The influence of humidity on accuracy length measurement on polymer parts

Daniel González Madruga, A. Alexiou, Giuseppe Dalla Costa, Leonardo De Chiffre, L. C. Neves

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

    Abstract

    The work deals with an experimental study of the influence of humidity on accurate length measurements on ABS parts. Polymer parts absorb water from the ambient until they reach hygroscopic equilibrium. Water content causes an expansion of the polymer part. The relationship between the water content and this expansion has been barely studied, especially from a metrology point of view including its contribution to the measurement uncertainty. The experimental set-up includes a humidity chamber, an invar fixture with 8 inductive probes and a scale. The humidity chamber was used to create the experiment ambient conditions. The invar fixture with the inductive probes, with a resolution of 0.1 μm, allows length measurement on 8 ABS parts at the same time. The scale was used to collect the water content variation during the experiment with a resolution of 0.1 mg. The length and weight of the ABS parts were measured at 5 levels of relative humidity from 50 %RH to 90 %RH, and constant temperature, 20 ±0.2˚C. Water content equilibrium with the ambient was achieved at each level by acclimatization of the parts for 24 hours. An average length variation over the humidity range of 15 μm was found. A condition specific coefficient of moisture expansion of 69±4 μm/(Δ of weight in mg) was estimated.
    Original languageEnglish
    Title of host publicationProceedings of euspen’s 16th International Conference & Exhibition
    Number of pages2
    Publication date2016
    Publication statusPublished - 2016
    Event16th euspen International Conference & Exhibition - East Midlands Conference Centre, Nottingham, United Kingdom
    Duration: 30 May 20163 Jun 2016
    Conference number: 16
    http://www.euspen.eu/events/16th-international-conference-exhibition/

    Conference

    Conference16th euspen International Conference & Exhibition
    Number16
    LocationEast Midlands Conference Centre
    Country/TerritoryUnited Kingdom
    CityNottingham
    Period30/05/201603/06/2016
    Internet address

    Keywords

    • Humidity
    • Dimensional Measurements
    • Measurement Uncertainty
    • Polymers
    • Production Environment

    Fingerprint

    Dive into the research topics of 'The influence of humidity on accuracy length measurement on polymer parts'. Together they form a unique fingerprint.

    Cite this