliations:
Liu S. - IPPT PAN
Wu J. - other affiliation
He S. - other affiliation
Yuan X. - Imperial College London (GB)
Stupkiewicz S. - IPPT PAN
Wang Y. - Beijing Aeronautical Manufacturing Technology Research Institute (CN)
2.  Kopeć M., Kukla D., Yuan X., Rejmer W., Kowalewski Z.L., Senderowski C., Aluminide thermal barrier coating for high temperature performance of MAR 247 nickel based superalloy, Coatings, ISSN: 2079-6412, DOI: 10.3390/coatings11010048, Vol.11, No.1, pp.48-1-12, 2021

Abstract:
In this paper, mechanical properties of the as-received and aluminide layer coated MAR 247 nickel based superalloy were examined through creep and fatigue tests. The aluminide layer of 20 µm was obtained through the chemical vapor deposition (CVD) process in the hydrogen protective atmosphere for 8 h at the temperature of 1040 °C and internal pressure of 150 mbar. A microstructure of the layer was characterized using the scanning electron microscopy (SEM) and X-ray Energy Dispersive Spectroscopy (EDS). It was found that aluminide coating improve the high temperature fatigue performance of MAR247 nickel based superalloy at 900 °C significantly. The coated MAR 247 nickel based superalloy was characterized by the stress amplitude response ranging from 350 MPa to 520 MPa, which is twice as large as that for the uncoated alloy.

Keywords:
chemical vapor deposition, nickel alloys, aluminide coatings, high temperature fatigue, creep

Affiliations:
Kopeć M. - IPPT PAN
Kukla D. - IPPT PAN
Yuan X. - Imperial College London (GB)
Rejmer W. - other affiliation
Kowalewski Z.L. - IPPT PAN
Senderowski C. - other affiliation

Conference abstracts
1.  Kopeć M., Yuan X., Wang K., Wang L., Kowalewski Z.L., Microstructure and damage evolution of Ti6Al4V under fast forming conditions, BSSM, 15th International Conference on Advances in Experimental Mechanics, 2021-09-07/09-09, Swansea (GB), pp.1-2, 2021

Abstract:
The paper aims to investigate the nature of fracture behaviour through the microstructural and damage evolution analysis of a titanium alloy (Ti6Al4V) with tailored initial microstructures under FAST conditions. High-temperature uniaxial tensile tests with varying heating rates (4°C/s and 100°C/s) and temperatures (900 - 950°C) were conducted to study the effects of heating parameters on the formability and damage of the material. The microstructure and fracture morphology after high-temperature uniaxial tensile tests were characterised to reveal the evolution mechanisms of elongation and damage. It was found, that fast heating could restrain the phase transformation of α to β during the heating and therefore improve the formability of the Ti6Al4V titanium alloy under hot stamping condition.

Keywords:
Ti6Al4V, hot stamping, fracture behaviour, damage evolution

Affiliations:
Kopeć M. - IPPT PAN
Yuan X. - Imperial College London (GB)
Wang K. - Imperial College London (GB)
Wang L. - Imperial College London (GB)
Kowalewski Z.L. - IPPT PAN
2.  Kopeć M., Wang K., Yuan X., Wang L., Kowalewski Z.L., A novel fast light alloys stamping technology (FAST) for complex titanium alloy components, 5th National Scientific Conference Science and Young Researchers, 2021-06-05/06-05, Łódź (PL), pp.1, 2021
3.  Kopeć M., Wang K., Yuan X., Wang L., Kowalewski Z.L., Fast light alloys stamping technology (FAST) for two-phase titanium alloys, PGEM, The Sixth Postgraduate Experimental Mechanics Conference, 2020-12-03/12-04, Manchester (GB), pp.1, 2020

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