www.femfat.com FEMFAT 4.7b is available! FEMFAT 4.7b is available!

Spring Edition 2008 - No. 14
Invitation to the FEMFAT User
Meeting Japan, June 19, 2008
FEMFAT 4.7b
is available!
Post-Congress Party 2006
Content:
Invitation to the FEMFAT User Meeting
Japan, June 19, 2008 _________ 1
Apple iPod touch to be won ______ 1
64bit Release for
Windows available _____________ 1
Summar y of 2 years of
FEMFAT Roadshows____________ 2
FEMFAT STRAIN innovations ____ 2
FAQs:
• Does the ANSYS RST inter face
have any peculiarities? ______ 3
• What settings are required for
importing grid point forces? ___ 3
• Can FEMFAT perform an evaluation
to the Dang Van criterion _____ 3
Planned elimination of obsolete
CAE-inter faces in FEMFAT ______ 3
Training - Dates _______________ 4
MAGNA FEMFAT worldwide _____ 4
Event Calendar ________________ 4
Publisher´s information ________ 4
Visit our website:
www.femfat.com
We are par ticularly pleased about the
invitation from our Japanese distribution
par tner for the TOYOTA group, Toyota
Technical Development Corporation (TTDC),
to hold this years FEMFAT User Meeting in
the Nagoya Office, and invite all Japanese
FEMFAT users and other interested parties
to participate.
To the accompaniment of presentations by
Japanese FEMFAT users we present the
newest methods andapplications on topics
such as the assessment of welded
structures, thermomechanical fatigue of
engine components or on spot welding and
self piercing rivets. Beside Toyota numerous
other impor tant Japanese vehicle
manufacturers, mechanical
engineering and supplier
companies have registered to
participate.
A new delegate record of more
than 70 experts is anticipated.
Use the Japanese FEMFAT
user network to discuss
applications, methods and
practice with colleagues and
the FEMFAT team.
The event runs from 9 a.m. – 16 p.m.; more
information on the FEMFAT User Meeting
Japan can be obtained from the Magna Tokyo
Office:
Mr Kazumasa Kato,
Tel: (0)3 3548 0310, Fax: (0)3 3548 0319,
Cellular (0)80 3122 5737,
Email: kazumasakato@magnaint.co.jp.
Address for FEMFAT User Meeting Japan:
TOYOTA Technical Development Corporation,
Nagoya Office (http://www.toyota-td.jp/en/),
NORE Sakuradori Bldg., 2-28-23 Izumi,
Higashi-ku, Nagoya, Aichi, 461-0001 Japan
H. Dannbauer
Apple iPod touch
to be won
64bit Release for
Windows available
Here at FEMFAT - the software made by
engineers for engineers - one of our biggest
concerns is regular surveying of customer
satisfaction, from the project manager
through the software user to the system
administrator.
We therefore appeal to all our worldwide
customers to fill out a small questionnaire
on our website at www.femfat.com from midMay onwards.
The survey is anonymous; i.e. people and
answers are not stored or evaluated together.
The names of those who provided feedback
will be entered in a prize lottery at the end
of June.
The first prize is an "Apple iPod touch" (8
GB memory, only 8 mm thick,..., the ideal
companion for long business trips or traffic
jams); winners 2 to 10 will receive a USB
flash memory.
We thank you in advance for your
participation.
After prolonged and tenacious effor ts by
our developers it is now (finally) available:
the 64-bit Beta Release for Windows XPx64,
Vistax64 and Server 2003x64 is available
for download on our website.
A. Werkhausen
C. Gaier
This version allows very large FEM models,
containing several million elements, to be
analyzed, depending on the available RAM.
The 2 GB RAM limitation, familiar from 32
bit systems, is eliminated.
This version has been exhaustively tested;
it is only referred to as a beta version
because problems with the Medina interface
have not yet been satisfactorily solved. The
Win64 version code is identical to that of
version 4.7b.
We hope that numerous users take
advantage of this and look for ward to
receiving any kind of feedback.
FEMFATNEWSLETTER
Spring Edition 2008 - No. 14
Summary of 2 Years of FEMFAT Roadshows
We have now been organizing roadshows in Europe for 2 years
under the banner of "Closer to the customer". The dual model of
a serious informational event for interested parties and as a topical
discussion platform for existing customers has proven highly
successful and we will expand this model to cover North America.
Overall, a total 170 visitors attended 9 events; we believe this is
an optimum frequency, both justifying the effor t and allowing
individual consultations. We wish the support and distribution staff
under Axel Werkhausen continued success!
H. Dannbauer
FEMFAT STRAIN Innovations
It is possible to visualize both stains and stresses
(see the following example of stresses from TransMAX).
Version 4.7 includes a number of improvements and innovations
in the STRAIN module.
The strain gages can now be ver y easily defined in the shape of
tables, both in the STRAIN sub-module "Calc" for evaluating strain
histories regarding damage, as well as in "Comp" for comparing
measured strain histories with FEMFAT results:
CompSTRAIN has been integrated into BASIC and MAX and can
now be utilized either together with a damage/fatigue safety analysis
or separately.
The label, name, modeling method, strain gage type (linear, 45°
rosette, 60° rosette), element and node numbers, input file, column
numbers, initial strain, dimensions, multiplication factor and repetition
factor are specified for the columns.
Particular attention was paid to the simplicity of defining the position,
direction and length of the strain gage. It is possible to use folded
triangular elements, just as before; however, the onerous labeling
of nodes and elements with colors and material IDs is no longer
necessary, the element label data in the table suffices.
If it is nevertheless necessary to use the old labeling method, this
is possible by specifying the element label "0".
The CTR (center) option determines the FEM stress at the center
node of the triangular element by interpolation using element shape
functions and projection in the strain gage direction.
Using the ALL option, in contrast, the stress is integrated and
averaged over the entire length of the strain gage, providing better
comparison data to the test in zones with higher gradients. The
N2N ("node to node") option provides a simple option for specifying
the position and direction of the strain gage.
In this case only two nodes need to be specified, whereby the first
node defines the position of the strain gage and the second node
the direction.
In FEMFAT MAX the histories of measured strains and FEM results
can now be visualized superimposed and thus be directly compared
to each other.
CalcSTRAIN allows measured strain signals to be utilized for strength
analyses using the FEMFAT method.
This does not even require an FEM model - contrary to our tradition
- but only material properties, etc.
However, the advantages of a consistent comparison between
computations and measurements are obvious.
In summar y, we believe that STRAIN now represents a
technically considerably more attractive product at an unchanged
price.
Finally, an important practical note is given here:
Because CalcSTRAIN's memory requirement is currently relatively
high the settings in the femfat.ini file should be optimized. (No
special measures are required for CompSTRAIN!)
An excerpt of possible setting for the femfat.ini file is reproduced
below:
Maximum number of nodes
Maximum number of elements
Highest allowable node-label
Highest allowable element-label
Average number of nodes per element
FEMFAT MAX: Maximum number of channels
FEMFAT MAX: Maximum number of samples per channel
FEMFAT MAX: Maximum number of samples over all channels
FEMFAT MAX: Maximum number of cutting planes
FEMFAT STRAIN: Maximum number of strain gauges
10
10
10
10
12
3
200000
600000
18
30
In addition, the defined repetition factor should not be too large (<
100).
K. Hofwimmer
2
FEMFATNEWSLETTER
Spring Edition 2008 - No. 14
FAQs
A curve with the following mean stress sensitivity M (corresponds
to a negative curve slope) has to be specified as the Haigh diagram
for tension/compression mean stresses:
Does the ANSYS RST interface have any
peculiarities?
In order to import the results of an ANSYS analysis into FEMFAT in
a binary *.rst file, please ensure that the finite element structural
data is also included.
FEMFAT also requires this data when importing the results. If the
ANSYS settings are left on "Default" there will not be any problems.
However, if the command "NO_RSTGM=1" is included in the
configuration file the necessar y information will be missing and
FEMFAT aborts importing the results from *.rst.
E. Dutzler
What settings are required for importing grid point
forces?
If the nodal forces are to be impor ted for a FEMFAT SPOT (JSAE
method) or FEMFAT WELD (SSZ/MSZ method) analysis, the
corresponding check box (see figure) must first be activated. This
option prevents excessive memor y use. Note: Node forces can
currently be imported from NASTRAN op2 and MEDINA bof.
(4)
There are now two options available for def. Haigh diagrams in FEMFAT:
1. Standard design using material parameters, which must be
appropriately adapted:
For the pulsating tensile strength limit (defined in FEMFAT as the
upper stress) this results in:
(5)
For the pulsating compressive strength
lower-stress) this further results in:
(6)
(define in FEMFAT as the
And finally, for the fictitious tensile strength
Haigh-diagram in FEMFAT:
used to close the
(7)
Disadvantage of standard design: A Dang Van assessment can no
longer be carried out for high compressive mean stresses, which
are greater than the pulsating compressive strength, see Fig. 1
2. User-defined Haigh diagram:
In this case it is sufficient to specify two points in a table to define
the curve.
GUI for the node forces in BASIC
GUI for the node forces in MAX
E. Dutzler
Can FEMFAT perform an evaluation to the Dang Van
criterion?
Professor Dang Van, currently engaged at the École Polytechnique,
Palaisea Cedex, developed an endurance stress limit criterion during
the 1970s, making him world famous in the fatigue community.
FEMFAT does not directly offer the Dang Van criterion, but results
generally corresponding to the Dang Van criterion can be achieved
by using suitable settings for the material and analysis parameters.
According to Dang Van's hypothesis material failure does not occur
if the following condition is fulfilled for the entire load cycle:
(1)
is the shear stress amplitude and
the hydrostatic
stress component, a and b are material parameters that allow the
tensile/compressive and alternating shear stress to be computed
for FEMFAT:
(2)
(3)
If an endurance safety factor analysis is carried out in FEMFAT MAX
using the default "Scaled normal stress in critical cutting plane"
method, exactly the same results are achieved for superimposed
alternating bending and torsional loads with phase shift as for the
Dang Van method.
The situation is somewhat more complex for existing mean stresses.
A differentiation is made between tensile/compressive (or bending)
or torsional mean stresses.
Fig. 1: Haigh diagram for evaluation according to Dang Van, blue: standard design,
green: user-defined
For torsional mean stresses there is no mean stress influence after
Dang Van; however more recent research has shown that this is only
true for small values. In this case it is possible to deactivate the
mean stress influence in FEMFAT. However, in many cases the exact
load situation is not known and may var y in location and time.
Analysis using the above mean str ess influence for
tension/compression is then recommended. This will then produce
conservative results.
Finally, please note that the Dang Van model does not take the
support effect in notches into consideration. The stress gradient
influence in FEMFAT can therefore be deactivated for an evaluation
after Dang Van. However, because the results may be considerably
C. Gaier
Planned Elimination of obsolete
CAE-Interfaces in FEMFAT
It is planned to no longer support the following interfaces from FEMFAT
4.8 onwards:
• SDRC I-DEAS VI-i Universal
- Import FEM entity, stress, temperature, sec. dendrite arm
spacing
- Export FEMFAT results
• INTERGRAPH Neutral (import FEM entity)
• ANSYS GEOWRITE (import FEM entity)
• TOSCA ONF 520 (export FEMFAT results), new ONF600+601
• STEYR dataset 205 (import load history into ChannelMAX).
If (contrary to expectations) one of these interfaces is still required,
please contact us before the end of June 2008 at the latest.
C. Gaier
3
FEMFATNEWSLETTER
Spring Edition 2008 - No. 14
Training - Dates 2008
Engineering Center Steyr, St. Valentin
3.-4. June
6.-7. August
15.-16. October
3.-4. December
Fatigue life/Damage and
safety factors for simple loads,
comprehensive FE-interfaces
and material database
Engineering Center Troy, Detroit
29. February
18. June
11. September
18. December
Prices (excl. VAT.):
per delegate
per additional delegate
from the same company
University/Research group
Euro 770,Euro 610,Euro 300,-
Including 2 months FEMFAT evaluation license
Information: a.schmidthaler@ecs.steyr.com
3D-postprocessor and
WELD definition
Magna Powertrain
Engineering Center Steyr GmbH&Co.KG
Structural Analysis Department
Steyrer Straße 32, 4300 St. Valentin, Austria
Phone +43 7435 501 336
Fax
+43 7435 501 300
E-Mail: axel.werkhausen@ecs.steyr.com
Multiaxial fatigue
Magna Powertrain Engineering Center Troy
1775 Research Drive, TROY, MI 48083
Phone +1 248-680 4919
Fax
+1 248 524 5570
E-mail: femfat.usa@ecs.steyr.com
Magna International Japan Inc.
2-1-6 Chuo-ku, Yaesu k Building 5F
104 0028 TOKYO
TEL
+81 (0)3 3548 0310
FAX
+81 (0)3 3548 0319
Mobile +81 (0)80 3122 5737
E-mail: kazumasakato@magnaint.co.jp
Welded structures
Spot-joined structures
Magna International China
801-813, Tower A, Eton Place, 69 Dongfang Road, Pudong
Shanghai PRC 200120
Tel:
+86-21-6165 1500(Master Line) ext.6649
Tel:
+86-21-6165 1652, Fax: +86-21-6163 9099
Mobile: +86-15900861655
E-mail: wenxuan.zhang@magnapowertrain.com
Thermo-mechanical fatigue
PLAST
Local plasticity
Magna Steyr India Pvt. Ltd.
Survey No. 55, Hissa No. 1 Bavdhan Khurd
Dist-Pune- 411021
Phone +91 20 6675 1000
E-mail: simon.dobson@magnasteyr.com
BREAK
Static safety factors
STRAIN
Virtual strain gage/
Measured strain damage
FEDIS
Sub-modeling
Event Calendar
Engine dynamics/Acoustics
simulation
Analysis & preparation of data
Publisher's Information:
Engineering Center Steyr GmbH & Co KG
Steyrer Strasse 32, 4300 St. Valentin, Austria
Tel: +43 7435 501 303,
Fax: +43 7435 501 300
a.schmidthaler@ecs.steyr.com
4
SF2M Conference “Fatigue and Plasticity”
2. Conference f. Applied Optimization in Virtual Prod. Develop.
SCT 2008
Symp. Structural Durability/LBF
FEMFAT Roadshow Berlin
FEMFAT User Meeting Japan
RELMAS St. Petersburg
FISITA Munich
ISMA Noise and Vibration Engineering Conference
17th Aachen Colloquium Automobile and Engine Technology
35th Conf. of the DVM Working Group on Operat. Strength
FEMFAT Roadshow Bologna
FEMFAT User Meeting North America
SIMVEC - Calculation and Simulation in Vehicle Engineering
FEMFAT Roadshow Aachen
Paris
Karlsruhe
Wiesbaden
Darmstadt
Berlin
Nagoya
St. Petersburg
Munich
Leuven
Aachen
Sindelfingen
Bologna
Troy
Baden-Baden
Aachen
20.-22.05.2008
03.-04.06.2008
01.-05.06.2008
05.-06.06.2008
10.06.2008
19.06.2008
24.-26.06.2008
14.-19.09.2008
15.-17.09.2008
6.-8.10.2008
8.-9.10.2008
4.11.2008
6.11.2008
26.-27.11.2008
16.12.2008