Wear Processes - AC²T€¦ · Research- and development services Analysis on request Technology...
2
European Center of Tribology - European Center of Tribology - European Center of Tribology - European Center of Tribology - European Center of Tribology XTribology The major goal is to achieve a detailed understanding of the degradation progress of tribologically stressed materials in technically relevant systems and hence to establish ge- nerally valid wear models. In view of this, it is necessary to introduce novel design parameters to describe tribological materials with extended lifetimes. Therefore, very precise spatially and time-resolved techniques will be applied to de- termine and evaluate wear-related parameters in multilevel tribological systems. For advanced in-situ characterisation, dif- fraction techniques based on X-ray and syn- chrotron radiation are applied, which are also used for time-resolved measurements during bending, annealing and experiments using dynamical loading. In addition, modeling of the stress distribution during mechanical loading for elastic as well as elasto-plastic regime will yield information on surface modi-fications within tri- bological microstructures. novel mathematical, physical, and computa- tional methods are combined into multiscale models to solve various problems of tribo- logical interest state-of-the-art and novel, either serial or parallel, coupling strategies of different length and time scales new insights into the underlying multiscale mechanisms of tribological processes comprehensive theoretical database for common tribological cases establishment of design rules for (nano)tribological systems based on proper theoretical models new software tools (e.g., for dynamic and static tribological computations) AC²T research GmbH - Viktor Kaplan-Straße 2 2700 Wiener Neustadt Österreich Tel.: +43(0)2622 81600-210 Fax: +43(0)2622 81600-99 E-mail: [email protected] WWW.AC2T.AT I D CZ SK H SL Salzburg Wien Graz Linz Wr. Neustadt Q The “COMET” research at the Center of Excellence of Tribology is funded by ... Austrian Research Promotion Agency Province of Niederösterreich (via “tecnet capital Technologiemanagement GmbH”) Provinces of Vorarlberg and Wien ... and numerous scientific partners Research- and development services Analysis on request Technology transfer Scientific expertises Tribological processes (e.g., friction and wear) are multiscale phenomena in their nature (i.e. hierarchical in length and time). Therefore tribological systems can be realistically simu- lated in a multiscale fashion only, namely by coupling various computational methods, which are highly accurate on their typical length/time scales. In view of these major challenges involved, it is expected that calculations and simulations will gain new insights and findings, which in turn will further promote other closely related scientific and technological developments (e.g., in the field of production technologies). The objective of this area is also to support all computational efforts in the centre by providing adequate theoretical models and software tools. Clearly this sort of activities represents only a field of interest among others, because the huge scientific potential within this area will be explored in many directions. COMET K2 project Excellence Centre of Tribology Computational Tribology Wear Processes MOTIVATION MAJOR GOALS MAJOR GOALS MOTIVATION exploring fundamental physical phenomena dealing with wear processes (adhesion, abrasion, fatigue) especially in nano-scale range by numerical simulations detailed understanding of the degradation progress of tribo-surfaces in model tests using very accurate time-resolved techniques for characterisation and determination of wear-related parameters development of intelligent tribo-surfaces and in-situ time- and area resolved investigations of fundamental tribological phenomena applying digital tribocontacts ascertaining the influence of environmental conditions (e.g., extreme temperatures, humidity, special atmospheres, vacuum, abrasive particles) as function of time on wear processes (e.g., tribooxidation, tribocorrosion) Development of advanced wear algorithms basedon the knowledge gained above, and validation of so-resulting theoretical models with respect to experiments made on ideal systems MD wear simulation of boundary lubrication failure (self-assembled monolayers of fatty acids) © AC²T 2011 Computer controlled high temperature Vickers hardness test equipment (up to 800°C) High temperature cyclic impact abrasion tester (up to 750°C) Multiscale 10 -9 10 -6 10 -3 10 0 length scale [m] tribochemistry, tribocorrosion boundary lubrication abrasion, plowing, pitting, ratcheting material transfer, tribolayer formation 3 -body mechanisms rd mixed lubrication (elasto-)hydro- dynamic lubrication heat, stress, strain vibration, noise, stick-slip adsorption, adhesion atom/molecule asperity component assembly relevant entity Examples of important tribological effects and their typical length scales MAJOR GOALS MAJOR GOALS
Transcript of Wear Processes - AC²T€¦ · Research- and development services Analysis on request Technology...
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para
mete
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inm
ultileveltr
ibolo
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in-s
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chara
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risation,
dif-
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techniq
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based
on
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ay
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syn-
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radia
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are
applied,
whic
hare
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o
used
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tim
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measure
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during
bendin
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annealing
and
experim
ents
usin
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ultis
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/tim
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s.
Invie
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majo
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involv
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dth
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ula
tions
and
sim
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turn
will
furt
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pro
mote
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clo
sely
rela
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scie
ntific
and
technolo
gic
al
develo
pm
ents
(e.g
.,in
the
field
ofpro
duction
technolo
gie
s).
The
obje
ctive
of
this
are
ais
als
oto
support
all
com
puta
tional
effort
sin
the
centr
eby
pro
vid
ing
adequate
theore
tical
models
and
softw
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learly
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sort
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COMETK2project
ExcellenceCentreofTribology
Co
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Wear
Pro
cesses
MOTIVATION
MAJORGOALS MAJORGOALS
MOTIVATION
explo
ring
fundam
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alphenom
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dealing
with
wear
pro
cesses
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num
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oftr
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urf
aces
inm
odelte
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usin
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accura
tetim
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for
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apply
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ibooxid
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ibocorr
osio
n)
Develo
pm
entofadvanced
wear
alg
orith
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the
know
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gain
ed
above,and
validation
ofso-r
esultin
gth
eore
ticalm
odels
with
respectto
experim
ents
made
on
ideal
syste
ms
MD
wear
sim
ula
tio
no
fb
ou
nd
ary
lub
ric
ati
on
failu
re
(self
-assem
ble
d
mo
no
layers
of
fatt
yacid
s)
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Co
mp
ute
rco
ntr
olled
hig
h
tem
peratu
re
Vic
kers
hard
ness
test
eq
uip
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t(u
pto
800°C
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ab
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trib
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ato
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ten
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so
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olo
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ects
an
dth
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typ
icalle
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thscale
s
MAJORGOALS MAJORGOALS
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sm
all
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epth
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pro
cesses
on
am
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colloid
aland
mic
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level(r
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mechanis
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and
reaction
kin
etics)
sta
tic/d
ynam
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ula
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ofre
alaltera
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pro
cesses
with
uniq
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altera
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meth
ods
impro
ved
and
novelanaly
ticalm
eth
ods
for
the
chara
cte
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oflu
bricantand
fuel
pro
pert
ies,in
part
icula
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rstr
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pro
pert
y-e
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corr
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refined
description
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ple
xcorr
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trib
ocorr
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trib
ochem
ical
pro
cesses
guid
elines
for
the
desig
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lubricants
and
chem
ically
modifie
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surf
aces
concepts
ofla
b-o
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-chip
syste
ms
for
continuous
oil
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onitoring
Intr
ibosyste
ms
changes
of
lubricant
pro
-
pert
ies
due
toaltera
tion
affect
chem
icalin
ter-
actions
with
the
surf
aces.
Inord
er
todesig
n
new
lubricants
and
chem
ically
modifie
dsur-
faces
with
optim
ised
inte
ractions
on
mole
cula
r
level,
an
entire
unders
tandin
goflu
bricantsur-
face
inte
ractions,lu
bricantaltera
tion,and
their
influence
on
trib
osyste
mperf
orm
ance
can
only
be
achie
ved
by
novel
appro
aches
toart
ific
ial
altera
tion
as
well
as
lubricant
and
surf
ace
chara
cte
risation.
The
desig
nof
appro
priate
environm
enta
lly
benig
nchem
icalstr
uctu
res
mustta
ke
pla
ce
at
avery
early
sta
ge
ofre
searc
h.
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oil
conditio
nm
onitoring
and
oil
main
tenance
syste
ms
are
necessary
tosig
ni-
ficantly
optim
ise
oil
change
inte
rvals
due
to
econom
ical
as
well
as
ecolo
gic
al
require-
ments
.
The
roots
of
glo
bal
trib
olo
gic
al
behavio
ur
are
tobe
found
inlo
caland
nanoscopic
effects
at
trib
olo
gic
ally
str
essed
surf
aces,
whic
hare
als
ogovern
ed
by
the
str
uctu
ralbehavio
urofth
e
trib
osyste
ms.
Deta
iled
unders
tandin
gof
these
effects
makes
itnecessary
toesta
blish
suitable
measuring
techniq
ues
as
well
as
advanced
sensor
devic
es
accom
panie
dby
appro
priate
evalu
ation
alg
orith
ms.
The
uniq
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dia
gnostic
capabilitie
sof
the
centr
eare
em
plo
yed
on
model
trib
om
ete
ren-
vironm
ents
toscre
en
the
multip
lecom
bin
ations
ofin
tera
cting
para
mete
rsand
are
enhanced
to
enable
investigation
ofre
alsyste
ms.
The
thre
epilla
rsofth
eovera
llappro
ach
are
:
(a)
trib
om
etr
olo
gy
-sensors
,m
easuring
sys-
tem
sand
evalu
ation
alg
orith
ms
-th
atis
suitable
for
curr
ent
and
futu
rere
quirem
ents
of
funda-
menta
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searc
h,(b
)decip
hering
-dentification
and
extr
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-ofnanoscopic
orlo
caleffects
at
trib
osurf
aces
and
sub-layers
(tribolo
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le-
vantsurf
ace
layers
)to
expla
inth
eperf
orm
ance
ofa
trib
osyste
m,(c
)enabling
measura
bility
for
pro
cess
and
quality
monitoring
as
well
as
subsequent
esta
blishm
ent
of
desig
nru
les
for
trib
olo
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ally
optim
ised
machin
eele
ments
.
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main
motivation
for
the
pro
gra
mm
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r
com
pete
nce
centr
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(a)
pro
vis
ion
of
afr
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ew
ork
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furt
her
innovative
develo
pm
ent
of
expert
ise
already
esta
blished
(b)
develo
pm
entofnew
expert
ise,bundling
of
exis
ting
com
pete
nces,
and
develo
pm
ent
of
researc
hofouts
tandin
gquality
via
inte
rnational
orienta
tion
thro
ugh
str
uctu
ral
adju
stm
ents
and
perm
anent
quality
assura
nce
(c)
sta
bilis
ation
of
the
num
ber
of
centr
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line
with
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ian
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