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.
Figure 8 wind energy system
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 9: 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 10 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 11: 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 12 : yielding model according to Mrosz