From measurements errors to a new strain gauge design for composite materials

Lars Pilgaard Mikkelsen, Marco Salviato, Jacopo Gili

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Abstract

Significant over-prediction of the material stiffness in the order of 1-10% for polymer based composites has been experimentally observed and numerical determined when using strain gauges for strain measurements instead of non-contact methods such as digital image correlation or less stiff methods such as clip-on extensometers. In the present work, this has been quantified through a numerical study for three different strain gauges. In addition, a significant effect of a thin polymer coating or biaxial layer in the erroneous using strain gauges has been observed. An erroneous which can be significantly decreased using an enhanced grid design of the measuring grid.
Original languageEnglish
Title of host publicationProceedings of the 20th International Conference on Composite Materials
Number of pages5
PublisherICCM20 Secretariat
Publication date2015
Publication statusPublished - 2015
Event20th International Conference on Composite Materials (ICCM20) - Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015
Conference number: 20

Conference

Conference20th International Conference on Composite Materials (ICCM20)
Number20
CountryDenmark
CityCopenhagen
Period19/07/201524/07/2015

Keywords

  • Strain gauge
  • Strain measurements
  • Composites testing
  • Young modulus

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