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As a company we have been dedicated in the designing, manufacturing and calibrating of instrumented wheel sets for railways& public Transportation). Our instrumented Wheel sets Designed and Calibrated are individually designed for arbitrary wheel geometries and are reliable with high accuracy and bandwidth.
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In the concept and design development of elastomeric elements, the focus must be on the interfaces in addition to the required stiffness and service life for the component. In particular, the axles should be able to bear static special load cases without breaking. Here, the boundary conditions should be realistically depicted, and in particular the screw pre-tensioning force and the correct relative stiffness of brackets are of immense importance for the analysis. Furthermore, the contact conditions between the components are considered to obtain details regarding the realistic deformation and stress states in the analysis. For special load cases, an elastic-plastic analysis can be carried out in order to exploit the load carrying capacity of the component.
For drawing the Haigh diagrams, mostly single-stage, uniaxial Wöhler tests are carried out with test specimens. The specimens should have an appropriate size and a clear damage point to ensure a high reproducibility of the results. The Haigh diagram can be viewed as a Wöhler line set under various loads (mean load and amplitude). As strength hypothesis for elastomers, with which the stress on the component is converted into a reference value which is in direct relation with the material failure, the concept of the greatest principal stress and elongation has proved successful, wherein the method of critical cutting plane can be brought to application.
The most important milestone in the development process is the service life test. In particular, for safety-critical components, it is a common practice today to perform multi-axial dynamic service life tests, which should help ensure that the component may be used for field operation. The test may extend over a period of several days to a few weeks, whereby the smallest of errors in the design may lead to a premature failure of the components. For the statistical validation, at least two components have to be tested, often with an analysis of the test results according to the Weibull method, which is also offered and conducted by IB-CM (keywords: ‘Success Run’, lifespan, failure slope, reliability, confidence level of the entire set).
The most important milestone in the development process is the service life test. In particular, for safety-critical components, it is a common practice today to perform multi-axial dynamic service life tests, which should help ensure that the component may be used for field operation. The test may extend over a period of several days to a few weeks, whereby the smallest of errors in the design may lead to a premature failure of the components. For the statistical validation, at least two components have to be tested, often with an analysis of the test results according to the Weibull method, which is also offered and conducted by IB-CM (keywords: ‘Success Run’, lifespan, failure slope, reliability, confidence level of the entire set).