Process induced transverse shear stresses in thick unidirectional pultruded profiles

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Abstract

The residual stresses in the transverse to the fiber direction might be critical for unidirectional composites since their transverse shear strength is relatively low. Transverse shear behavior therefore needs to be analyzed carefully for thick pultruded profiles which have been increasingly used in structural load bearing applications. This is a necessary task to avoid potential crack formation during the process and to minimize the process induced damage level. In the present work the process induced residual stresses are predicted for a 100 100 mm unidirectional pultruded square profile made of glass/polyester. A thermochemical model is coupled with a mechanical model using the finite element method. The temperature and degree of cure distributions are calculated for three di erent preheating temperature defined at the pultrusion die inlet, namely Tinlet = 20 C, 40 C and 60 C. Mechanical constraints are formed due to the through thickness cure gradients and elastic modulus variation. The nonuniform internal constraints yield in an internal shear deformation. The transverse shear stresses are found to be more critical than the transverse normal stresses in tension.
Original languageEnglish
Title of host publicationECCM17, 17th European Conference on Composite Materials
EditorsK. Drechsler
Place of PublicationMunich, Germany
PublisherESCM European Society for Composite Materials
Number of pages8
ISBN (Print)978-3-00-053387-7
Publication statusPublished - 26 Jun 2016
Event17th European conference on Composite Materials, ECCM 2016 - Munich, Germany
Duration: 26 Jun 201630 Jun 2016
Conference number: 17

Conference

Conference17th European conference on Composite Materials, ECCM 2016
Abbreviated titleECCM
CountryGermany
CityMunich
Period26/06/1630/06/16

Keywords

  • METIS-319122
  • IR-102309

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