Examples using winLIFE
Automotive
A lot of
winLIFE-users come from the automotive industry. The following typical
applications are.
Driveline
clutches,
torque-converters, retarders, housings of gearboxes, shafts, planetary gears,
torsional springs for passenger cars, trucks and agricultural vehicles.
Measurements on real tracks have been done to take into account real
conditions. A race track in
Figure 1: Dwelling time of the output torque
versus speed of for a s-speed automatic gearbox on the race track
Nürburgring
Figure 2: 7-speed automatic gear box of DaimlerChrysler
Suspension:
winLIFE
is used for the design and test of military vehicles. Suspensions, axles,
springs are calculated. Measurements on different road types are used to
determine the specific input loading from the road. A comparison between damage on the vehicle,
test rig results and simulation showed a good correlation
Figure 3 military vehicle Fennek, which was
calculated with winLIFE
Figure 4:
wheel and the fatigue analysed hub
Figure 5 results of calculation of Fennek on
different road types and missions
Plane Applications
The
moving of airplanes at an airport is more efficient if pulling trucks are used.
The truck is mounted to the front landing gear and the question arose whether
there might be a problem in fatigue life.
On the
front landing gear strain gauges were applied and the strain during the truck
pulling at the airport and during the landing was measured.
A fatigue
life analysis was done and a comparison between landing and truck pulling
showed under which conditions the system can be used.
Figure 6: Plane that was used for
measurement
Figure 7: Landing gear with strain gauges
As a
result the fatigue life for the landing procedure and truck pulling could be calculated
and a relation between the load cases could be found.
Energy-Systems
In the
wind energy industry winLIFE is used to calculate different components of the
system such as the tower, rotary hub and components. Many parts of a wind
energy system must be designed and fatigue prediction is necessary.
There are
many different load scenarios that must be analysed. By measuring the forces
and torques on the rotor, the load histories are obtained and used as base for
a fatigue life prediction.
To
simplify the work for the developers of windturbines some rules for the design
coming from the German Lloyd are implemented in winLIFE.
The
following picture shows a windturbine which was calculated using S4WT (SAMCEF
for Windturbines). A data interface allows the user directly the access to
winLIFE to performe a fatigue calculation directly.
Figure 8: machine housing of a windturbine
created with SAMCEF
The
follwong picture shows the results of a fatigue calculation of a gearbox
housuing from Zollern company. ANSYS together with winLIFE was used.
The picture
shows the damage sum over the surface..
Figure 9: Housing
of a gearbox calculated by Zollern Company,
Naval Industry
Dynamic loading in ships is mainly caused by
waves. If the front and heck are on the top of a wave, then this results in
bending of the total body. If you imagine, that there are waves with a height
of 10 meters or more, than you can imagine what kind of loadings are acting. A
ship is in use for 30 years or more and the fatigue life is a very important
criterion of design. You can use existing standards for S-N-curves which you
can enter in winLIFE.
Universities
Many
universities use winLIFE for their courses. A special university edition is available
to meet the demand for a greater number of installations. winLIFE is simple to
use and it has the functionality necessary to demonstrate fatigue behaviour in
high level lectures.
Simple to
use does not mean that you do not need an understanding of the theory. But
winLIFE is a well documented tool that enables the user to understand what he
is doing and we presume that our users want to understand what they are doing. To be successful in fatigue prediction you
need an extensive understanding of the theory and a student can learn this using
winLIFE.
The
university version includes a full, unlimited version including all tools and
one hardlock for the professor. He can use winLIFE on his own laptop with the
hardlock. A floating license is included enabling 10 students to use the
winLIFE BASIC version. This student version is slightly limited but quite
sufficient for academic use.
Figure 10:
interactive simulation of stress and strain. Load step, resulting stress strain
path and damage is shown in one picture and can be added interactively by the
user. In this way masing and memory are demonstrated and can be checked.
Figure 11:
Animation of Neuber`s rule. Starting point, resulting stress and strain and the
hyperbola are animated by moving the mouse. Different types of Neuber
modifications can be shown. This helps to understand the effects.
Figure 12:
to understand stress and strain state Mohr’s
circle can be shown for each time step. A deep understanding and analysis of
the problem is possible.
Figure 13:
yielding model according to Mrosz