United States Department of Transportation
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Developing Finite Element Models to Examine Rail Defects under Combined Loading
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2019-04-10
[PDF-558.61 KB]
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NTL Classification:AGR-INFRASTRUCTURE-Railroads;NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION;
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Abstract:This paper lays out a framework for examining individual modeling techniques employed in the model, using a “building block” approach. Rather than trying to assess the entire model of a wheel on a discretely-supported rail containing an internal defect against a test measurement of the same conditions, the model is broken down into several key behaviors that must be verified. These distinct model behaviors, such as the method of discrete support, are then individually compared to known results to develop confidence in the simulation’s ability to produce physically-realistic results. In this way, confidence can be developed in the overall, complete model by developing confidence in several of the distinct modeling techniques that are employed in the overall model. The modeling techniques described in this paper include modeling the discretely-supported rail under a wheel load, modeling the internal defect as a crack, and using a submodeling technique to combine areas of coarse and fine mesh in a computationally-efficient manner.
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