On the accuracy of the pressure measurement film in Hertzian contact situations similar to wheel-rail contact applications

Dörner, Florian; Körblein, Ch.; Schindler, Ch.

doi:10.1016/j.wear.2014.06.010

Cited by 17 publications

(19 citation statements)

References 8 publications

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“…The use of pressure-sensitive films is one potential method to evaluate the contact area and pressure [ 11 , 12 ]. However, these films will change the tangential load due to their different frictional properties, and they act as a ‘gasket’ so change the load distribution in the interface.…”

Section: Introductionmentioning

confidence: 99%

In situ evaluation of contact stiffness in a slip interface with different roughness conditions using ultrasound reflectometry

et al. 2021

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Understanding the dynamic condition of the interface between a railway wheel and rail is important to reduce the risks and consider the effectiveness of countermeasures for tribological problems. Traditionally the difficulty in obtaining accurate non-destructive interfacial measurements has hindered systematic experimental investigations. Recently, an ultrasound reflectometry technique has been developed as a direct observation method of a rolling–sliding interface; however, the topography dependence under the high contact pressures in a wheel–rail contact has not been clarified. For this reason, a novel in situ measurement of the contact stiffness using ultrasound reflectometry was carried out for three different levels of roughness. A contact pressure equivalent to that in a wheel–rail interface was achieved by using a high-pressure torsion test approach. The dynamic change of contact stiffness with slip was measured using ultrasound and the influence of roughness was investigated. The measured changes were validated using a newly developed numerical simulation, and mechanisms to explain the observed behaviour were proposed in terms of fracture and plastic deformation of the asperity bonds. These findings could help in understanding the traction characteristics for different roughness conditions and also assist in understanding damage mechanisms better, such as wear and rolling contact fatigue.

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Section: Introductionmentioning

confidence: 99%

In situ evaluation of contact stiffness in a slip interface with different roughness conditions using ultrasound reflectometry

et al. 2021

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“…The measurement error of such films is reported to be approximately 10-15% for low contact pressure gradients [13]. It must be noted that the actual contact sizes are often overestimated by Prescale films [14].…”

Section: Contact Pressurementioning

confidence: 99%

Static model of a snowboard undergoing a carved turn: validation by full-scale test

et al. 2019

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The purpose of this study was to define a method for the validation of a numerical model representing a snowboard structure undergoing the conditions of a carved turn. A static load bench was developed to expose a snowboard to in-situ conditions. The deformed shape of the structure was measured with the use of retro-reflective markers, whose positions in space were tracked by six cameras and determined by triangulation. The experimental setup was idealized in a finite element model, representing the composite structure and the loading environment. The model was validated by comparing the measured and computed displacement fields. The congruence between the two deformed surfaces was expressed by statistical means and constitutes the target function for optimization frameworks. Additionally, the contact pressure at the ground interface was experimentally assessed with the use of pressure measurement tape and compared with the numerical predictions.

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“…7 Both investigations considered the influence on the contact patch on the driving surface, which explained the small and negligible changes. However, various authors were able to show, that the displacement between wheel and rail had a huge impact on the resulting contact patch shape and size as well as on the maximum pressure and pressure distribution (see numerous resources 7,9,13,18,19,27,30,65,67,68 ).…”

Section: Finite Element Analysis (Fea)mentioning

confidence: 99%

Overview of methods to identify the static normal wheel-rail contact

Stratmann

Goersch

Schindler

2021

Proceedings of the Institution of Mechanical Engineers, Part F:

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Determining the shape and size of a wheel-rail contact area is required to calculate fatigue and wear of wheel and rail. Fatigue and wear are influenced by high pressures of up to 1000 MPa that act on the small contact area of approximately 1 cm². One problem in identifying the contact patch is the inaccessibility of the contact point. Therefore, numerical and experimental methods have been applied to identify the shape and size of the contact area in the static wheel-rail contact. Here, we summarize and compare methods to identify the static wheel-rail contact area, in particular the Hertzian calculation, the use of carbon paper, the use of pressure measurement film, the finite element method, the use of ultrasonic testing, and a semi-Hertzian method called STRIPES. Our review revealed that several methods exist to determine the static wheel-rail contact, which were introduced as well as results of some research projects. However, the partly incomplete description of methods studied impeded a detailed assessment of the results. Furthermore, due to the non-comparable parameters applied in the different studies, it was impossible to contrast the results and methods presented in the different publications. Hence, it is recommended that future results in the field of static wheel-rail contact should be directly contrasted with a detailed finite element model. This proceeding will allow to directly compare different methods on the bases of finite element analysis and thus the identification of a method for each situation.

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On the accuracy of the pressure measurement film in Hertzian contact situations similar to wheel-rail contact applications

Cited by 17 publications

References 8 publications

In situ evaluation of contact stiffness in a slip interface with different roughness conditions using ultrasound reflectometry

In situ evaluation of contact stiffness in a slip interface with different roughness conditions using ultrasound reflectometry

Static model of a snowboard undergoing a carved turn: validation by full-scale test

Overview of methods to identify the static normal wheel-rail contact

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