Composite News

Seminar program 2018

Would you like to refresh your knowledge of current norms and testing standards, of operational strength behaviour or of the design and simulation of components made of fibre-reinforced plastics? You would like to expand your expertise regarding the curing of resin-hardener systems made of PE and VE resins? Would you like to exchange ideas with other users in the field of materials testing of composites? Then you should not miss the next professional seminars at Grasse Zur Composite Testing!

The seminars offer time and opportunity to make contacts, to bring in your everyday challenges and questions and to discuss them in the sense of an exchange of experiences. The discussions can be continued over dinner in a pleasant atmosphere. Afterwards, it is possible to extend the stay with an interesting weekend in the capital Berlin. For more information and to register, click here!

The seminars are aimed at beginners and experienced materials engineers and include the following topics for 2018:



Composite News

Determination of shear properties: comparison of different test methods for a special price!

As the end of the year slowly approaches, you may also have some funds left over in your project budgets that you would like to invest wisely. We would therefore like to draw your attention to this year’s special offer for the comparison of the common methods for the determination of shear parameters. The test programme includes the testing of your materials according to the following standards:

Shear test with specification of shear stiffness, shear strength and max. shear strain

  • 5 tests according to DIN EN ISO 14129 („shear tensile test“)
  • 5 tests according to ASTM D 7078 („Rail-Shear-Test“)
  • 5 tests according to ASTM D 5379 („Iosipescu test“)
  • 5 tests according to DIN SPEC 4885 („Push frame test“)

In addition, you will receive information on curing and thus on the available curing reserve free of charge when placing an order:

Determination of the current and the maximum glass temperature by means of DSC

  • 3 tests according to DIN EN ISO 11357

The offer includes the production of test specimens from material provided, the application of strain gauges, the measurement of the test specimens, the performance of the material tests and the preparation of meaningful test reports. The tests are carried out at room temperature; tests at elevated temperatures are also possible for an additional charge.

You do not find the right material tests for you? You would like to condition the test specimens in advance? You would like to carry out a personalised test programme or use other test standards? No problem: Contact us and we will realise your wish!

Summary of the offer

  • We determine the shear characteristics on your material for you according to various standardised procedures.
  • The service includes testing according to DIN EN ISO 14129 („shear tensile test“), ASTM D 7078 („rail shear test“), ASTM D 5379 („Iosipescu test“) and DIN SPEC 4885 („shear frame test“).
  • You supply the material as a laminate or sheet, and we carry out the material tests in our test laboratory for you in their entirety, from the preparation of the test specimens to the dispatch of the tested specimens.
  • The informative test reports contain all relevant data and photos including shear strength, shear stiffness and max. shear strain including the corresponding stress-strain curves. On request, the raw data can be supplied free of charge.
  • The delivery time is approx. 8 weeks.
  • The offer is valid until 01.12.2017 (latest order date, offer will not be extended).
  • The saving is 25 %.



Composite News

Composites Europe 2017 in Stuttgart – meet you there!

Grasse Zur Composite Testing is going to exhibit at the most important trade fair for composite materials in Germany and beyond! Composites Europe is the most modern and innovative trade fair in the composites market. The fair established itself as one of the mayor industry events in europe and being the meeting place and network platform for the entire sector, it invites the whole composites community into the growth driver country of Europe. The international visitors meet exhibitors covering the complete process chain: Material solutions, lightweight concepts as well as latest production and automatisation solutions are shown for mastering your construction challenges of the future – covering all industrial applications such as building and construction, wind energy, automotive as well as aerospace technology.

Grasse Zur Composite Testing designs new testing systems for composite testing and runs an innovative test lab for material testing services at the place of business in Berlin. The testing systems are used for industrial research and development, for validating FEM simulations and for quality control in production.

At the Composites Europe 2017 we introduce the new Ultrasonic Measurement Device GZ US-Plus. The testing device is applicable for cure control of non-reinforced and reinforced thermosets and can be used in research and development of new material systems as well as in-process quality control. Many suppliers to the automotive and aerospace industry already use the system successfully as it increases process reliability due to its standardized routine on the one hand and on the other hand reduces costs significantly by saving cure time.

In addition to the testing devices, Grasse Zur Composite Testing offers a fullservice package for material testings of GFRP and CFRP. The tests are carried out in our in-house laboratory. In collaboration with our clients we specify the wishes and requirements regarding the determination of material parameters. The customers benefit from a complete process from a single source.

We are looking forward to your visit and to talking to you about composite testing. Meet us at our exhibition stand in Hall 4 / Booth E28!



Composite News

In-plane shear test methodologies for fiber-reinforced polymers

Strength, lightness, stiffness and durability are some of the reasons why fibre-reinforced polymers (FRPs) are increasingly being employed in many engineering sectors. As the research for new material configurations, the development of automated manufacturing techniques and the range of applications continue to rise, innovative and improved testing methodologies need to continuously be developed in order to optimise their analysis and design. Therefore, reliable testing methodologies which are able to take into account the complex material behaviour of composites are required.

Together with the tensile and compressive mechanical properties of composite materials, the in-plane shear properties also play an important role. In this case, the loading direction is not along the fibres and, therefore, the anisotropy of these materials is highlighted. The strength of the material decreases when the loading direction is shifted and, consequently, not only depends on the reinforcing fibres, but also on the interaction between the fibre/matrix.

Regarding the determination of in-plane shear properties, several test methods are widely used. These generally include the short beam shear (ASTM D2344), the Iosipescu shear (ASTM D5379), the ±45° tensile shear (DIN EN ISO 14129), the torsional tube shear (ASTM D5448), the two- and three-rail shear (ASTM D4255) and the V-notched rail shear (ASTM D7078).

The extensive variety of testing methods is due to the difficulty in determining the in-plane shear properties of composite materials by means of a pure and uniform shear distribution throughout the test specimen up to failure. Therefore, each methodology presents its own advantages and disadvantages.

At Grasse Zur Composite Testing, an experimental comparison between three different test methodologies used in the characterisation of the in-plane shear response of composite materials has been undertaken. These are the ±45° tensile shear, the V-Notched rail shear and the newly developed shear frame from Grasse Zur Composite Testing (DIN SPEC 4885).

Read the full paper by Dr. Francesc Cobos here.



Composite News

Aerospace Innovative – plastic meets aerospace

On 31 May 2016, the conference „Aerospace Innovative – plastic meets aerospace“ will take place at the Aerospace Centre in Wildau near Berlin. The organisers of the conference, which will focus on the latest information from the areas of engines, lightweight composite materials and sensor technology as well as the development of new cooperations, are the Berlin-Brandenburg Aerospace Allianz e.V., the Plastics and Chemistry Cluster Brandenburg (ZAB) and the Saxony Economic Development Corporation.

The programme includes three parallel sessions on the topics of engine technology or plastics technology and lightweight design and brings together experts from research, development and manufacturing. We are pleased to participate in the conference with a contribution on „Innovative process control and quality assurance using ultrasound in the manufacture of composite components“.

Further information on registration and the programme can be found on the website of the Plastics and Chemistry Cluster Brandenburg. Participation is free of charge. We look forward to the professional exchange and lively discussions with you!



Composite News

Overview of seminars 2016

In cooperation with Novak Composites, we’re offering a few interesting professional seminars and advanced trainings about the subject Composites in 2016. The seminars are taking place in our head office in Berlin and generally consist of a theoretical and a practical part, including the experimental testing of composite materials. Please note that we have limited numbers of participations to guarantee a higher standard for the workshops.

The seminars regarding strain gauge application works in cooperation with Preusser Messtechnik. Therefore we’re using strain gauges and other products from TML, which are necessary for the application of strain gauges on samples based on fiber-reinforced synthetic material.

We’re offering limited numbers of participation for students at reduced prices. Just contact us. We’re looking forward to your application!

June

September

October

November

  • 10.-11.11. Classical laminat theory (CLT) with experimental determined characteristics
  • 17.-18.11. Workshop strain gauges



Composite News

Trainings and technical seminars at Grasse Zur Composite Testing

From April 2016, we at Grasse Zur Composite Testing will be offering training courses and professional seminars on the subject of testing fibre-reinforced plastics. We would like to cordially invite you to the „Professional Seminar on Strain Gauge Technology“:

  • This training covers the technology and application of strain gauges on fibre-reinforced plastics and consists of a theoretical and a practical part, which also includes material testing on universal testing machines.
  • The training will take place on 14 and 15 April 2016 at our new offices in Berlin.
  • Please note that the number of participants is limited to ensure a high level of training.
  • The next professional seminar on strain gage technology will take place on 2 and 3 June 2016.

The training courses take place in cooperation with Preusser Messtechnik. Strain gauges and other products from TML are used, which are necessary for the application of strain gauges on test specimens made of fibre-reinforced plastics.

For further information, please see the information sheet. We look forward to your registration!



Composite News

Job advertisement for working student

At our location in Berlin, we are looking for a student trainee in the field of mechanical engineering / transport engineering to work in our company for 60 hours per month with immediate effect.

Specialist information can be obtained from Dr. Grasse by phone on +49 30 7790791-50 or by email at fabian.grasse@grassezur.de. We look forward to receiving your application!

Job advertisement (PDF)

Your tasks

  • Preparation of test specimens for material testing (strain gauge application, bonding of doublers, measurement of test specimens)
  • Carrying out material tests on electromechanical and servo-hydraulic testing machines (tensile test, compression test, bending test, shear test, etc.)
  • Creation of test procedures and evaluation algorithms
  • Preparation of test protocols
  • Development of small test fixtures and auxiliary devices

Your profile

  • Engineering degree with a focus on mechanical engineering, transport engineering, lightweight design or materials technology
  • Very good technical knowledge in the areas of materials testing, fibre-reinforced plastics and/or 3D-CAD (ideally Solid Edge)
  • Good written and spoken English
  • Independent and responsible working style, high degree of independence
  • Skilled craftsmanship

We offer

  • Working in a young and dynamic company in a fast-growing market
  • Flat hierarchical structures, short communication channels and freedom to develop your own ideas
  • Possibility of writing a bachelor’s or master’s thesis



Composite News

Determination of shear properties by use of a picture frame approved by DNVGL

The safety and reliability of wind turbines is of the highest priority. To ensure this, DNVGL has developed and published guidelines for the approval of wind turbines that have international significance. As a classification society in the fields of technical consulting, engineering services, certifications and risk management, DNVGL is recognised worldwide.

In December 2015, the newly revised DNVGL standard „Rotor Blades for Wind Turbines“ (DNVGL-ST-0376) was published, in which the shear test method using shear frames according to DIN SPEC 4885 is now approved as a test method. This is an important milestone for the shear test method using shear frames and represents progress in the material testing of wind turbine rotor blades. For example, significantly higher material parameters can be achieved with the DIN SPEC 4885 method, as the maximum shear strains are not limited to < 5 % due to the method. This can be of enormous importance for materials that have already been approved and must continue to reliably achieve defined minimum characteristic values.

The innovative shear test method using shear frames is increasingly establishing itself as a reference method, as it offers some significant advantages over existing methods (for example DIN EN ISO 14129 or ASTM D7078). Now the method is not only technically very well suited for use in the wind energy sector, but has also been officially approved by DNVGL with its publication in the new standard for the design of rotor blades.

The test method is standardised as DIN SPEC 4885:2014 and is available free of charge from Beuth-Verlag.



Composite News

Delegation of DIN hosted by Grasse Zur Composite Testing

Around a year after Grasse Zur Composite Testing had been awarded with the DIN Innovation Award 2014, a delegation of DIN, namely the Chairman of the Managing Board Dr. Torsten Bahke, Head of Communication Mr Ahle, Executive Director of Standards Committee of Material Testings Mr Seibicke and Project Manager of Standards Commitee of Material Testings Mr Anik, visited Grasse Zur Composite Testing in their business premises in Berlin-Zehlendorf. There they learned about the current development of products of the company and about future plans and objectives of the company.

Grasse Zur Composite Testing continues to develop novel testing methods for fiber reinforced composite materials. Usually, after a successful market launch, a standardisation in collaboration with DIN is pending. The benchmark is DIN SPEC 4885: After a processing time of six weeks only, the specification of the innovative testing method “Fibre-reinforced plastic composites – Shear test method using a shear frame for the determination of the in-plane shear stress/strain response and shear modulus” was published in January 2014. The base of the novel shear testing system is a shear frame technology, formerly developed under the lead of Prof. Volker Trappe, that was adopted, improved and transferred into industrial application by Grasse Zur Composite Testing from the BAM Federal Institute for Materials Research and Testing.

The visit of DIN emphasises the benevolent cooperation with Grasse Zur Composite Testing. The DIN commitee regards itself as more than just a permission authority and provides the company with advice and practical help. The still novel product “DIN SPEC” is a specification especially designed for new developments and thus made for companies like Grasse Zur Composite Testing that constantly enhance already existing or create novel testing methods. A shortened procedure duration provides the standardised test method much faster which sustainably increases the effectivity of knowledge transfer.

Word has spread of the high quality of the testings at Grasse Zur Composite Testing: The client base still includes the very first customers and has opened up to many more from new branches of industry.  Furthermore the field of activity is constantly being broadened. Thus all the signals point to expansion: Moving into larger premises (same adress) is scheduled to begin shortly and the team has grown with two more permanent employees.