Modeling the effect of probe force on length measurements on polymer parts

Ali Mohammadi, Mads Rostgaard Sonne, Giuseppe Dalla Costa, Daniel González Madruga, Leonardo De Chiffre, Jesper Henri Hattel

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review


Measurement uncertainty at micrometer level is in the future going to be very common in dimensional measurements on polymer parts. Accurate dimensional measurement of polymer parts is becoming a key and common practice in the industry, especially when micrometer tolerances are required. When conducting measurements with a contact probe there is always a force applied to the part. This force (0.3N – 3.3N) leads to deformations that an influence the final result. The unknown deformation of the part under the measurement conditions can produce significant errors in the measurement. In the present work, Hertzian contact theory was applied to find the deformation analytically, where the measuring force was imposed to the part. Material properties of the polymer and radius of the probe tip were known parameters. The finite element software ABAQUS was then used to model the contact problem numerically. Both analytical and numerical approaches were compared with the experimental results. The results showed that the numerical model was able to predict the deformation of the polymer part due to different probe forces. Furthermore it was shown, that the probe force should be taking into account when measurement with a few micrometer accuracy should be performed on thin walled polymer parts.
Original languageEnglish
Title of host publicationProceedings of euspen’s 16th International Conference & Exhibition
Number of pages2
Publication date2016
Publication statusPublished - 2016
Eventeuspen’s 16th International Conference & Exhibition - East Midlands Conference Centre, Nottingham, United Kingdom
Duration: 30 May 20163 Jun 2016


Conferenceeuspen’s 16th International Conference & Exhibition
LocationEast Midlands Conference Centre
CountryUnited Kingdom


  • Metrology
  • Measurement force
  • Modelling.

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