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Evaluation of uncertainty on Shore hardness measurements of tyre treads and implications to tyre/road noise measurements with the Close Proximity method

Vieira, Tiago ; Lundberg, Joacim LU orcid and Eriksson, Olle (2020) In Measurement: Journal of the International Measurement Confederation 162.
Abstract

Shore hardness measurements subject rubber bodies to standardized indentations. While easily performed, the measurements are subject to uncertainties. Although typical variances for Shore hardness are found in standards, operator and instrument effects are not well described, requiring statistically designed experiments to estimate effects and variance components. This paper focuses on uncertainty in Shore A hardness measurements of tyre tread elements and quantifies operator and instrument effects. Evaluation of uncertainty of Shore A measurements were performed on tyres under controlled conditions using three instruments, two tyres and five operators. Results show that the operator variance component and instrument effects are larger... (More)

Shore hardness measurements subject rubber bodies to standardized indentations. While easily performed, the measurements are subject to uncertainties. Although typical variances for Shore hardness are found in standards, operator and instrument effects are not well described, requiring statistically designed experiments to estimate effects and variance components. This paper focuses on uncertainty in Shore A hardness measurements of tyre tread elements and quantifies operator and instrument effects. Evaluation of uncertainty of Shore A measurements were performed on tyres under controlled conditions using three instruments, two tyres and five operators. Results show that the operator variance component and instrument effects are larger than the reference variance contribution in ISO 11819-3:2017. The interaction between operator and instrument is estimated to be the largest source of variation, while operator and instrument main effects are of similar size as the error component. Recommendations to reduce uncertainties include ignoring instantaneous values and requiring an instrument stand.

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Please use this url to cite or link to this publication:
author
; and
publishing date
type
Contribution to journal
publication status
published
subject
keywords
CPX hardness correction, Hardness, Shore A, Tyre, Uncertainty, Variation, Däck, Shore, Hårdhet, CPX
in
Measurement: Journal of the International Measurement Confederation
volume
162
article number
107882
publisher
Elsevier
external identifiers
  • scopus:85084605841
ISSN
0263-2241
DOI
10.1016/j.measurement.2020.107882
language
English
LU publication?
no
additional info
Publisher Copyright: © 2020 The Author(s)
id
603190d7-471f-41a4-8729-df870a6fdbbc
date added to LUP
2025-03-14 14:13:12
date last changed
2025-04-04 14:16:43
@article{603190d7-471f-41a4-8729-df870a6fdbbc,
  abstract     = {{<p>Shore hardness measurements subject rubber bodies to standardized indentations. While easily performed, the measurements are subject to uncertainties. Although typical variances for Shore hardness are found in standards, operator and instrument effects are not well described, requiring statistically designed experiments to estimate effects and variance components. This paper focuses on uncertainty in Shore A hardness measurements of tyre tread elements and quantifies operator and instrument effects. Evaluation of uncertainty of Shore A measurements were performed on tyres under controlled conditions using three instruments, two tyres and five operators. Results show that the operator variance component and instrument effects are larger than the reference variance contribution in ISO 11819-3:2017. The interaction between operator and instrument is estimated to be the largest source of variation, while operator and instrument main effects are of similar size as the error component. Recommendations to reduce uncertainties include ignoring instantaneous values and requiring an instrument stand.</p>}},
  author       = {{Vieira, Tiago and Lundberg, Joacim and Eriksson, Olle}},
  issn         = {{0263-2241}},
  keywords     = {{CPX hardness correction; Hardness; Shore A; Tyre; Uncertainty; Variation; Däck; Shore; Hårdhet; CPX}},
  language     = {{eng}},
  month        = {{10}},
  publisher    = {{Elsevier}},
  series       = {{Measurement: Journal of the International Measurement Confederation}},
  title        = {{Evaluation of uncertainty on Shore hardness measurements of tyre treads and implications to tyre/road noise measurements with the Close Proximity method}},
  url          = {{http://dx.doi.org/10.1016/j.measurement.2020.107882}},
  doi          = {{10.1016/j.measurement.2020.107882}},
  volume       = {{162}},
  year         = {{2020}},
}