Tyres shoulder section characterization by means of ESPI

Vito Pagliarulo; Pasquale Memmolo; Massimo Martorelli; Francesco Timpone; Pietro Ferraro

doi:10.1117/12.2319395

7 September 2018 Tyres shoulder section characterization by means of ESPI

Vito Pagliarulo, Pasquale Memmolo, Massimo Martorelli, Francesco Timpone, Pietro Ferraro

Proceedings Volume 10834, Speckle 2018: VII International Conference on Speckle Metrology; 108341L (2018) https://doi.org/10.1117/12.2319395
Event: SPECKLE 2018: VII International Conference on Speckle Metrology, 2018, Janów Podlaski, Poland

Abstract

In this work is exploited the possibility to use Electronic Speckle Pattern Interferometry (ESPI) for the characterization of different tyres with particular attention to the tyres shoulder section. Tyres characterization is of fundamental importance for vehicle dynamics modelling, since they are the main responsible of vehicles dynamical behaviour and thanks to their ability to deform, they allow to drive a vehicle generating the appropriate interaction forces at the interface with the road. Their behaviour is a consequence to their very complex structure. Two different racing tyres, one for car and other for motorcycle, have been considered. The investigation has been focused at the aim to evaluate and measure the section’s components in order to get accurate information about the different layers along through the tyres shoulder section. Here we demonstrate that the different layers (rubber, nylon, steel) can be easily highlighted and identified by mean of the ESPI that, thanks to its high sensitivity, is capable to estimate the different out of plane displacement of the different layers that respond in a different way (i.e. with a different deformation) to a thermal stimulus highlighting the layers themselves. Moreover, we introduce a de-noising step in the reconstruction process: in particular we enhance the wrapped phase information by using a suitable algorithm called SPADEDH. It is important to note that the assessment about the different layers along the section is a very difficult task to obtain by visual inspection or classical microscopy. In fact, the condition of the cutted surface, or rather the strong inhomogeneity and the roughness make impossible to obtain good images especially in the shoulder area.

Citation Download Citation

Vito Pagliarulo, Pasquale Memmolo, Massimo Martorelli, Francesco Timpone, and Pietro Ferraro "Tyres shoulder section characterization by means of ESPI", Proc. SPIE 10834, Speckle 2018: VII International Conference on Speckle Metrology, 108341L (7 September 2018); https://doi.org/10.1117/12.2319395

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