Tribological
Tests

Since we have a wide base for testing at our disposal, we can design a testing plan, and hold the tests for various friction pairs. The Modengy’s testing center running in Bryansk has capabilities that enable to predict operational properties of the friction units early on the designing stage. We help the industrial enterprises estimate such important parameters as friction coefficient, wear intensity, frictional heating.

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What does this service include?

  • Data collecting to make up the technical specification
  • Analysis of the currently used solutions and testing techniques
  • Design documentation and experiment outline development
  • Experiment holding
  • Analysis of the results, and drawing up of accounts
  • Detailed report, and engineering and design recommendations on optimizing the friction unit that are provided to the customer
  • All the rights for the test results pointed in the report are transferred to the customer

Types of the tests

On the stage of designing new items, or modifying the structure of those one that are currently release, the task of predicting their operational properties arises, particularly, their service lifetime and power efficiency. These rates are defined first of all by the performances of the friction units in the structure of the items, and their elements including wear resistance, and friction coefficient. For the purpose of collecting information about these performances, the laboratory tests are held as a part of the rational testing cycle (RTC), according to GOST 30480. In accordance with the mentioned GOST, ‘a compulsory stage of the rational testing cycle is revealing compatibility limits of the given friction pair under laboratory conditions, estimating its friction-and-wear features in the way applicable to the real life operational modes of the friction unit under question, and detecting the critical points based on these tests results’.

The tests according to ASTM G99 Standards

The schemes with the focused contact such as the ‘sphere-surface’, or the ‘pin-surface’ scheme are used for comparative tests at the present. Use of them enables to eliminate the setting errors of the sample and the opposite element, to shorten the running-in period at the macro-level, to cut down time for the tests, and to gain the result faster.
At the Modengy’s testing center the tests for friction and wear are held according to ASTM G99 Standards. The following tasks are solved during the tests according to this standard:
  • Matching the optimal friction pair for the given operational conditions
  • Measuring friction coefficient in the friction pair, and its change dynamics
  • Detecting wear resistance of the friction pair
  • Detecting friction and wear features of the coatings
  • Revealing various factors impact onto the characteristics of the tribological conjunctions (contact pressure, slide rate, operational medium type)
  • Detecting anti-friction and wear-resistant properties of the lubricating materials
  • Measuring frictional heating temperature
  • Modeling the friction unit operating
  • Researching the running-in ability characteristics


The tests according to the Reichert method

Such scheme of testing is intended to assess anti-wear and anti-scuffing properties of the constructive and lubricating materials. This test is especially topical in the fields of industry where lubricating materials are used under conditions of increased loads.

The tests according to the Reichert method are used for both quality control, and to research new lubricating materials.

According to the results of these tests value of linear wear on the fixed roller is detected, and value of linear wear intensity of the counterbody is calculated as the ratio of the linear wear to the friction path.

The currently used equipment is provided with the automated control and data registering systems. The test stands have been verified and certified at the authorized methodological center.

Testing threaded fasteners with more advanced separated analysis of friction coefficient

The Modengy Test Center holds tribotechnical trials to detect torsion torque and pre-tightening forces of the threaded fasteners, friction coefficient in the thread, friction coefficient on the bolt or nut supporting surface, general friction coefficient, and twist coefficient.

Friction in the threaded connections affects significantly the process of assembly and operational reliability of the threaded fasteners. To study the friction processes between the turns of a nut and a bolt (stud) for the purpose of reaching optimal tightening in the connection, the test bench certified to meet the GOST ISO 16047-2015 requirements has been installed at the Modengy Test Center.

The uniqueness of this test bench is in its capacity to measure not only general friction coefficient but also separately friction coefficient in the thread, and on the bolt or nut supporting surface.


Due to obtaining these data, it appears possibility to calculate with high accuracy tightening torque of the threaded fasteners for especially critical structures according to many Russian and foreign standards, for example, such as ASME-PCC-1 that recommend to carry out calculations taking into account friction coefficients of two kinds.

It is possible now to diagram and analyze in the real time mode the graphs of Ктр dependency from tightening, examine in dynamics the impact that lubricating materials and various coatings have upon tribological characteristics of the threaded connection.



The process of tightening the threaded connections on the bolted connection test bench is automated, and due to this, uniform tightening without errors is provided which is not available at the test benches with manual bolt tightening.

Online broadcasting of the testing process
Due to Modengy’s new service – online broadcasting of the testing process – this service has got more informative and clear.

Now, the partners can watch fulfilling their orders in the real time mode. More than that, there is an opportunity to observe both the process itself, and its results which are displayed on the friction machine screen.

When the laboratory tests are held on the stage of designing the item it enables to select the optimal materials and coatings for the friction pairs taking into account the limits of their applicability, to predict their service lifetime, and to estimate other operational properties within the shortest possible term. While analyzing this or that friction pair, the experts of the Modengy’s testing center consider it at the first place as a system with the multiple elements, and the external impacts they are subjected to.

Due to use of the system approach, it gets possible to achieve the required output parameters such as friction coefficient, and wear intensity by changing the certain system elements in a desirable direction.

If you are interested in holding tribotechnical tests, apply to the Modengy company, please.