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2022-04-13 New PERMAS Presentation: Is Bolt Loosening Based on Advanced Pretension Functionality Predictable? on YouTube
PERMAS Advanced Bolt Loosening Simulation
The lecture "Is Bolt Loosening Based on Advanced Pretension Functionality Predictable?" shows the ability of PERMAS to provide detailed results for bolt thread connections with simple bolt modeling. The new method is intended to be used with multi bolt models.
The presentation is now available in an edited version on YouTube: Is Bolt Loosening Based on Advanced Pretension Functionality Predictable?.
Do you have any questions about the lecture or PERMAS?
We look forward to your call or email.
Tel.: 0711 78499-18
E-Mail: info@intes.de
2022-02-16 The GACM reports on PERMAS for Education
News about PERMAS for Education from GACM.

Die German Association for Computational Mechanics reports on PERMAS for Education.

The German Association for Computational Mechanics (GACM) is a non-governmental association. The objective of GACM is to stimulate and promote education, research and practice in computational mechanics and computational methods in applied sciences, to foster the interchange of ideas among various fields contributing to computational mechanics, and to provide forums and meetings for the dissemination of knowledge about computational mechanics in Germany.
2022-02-02 Call for Papers for the 2. PERMAS Web-Users' Conference
Call for Papers for the 2. PERMAS Web-Users' Conference (June 29 - July 14 2022)

The next PERMAS Users’ Conference will also take place as a virtual meeting.

We cordially invite you to talk about your applications and experiences with PERMAS/VisPER. Whether new or proven simulation topics, every area of application offers interesting aspects that deserve it to be exposed. We look forward to each of your suggestions.

We ourselves would also be curious to learn more about your experiences with e.g.:
  • Contact (multigrid),
  • Optimization,
  • Dynamics and fluid-structure acoustics,
  • Design of electric vehicles or
  • Nonlinear material.

A lively exchange of experiences is driven from your contributions. INTES will do its best to create a pleasant atmosphere during the event.

The complete Call for Papers with all details is available here: Call For Papers.

For questions and fourther information please use: wc2022@intes.de
2021-12-16 No Log4j in INTES Software
As reported in the media, there is currently a critical security vulnerability that was discovered in the Java package "log4j" a few days ago.
The Federal Office for Information Security (BSI) classifies this security gap with the highest warning level.
We have checked our products intensively. Neither PERMAS, VisPER nor our tools use Log4j and are therefore NOT affected by this security vulnerability.
2021-07-28 New Presentation PERMAS Computes Highly Nonlinear Structures on YouTube
PERMAS Computes Highly Nonlinear Structures
The lecture "PERMAS Computes Highly Nonlinear Structures" was presented at the PERMAS Tech Meeting in April.
The presentation is now available in an edited version on YouTube: PERMAS Computes Highly Nonlinear Structures.
Do you have any questions about the lecture or PERMAS?
We look forward to your call or email.
Tel.: 0711 78499-18
E-Mail: info@intes.de
2021-07-21 Flyer Simulation process chains with PERMAS
A joint process of different disciplines is important for a simulation driven design process. To improve product performance, correct data of different disciplinces may by integrated in a numerical optimization with PERMAS.
Special thanks to STIHL for the permission to release this information.
All information is on our new simulation process chains with PERMAS flyer.
Do you have any questions or you would like to get more information, don't hesitate to contact us:
Tel.: +49 711 78499-18
E-Mail: info@intes.de
2021-06-21 New PERMAS Distributor in China
We are glad to welcome Wuhan Yixingyun Technology Co., Ltd. as new PERMAS distributor in China. We wish best success.
2021-03-17 Invitation to attend the PERMAS Tech Meeting April 2021
We cordially invite all PERMAS user to our PERMAS Tech Meeting on April 22nd, 2021 at 9:30 a.m.
In three lectures we will show a variety of technical applications on current PERMAS and VisPER topics. The event will be online and compact in one morning. Each lecture will last about 30 minutes. Questions will be highly welcome directly after the lectures. Since all international PERMAS users can also benefit from the information online, the lectures will be held in English.
In a discussion and feedback round after the presentations, the presenters will answer the questions and suggestions from the chat.
Participation in PERMAS Tech Meetings is free of charge for you. We ask for an informal registration by email to: tm2021@intes.de . Registration closes on Monday, April 19th. You will then receive an invitation with a link to the conference.
We look forward to your participation.

Detailed Invitation with all information as PDF.

2021-02-18 INTES posts on LinkedIn about contact analysis
INTES LinkedIn CA-Post No. 1
INTES has started a series of five posts about PERMAS contact analysis on LinkedIn.

Contact Analysis? - PERMAS
Do you want to save modelling time by automatic meshing? Specific interpolation schemes will give good stresses also for coarsed (corner node based) contacts.
Are missing initial penetrations hard to handle? This is a frequent problem of contact solvers.
What about contact and large deformations? See animation for an example.
All five pages with a lot of informationen about contact analysis are on our new contact analysis flyer.
Please check also our flyer about Contact Analysis - Fast and Accurate.
Do you like to get all information by presentation? Here is the video Next Generation Contact Analysis.
This link leads you directly to our INTES LinkedIn page. We look forward to every new follower.
Do you have any questions or you would like to get more information, don't hesitate to contact us:
Tel.: 0711 78499-18
E-Mail: info@intes.de
2021-01-20 New PERMAS Distributor in China

We are glad to welcome Numeritec China technology Co, Ltd. as new PERMAS distributor in China. We wish best success.

2020-11-15 Flyer Contact Analysis Deep Facts
On a five pages flyer we present the outstanding performance of PERMAS contact analysis.
All five pages with a lot of informationen about contact analysis are on our new contact analysis flyer.
Do you like to get all information by presentation? Here is the video Next Generation Contact Analysis.
Do you have any questions or you would like to get more information, don't hesitate to contact us:
Tel.: +49 711 78499-18
E-Mail: info@intes.de
2020-09-15 PERMAS4EDU on ResearchGate
Have you already seen our interesting projects on ResearchGate?
The projects are related to publications on ResearchGate and show how these are solved with PERMAS. You can calculate all examples with PERMAS4EDU.
You can find more information about PERMAS4EDU on our Flyer PERMAS4EDU or on PERMAS4EDU homepage.
You can find more information about PERMAS4EDU and videos with instructions on YouTube in our PERMAS4EDU Playlist.
Would you like to register for PERMAS4EDU immediately and download it for free? Go straight to our Registration.
Do you have any questions or you would like to get more information, don't hesitate to contact us:
Tel.: +49 711 78499-49
E-Mail: info@intes.de
2020-07-15 Flyer Contact Analysis (Fast and Accurate)
On this new flyer we present the outstanding performance and accuracy of PERMAS contact analysis.
Two pages with a lot of informationen about contact analysis are on our new contact analysis flyer.
Do you like to get all information by presentation? Here is the video Next Generation Contact Analysis.
Do you have any questions or you would like to get more information, don't hesitate to contact us:
Tel.: +49 711 78499-18
E-Mail: info@intes.de
2020-07-10 PERMAS4EDU
PERMAS4EDU is the ideal tool to become acquainted with the software or to be used in academic coursework on the Finite Element method. You can get to know the outstanding properties of PERMAS and the wide range of applications with PERMAS4EDU. The model editor VisPER is also included. PERMAS4EDU thus covers the entire process chain from the FE mesh to evaluation.
You can find more information about PERMAS4EDU on our Flyer PERMAS4EDU or on PERMAS4EDU homepage.
You can find more information about PERMAS4EDU and videos with instructions on YouTube in our PERMAS4EDU Playlist.
Would you like to register for PERMAS4EDU immediately and download it for free? Go straight to our Registration.
Do you have any questions or you would like to get more information, don't hesitate to contact us:
Tel.: +49 711 78499-49
E-Mail: info@intes.de
2020-06-29 PERMAS Version 18 available
We are glad to announce that the new PERMAS/VisPER V18 is now available for our customers.

PERMAS V18 includes new functionalities like
  • CAMG, the new generation of contact solvers and
  • NLSA, which allows the simulation of hyperelastic behaviour of material,
as well as numerous innovations, enhancements and improvements which have been integrated in a release note.

Furthermore, we offer V18 Upgrade training in order to work with the software efficiently.

We hope you can use our software with pleasure and good success.
2020-06-16 PERMAS Web Conference 2020 Additional Date
The PERMAS Web Conference series has been extended by one additional date on July 8, 2020. On this date, one lectures and one live-demonstration will be held on the topic of "Design by Simulation". You can find all information about the dates and registration here: Web Conference.
2020-05-07 PERMAS Web Conference 2020 next event
The PERMAS Web Conference series started on May 6, 2020. Regular events are planned until July 8. You can find all information about the dates and registration here: Web Conference.
Next: Wednesday, July 8, 2020, 9:30 AM (CEST): Design by Simulation
2020-04-16 Invitation to attend the PERMAS Web Conference 2020
We cordially invite you to our web conference series where users and developers together present a varied program at regular dates, inviting you to a vital exchange. The current version of the program is visible here: Web Conference. It is still subject to change.
Starting from May 6th, we will discuss on Wednesdays a dedicated topic at 9:30 am (CEST) for about 1.5 hours and look forward to your participation as well as a lively exchange with you.
Participation is free of charge. We kindly ask you to register informally
by email to: uc2020@intes.de - for all dates in a single email or individually for each date. Registration closes on Monday before the respective web conference date. You will then receive an invitation to the current date with a link to the conference. (We host the conference on our own servers!). The number of participants is limited for technical reasons. We will use the order of registrations.
We recommend google Chrome / Microsoft Edge (Chromium) as a browser. (Firefox is also possible for participants). You do not need any software installation. In order to take part in the discussion, you need a microphone - in addition there will be a chat option.
2020-03-23 We are here for you!
We all are facing an extraordinary situation.
We have reduced our physical office presence in combination with home office in order to protect the health of our employees and to guarantee at the same time the quality of our services.
It is important for us to keep economy alive and to minimize the consequences of this crisis, as far as possible.
This also includes advancing our joint projects and to continue to ensure your operational safety and to be well equipped for the future.
Therefore, we ensure our services for you, so that you are able to stay productive:
-All contact partners of our company are available via the well-known communication channels, regardless whether they are on site or working in the home office.
-Our support is fully available by phone, e-mail and our ticket system.
-We offer training by video-conferencing.
Should you face new process or IT challenges due to the current situation, we are happy to help you. Unusual situations require creative solutions. We can help you with that.
We wish you, your families and your company the best - please stay healthy.
Sincerely, your INTES team
2020-01-24 Invitation to attend the PERMAS Users' Conference
Since the current development of the corona pandemic continues to be dynamic, we have, with a heavy heart, no choice but to cancel the PERMAS Users´Conference 2020 for the benefit of all.
--
The original news:
The invitation to attend the PERMAS Users' Conference on April 23 - 24, 2020 in Stuttgart is online now.
The PERMAS Users' Conference will take place at the Filderhalle in Leinfelden-Echterdingen near Stuttgart. After a reconstruction, there is a modern convention hall at a beautiful location.
2020-01-16 New Workshops - Register Now!
English training courses for PERMAS are arranged on an individual basis. Therefore we offer the courses at any time convenient to you, provided that an instructor is available. We need to know about the date 8 weeks in advance for planning. So please suggest a date that suits you. Usually, the training takes place in our office in Stuttgart.
Please note that the language for the regular courses listed on the training page is German and that they take place in Stuttgart unless denoted differently.
We would be pleased to advise you on the ideal selection of training courses.
Organisation and information:
Claudia Krauss
Tel.: +49 711 78499-0
E-Mail: Claudia.Krauss@intes.de
2018-10-24 PERMAS to Simulate System Behavior of Milling Machines
A milling machine model with simulation results of circularity test,
stability chart generation, and response to a sudden jump.
The dynamic behavior of a complete machine tool including tools and workpieces is crucial for the development of such machines. The accuracy of the motion of tables and tools is absolutely essential for the accurate resulting surface shape of the workpieces. Fast positioning and fast machining are important, the first with very small to no vibrations and the latter with high cutting depths and no chatter.
The complete system comprises structural parts, drives of the various axes, their control, and rotating spindles. During the interaction of tool and workpiece, the dynamic forces are causing vibrations of the machine, which have to be damped out sufficiently by all system components. Finally, the machine tool should provide highest accuracy and cutting depth at high speed.
The FE (Finite Element) method is the standard method for numerical vibration analysis in many application fields. So, it is quite natural to use this method for complete machine tools. To this end, PERMAS contains control elements, which are prepared to model a typical machine control with displacement control, velocity control, and current control. In addition, other elements are used for spindle supports, which allow the modeling of speed-dependent stiffness and damping.
With all of these modeling features, PERMAS performs all dynamic analysis methods like real and complex eigenvalue analysis, frequency response analysis, and time-history response analysis. In particular, a numerical stability analysis of machine tools is available to predict stable process parameters and chatter frequencies.
The attached picture shows a milling machine model with simulation results of circularity test, stability chart generation, and response to a sudden jump.
The circulatory test is achieved by a time-history response analysis of a given table move starting at no speed using a limited jerk condition. The resulting move is almost a circle and shows very small deviations.
The response to a sudden jump is also calculated by a time-history response analysis, where the given table move is a sudden jump in X direction.
The stability chart is calculated with a force model for the interaction between tool and workpiece. The upper diagram shows the dependency of stable cutting depth on the spindle speed with the milling cutter. There, the maximum cutting depth for a stable process also depends on the rotating direction. The lower diagram contains the chatter frequencies dependent also on the spindle speed and its rotating direction.
Also turning machines can be analyzed in a similar way (see here).
PERMAS® is making realistic simulations practical. PERMAS® supports advanced product designs through effective and rapid optimization of complex situations. PERMAS® is an integrated FE analysis software combining thermo-mechanics, vibro-acoustics, and design optimization. For more information on PERMAS®, a Short Description is available. More detailed information may be obtained from the Product Description.
2018-09-21 PERMAS in the Cloud - A Cooperation of T-Systems and INTES

In CAE applications, flexible use of computer power is getting more important for many users. To meet this demand for PERMAS, T-Systems and INTES have concluded an agreement, which allows T-Systems to provide PERMAS to the users of the Open Telekom Cloud.

The Open Telekom Cloud, the public cloud product of Telekom, is available as hybrid cloud solution - and provides more security and higher speed on demand. In this way, the computing and storage capacities can be used on the certified and highly secured computing centers of Telekom in Saxony-Anhalt. On the other hand, enterprises may use the proven cloud resources also on dedicated hardware exclusively. This hardware can be placed in the computing centers of Telekom, which is used by enterprises through a secure connection, or Telekom installs the servers needed directly at the customers site.

INTES provides PERMAS with the pre- and post-processor VisPER with all functions on the Open Telekom Cloud. Users have greatest flexibility to use any PERMAS functions. In particular, this holds for the use of optimization, parameter studies, or reliability analysis, which will increase the demand for computing power considerably in the coming years. The highly performant implementation in PERMAS provides a very efficient use of cloud resources for such applications. Within the hardware capabilites provided, also the parallelization of PERMAS can be flexibly used, and compute-intensive jobs are run with highest performance.

"We are convinced that the use of PERMAS in the cloud is an important extension of our offering.", Reinhard Helfrich, Chief International Officer of INTES, said. "The easy access to resources, the efficient use, and the high security build the basis for an extension of CAE applications in enterprises. In this way, the importance of simulations in product development will grow significantly."

Because security aspects play a prominent role in cloud utilization, IT resources based on the open standard OpenStack may be also used by those enterprises, which are not using public cloud services. Enterprises may use the Open Telekom Cloud locally on dedicated systems abroad, either due to compliance or latency reasons. The certified Open Telekom Cloud fulfils the requirements of the European General Data Protection Regulation (GDPR).

More information can be achieved with the link to the Telekom Cloud.

PERMAS® is making realistic simulations practical. PERMAS® provides extremely fast and accurate solutions for realistic simulations of large models and complex situations in time. PERMAS® supports better product designs through effective and rapid optimization of complex situations. PERMAS® is an integrated FE analysis software. It combines thermo-mechanics, vibro-acoustics, and design optimization. For more information on PERMAS®, a Short Description is available. More detailed information may be obtained from the Product Description.

2018-03-07 Shape Optimization of Wheel Spokes to Survive Wheel Impact Test
Shape optimization using five shape basis vectors
For the homologation of alloy wheels, a number of standard tests have to be performed before such wheels are allowed to be used in cars. Such tests are bending fatigue test, radial fatigue test, and impact test. The latter test represents the inclined collision of a wheel and a curb at low speed, where the spokes are not allowed to crack. To pass this test at the first time successfully, previous numerical simulation and optimization can avoid late re-design and late start of production.
The impact test conditions describe a low speed impact on the rim, which can be handled as quasi-static analysis case. An elastic-plastic contact analysis is easily applied to compute effective plastic strains, where the results are taken after the potential energy of the falling mass is consumed by elastic and plastic deformations of the test rig with the wheel. The point of failure is defined, when the effective plastic strain exceeds the ultimate plastic strain of the material used.
When failure occurs, a shape optimization can be applied to reduce the plastic strain at the critical points. In addition, a special condition has to be fulfilled, which does not allow to make shape changes of the front view, because this is exclusively defined by the stylist. This is a very special manufacturing constraint for the optimization.
The attached picture shows the shape optimization of a wheel to survive the impact test. The initial model shows high plastic strains on the reverse side of the spokes with 11.9% and 4.9%. A parametric shape optimization of the reverse side of the spokes is performed taking the fivefold cyclic symmetry of the wheel into account. Three Shape Basis Vectors (SBV) are used for the outer radius of the spokes and two additional SBV are used for the inner radius of the spokes. The weight is used as objective and the effective plastic strain is used as constraint limited to 3.4% for the two highly strained locations on the spokes' reverse side. Convergence is achieved after three iterations with six loops each, which are used to calculate the derivatives for all five SBV for this non-linear optimization task. To reduce the plastic strains, the weight of the wheel has to be increased by 3.2%.
The set-up of the shape optimization is supported by the Shape Wizard in VisPER. Here, the SBV are specified and prepared for the later optimization with PERMAS. VisPER is also used for the result evaluation, where the history plots for constraints and objective are generated and the shape changes and resulting stress and strain fields are visualized. Additional history plots show the influence of the single SBV on the shape change.
Two animations about change of effective plastic strain and the coordinates on the reverse side of the spokes give a more detailed impression.
More details of shape optimization are described here and in the PERMAS Product Description.
PERMAS® is making realistic simulations practical. PERMAS® supports advanced product designs through effective and rapid optimization of complex situations. PERMAS® is an integrated FE analysis software combining thermo-mechanics, vibro-acoustics, and design optimization. For more information on PERMAS®, a More detailed information is available.
2018-02-06 Comparison of experimental modal analysis (EMA) with dynamic eigenvalue analysis
Example of a ladder frame with measured and computed natural frequencies.
The MAC matrix at top right side shows strong correlation for five modes.
For structures under dynamic loads, simulations and experiments are frequently used side by side. This leads to mutual benefits. On the one hand, simulation provides a means to identify preferred points to measure. On the other hand, experimental results can be used to identify differences between experimental and simulation model, which provide a basis for model updating to fit the test results by simulation.
One important comparison between experimental modal analysis (EMA) and Dynamic EigenValue analysis (PERMAS module DEV) is between measured and computed natural frequencies and between measured and computed mode shapes. While the natural frequencies can be compared directly, the comparison of mode shapes is usually made using MAC matrices (MAC - Modal Assurance criterion). To this end, each mode shape of the experiment is compared with each computed mode shape and vice versa. The values of a MAC matrix is between Zero and One. Values near One indicate a strong similarity of the mode shapes, while small values indicate different mode shapes.
PERMAS is capable to read model and results (from a Universal File) and to use them subsequently to generate and export directly the MAC matrix with the computed mode shapes.
The attached picture shows an example, which kindly has been made available by Prof. Dr.-Ing. Jörg Bienert of Ingolstadt University of Applied Sciences. He has determined the experimental results for the ladder frame structure, while the simulation and the comparison have been made by INTES. The location of the sensors does not fit to nodes of the FE mesh. So, interpolation regions were used to connect the sensor locations with the neighboured nodes of the FE mesh. By doing so, the computed results are available at the same points as the measured results and the comparison can be performed directly by generating the corresponding MAC matrix.
For the first three modes, the computed and measured natural frequencies and mode shapes are shown. We see from the MAC matrix that the modes four to seven were not available in the experimental results. The experiment used one-dimensional sensors, which perfectly detect displacements normal to the ladder frame. But the computed modes four to seven show displacements in the plane of the ladder frame, which are not detectable by the used sensors.
More information is available about the capabilites of PERMAS to perform eigenvalue analysis, either modal condensation and complex eigenvalue analysis or real eigenvalue analysis by Multi-Level Dynamic Reduction.
PERMAS® is making realistic simulations practical. PERMAS® supports advanced product designs through effective and rapid optimization of complex situations. PERMAS® is an integrated FE analysis software combining thermo-mechanics, vibro-acoustics, and design optimization. For more information on PERMAS®, a More detailed information is available.