| Jian LU |
| Dip.ing, DEA, Ph.D(UT Compiegne, France), HDR(Sc Dr, Paris VI) |
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Area of Specialization: |
Integration
of prestress and surface treatment in design, multi
axial fatigue life prediction, nanomaterials, mechanics
of advanced materials (biomaterial,
nanomaterial, thermal spraying coating and thin
film, composites)
From
1986 to 1994, he was a senior research engineer
and the head of the laboratory (from 1990) of residual
stress and coating adhesion
at CETIM (French Technical of Mechanical Industry).
Since 1994 he has been Professor, head of the department
of mechanical systems
engineering (1994-2004) and Director of the mechanical
systems and concurrent engineering laboratory (CNRS-FRE2719)
(20 faculty members)
at the University of Technology of Troyes, France.
His recent research interests are: residual stress,
multiaxial fatigue, biomaterial,
metal matrix composite, nanomaterial, plasma spraying
coating and thin film. He has published about 300
papers in above fields. He
is a member of Editorial board of the Journal of
Strain Analysis for Engineering Design, International
Journal of Mechanics and Materials
in Design. He has also served as an associate technical
editor of Experimental Mechanics (International
Journal of Society for Experimental
Mechanics, USA, 1998-2001) and a member of Editorial
board of the ACTA MECHINICA Sinica (2001-2004).
He was a consultant expert for
different worldwide leading companies in the field
of Energy (Framatome, Alstom, EDF), Aerospace (EADS,
Airbus, SNECMA), Automobile (Renault,
PSA, Bosch) for about 20 years.
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Selected
Research Projects |
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| Project
1 ENSPED |
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activity of the ENSPED (European Network of Surface
and Prestress Engineering and Design) leaded by Prof. Jian LU emphasises
the building
of a bridge between the fields of surface modification
and prestressed processing in material engineering and CAD in mechanical
engineering
to find an appropriate way to approach this inter-disciplinary
area. The objective of this project was to develop a global approach
to
use surface modification and prestressing for controlling
and optimising important mechanical properties such as fatigue,
wear and stress
corrosion cracking. As applications, we can mention:
heat treatment and thermochemical processing (quenching, carburizing,
nitriding),
mechanically treated surfaces (ultrasonic shot peening,
shot peening, cold rolling), welding, machining etc¡K This project
explored the
way to introduce the surface modification and prestress
processing in the design of mechanical components and structures.
In fact,
the development of a global approach with associated
CAD-CAM tools is necessary to ease the collaboration between the
engineers working
on material choice, production design and quality
control. Residual stress considerations are becoming important today
for two reasons:
the necessity for the designer to reduce the weight
of the structure and keep the same safety level to be competitive
and the introduction
of multimaterials which induces residual stress.
With the development of different experimental and numerical techniques,
it is now possible
to consider residual stress issues in the design
office for the integrated design of mechanical components. A new
approach of concurrent
engineering applied to the design of mechanical components
with the residual and applied stresses consideration will be developed.
The partnership of this network was composed by four
universities:
University of Technology of Troyes (FR), Kassel University
(DE), LULEA University (SE) and LINKOPING University (SE), which
are leaders
in Europe in different fields of residual stress
problems and fourteen
industries and industrial research centres which
are major European actors in the field of aerospace industry: Aerospatiale
(EADS) and
SNECMA Moteurs (FR), Airbus British Aerospace (UK),
car and truck industry: FIAT (IT), VOLVO and SCANIA (SE), ROBERT
BOSCH (DE), energy
industry: ABB (SE), FRAMATOME ANP (DE), WARTSILA
(FI), mechanical industry: CETIM (FR), INASMET (ES), material supplier:
HYDRO ALUMINIUM
(NO), Instrumentation company: STRESSTECH (FI). So
the industrial areas covered by the network are very large. |
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| Project
Generation of nanostructure and associated mechanical behaviours |
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In this project, a new surface restructuring process
based on the SMAT (Surface Mechanical Attritions
Treatment) was developed. The evidence obtained so
far has already indicated that
a nanostructured surface layer synthesized by means
of the SMAT on metallic materials provides many unique
opportunities in terms
of both fundamental scientific research and technological
applications, including the following:
Investigation
of the strain-induced grain refinement mechanism
on a broad grain size scale (from microns to nanometers);
Study of the structure/property relationship of
a solid in a broad grain/cell size range (several
nanometers ~ micrometers) in the
SMAT sample;
The
gradient structure in the surface layer enables
porosity-free micro-samples with different grain sizes (in surface
layers at different
depths) having the same composition to be prepared
for property measurements;
Development
of a new multiscale approach to mechanical behavior
simulation since not all of failure phenomena observed
can be explained
by classical continuum mechanics;
Enhancement
of the surface mechanical, tribological, chemical and corrosion
properties of bulk materialse. |
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| Selected
publications |
| (A1) |
LU
J., BOUHELIER C., LIEURADE H.P., BARALLE
D., MIEGE B. and FLAVENOT J.F. Study of residual
welding stress using the step-by-step hole
drilling and the X-ray diffraction method,
Welding in the world, vol. 33, n¢X 2, 1994, p. 118-128. |
| (A2) |
WU
Z., LU J., HAN B. Study of residual stress distribution by a combine
method of moire interferometry
and incremental hole
drilling Part I : theory and Part II: implemantation
applied mechanics, Journal of Applied Mechanics, ASME, Dec. 1998, p. 837-850. |
| (A3) |
LU
K. and LU J. Surface nanocrystallization (SNC) of metallic materials
- Presentation of the concept behind
a new approach,
J. Mater. Sci. Technol., Vol.15, no.3, 1999, p. 193-197. |
| (A4) |
AKRACHE
R. and LU J. 3D Calculations of high cycle fatigue life under
out-of-phase multiaxial
loading, Fatigue and Fracture of
Engineering Materials and Structures, Vol. 22, July
1999, p. 527-534. |
| (A5) |
WU
Z., LU J. and GUO Y. A Study of Process-Induced Residual Stress
in PBGA Packages, Journal of Electronic Packaging, ASME, Vol.122,
Sept.2000, p. 262-266. |
| (A6) |
HAN
Y., XU K. and LU J. Dissolution response
of hydroxyapatite coatings to residual stresses,
J. of Biomedical Materials Research, 55,
4, June 2001, p.596-602.
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| (A7) |
LU
J. Prestress Engineering of Structural Material:
A Global Design Approach to the
Residual Stress Problem, Handbook
of Residual Stress Formation and Distorsion
of Steel,
ASM, 2002, p. 11-26.
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| (A8) |
TONG
W.P., TAO N.R., WANG Z.B., LU J. and LU K.
Nitriding iron at lower temperatures,
Science, Jan. 2003, p. 686-688.
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| (A9) |
NUSAIR
KHAN A., LU J. Behavior of air plasma sprayed
thermal barrier coatings, subject
to intense thermal cycling, Surf.
Coat. Tech.,
166, 2003, p. 37-43.
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| (A10) |
LU
J., LU K. Surface Nanocrystallization (SNC)
of Materials and its effect on Mechanical
Behavior, Comprehensive Structural
Integrity,
Editors Milne, Ritchie, Karihaloo, Ed. Elsevier,
vol. 8, 2003, p. 495-528.
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| (A11) |
CAO
Y.P., LU J., A new method to extract the
plastic properties of metal materials
from an instrumented spherical indentation
loading curve, Acta Materialia, 52 (13):
4023-4032 AUG 2 2004.
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| (A12) |
ZHU
K.Y., VASSEL A., BRISSET F., LU K., LU
J.,
Nanostructure Formation Mechanism of
 -Titanium
using SMAT, Acta Materialia,
52 (14): 4101-4110 AUG 16 2004.
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| (A13) |
YA
M., MARQUETTE P., BELAHCENE F., LU
J., Residual
stresses in laser welded aluminium
plate by use of ultrasonic and optical methods.
Materials science and engineering
A, 2004,
vol.382, p. 257-264.
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| (A14) |
CAO
Y.P., LU J., Size-dependent sharp indentation-I:
A closed-form expression of the indentation
loading curve and II: A reverse algorithm
to identify plastic properties of metallic
materials¡¨, Journal of the Mechanics
and Physics of Solids, Jan. 2005, vol. 53, pp33-62.
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| (A15) |
WANG
Z.B., LU J., LU K., Chromizing behaviors
of a low carbon steel processed by means,
ACTA MATERIALIA 53 (7): 2081-2089 APR 2005.
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| (A16) |
CHEN
X.H., LU J., LU L., LU K., Tensile properties
of a nanocrystalline 316L austenitic stainless
steel, Scripta Materialia, 52 (2005) 1039¡V1044,
May 2005.
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