Analysis of the Transferability of the Systematic Error of Pressure Measurement Films Under Hertzian Conditions to Wheel-Rail Normal Contact

接触体是机械工程中众多机械元件的基础，在多种应用中对功能和安全要求起着至关重要的作用。这种说法特别适用于传统的轨道车辆，因为轮轨接触面是车辆和轨道之间唯一的机械界面，它对支撑力、导向力、驱动力和制动力起作用。因此，需要对接触块的形状和尺寸以及其应力和应变状态有充分的了解。虽然计算机辅助计算提供了一个很好的洞察所得的接触表面的属性，这些都不是结论性的，没有适当的实验验证。然而，目前还没有一种用于轮轨接触表面实验测定的方法。然而，根据申请人现任和前任主席长期以来获得的知识，可以说，如果系统测量误差已知，使用市售压力测量膜进行实验接触表面表征是一种非常有可能的方法。在本项目中，将研究压力测量膜的测量误差的可传递性，该测量误差仅针对可解析计算的物体而确定，该可传递性用于实际的轮轨法向接触。根据另一个项目的研究结果，现有薄膜模型的材料参数将通过实验设计进行调整，以重现已知的系统偏差。随后，这些薄膜模型应在数值轮轨模型中实现。然后，通过与实际轮轨轮廓组合的实验观察结果进行比较，验证从这种情况下的模拟获得的接触表面。

Contact bodies represent the basis of numerous machine elements in mechanical engineering and play a critical role regarding functional and often safety requirements in several applications. This statement applies especially to conventional rail vehicles, since the wheel-rail contact surface is the only mechanical interface between vehicle and track, which reacts support, guiding, driving and braking forces. A sound knowledge of the shape and dimensions of the contact patch, as well as its stress and strain state, is hence required. Although computer-aided calculations provide a good insight into the properties of the resulting contact surface, these are not conclusive without appropriate experimental validation. However, no method for the experimental determination of wheel-rail contact surfaces has established itself yet.Nevertheless, based on the long-standing knowledge acquired at the current and previous chair of the applicant, it can be stated that using commercially available pressure measuring film is a serious possibility for experimental contact surface characterization, provided that the systematic measurement error is known.In the context of this project, the transferability of the measurement error of pressure measurement films, which has only been determined for analytically computable bodies, to the actual wheel-rail normal contact is to be investigated. Based on the findings of another project, the material parameters of existing film models are to be adjusted by means of design of experiments in order to reproduce the known systematic deviation. Later, these film models shall be implemented in numerical wheel-rail models. The contact surfaces obtained from the simulation of this scenario are then to be validated by comparison with experimental observations with actual wheel-rail-profile combinations.