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INVESTIGATING THE EFFECTS OF DIFFERENT CRACK SHARPENING METHODS ON THE MODE I AND MODE II FRACTURE TESTS OF AN EPOXY RESIN

Book Contribution - Book Chapter Conference Contribution

In fracture tests, the sharpness of the pre-crack is highly important and can affect the test results considerably. Although lots of studies have been done regarding the investigation of the effects of different crack sharpening methods on the results of mode I fracture tests, to the best of the authors’ knowledge, not many experimental studies are available for the case of polymer materials under mode II loading. Accordingly, in this study, an initial assessment of the effects of two different ways of sharpening the pre-crack is done under mode I and mode II fracture tests. The specimens are made from an epoxy resin commercially known as SikaPower®-830 that is used in the fabrication of adhesive joints in wind turbine composite blades. Considering the first way of sharpening, two types of blades with different thicknesses were used to sharpen the pre-crack by sawing motions (as mentioned in the ASTM D5045). As for the second way, a guillotine-like fixture (drop tower for dynamic pre-cracking) presented in another study was utilized. Based on the results, the different crack sharpening methods applied in this study have no considerable effects on the results of the mode I and mode II fracture tests. However, for mode II loading, changes of the apparent critical stress intensity factor (ACSIF) caused by altering the crack sharpening method are more pronounced.
Keywords: fracture tests; mode II; crack sharpening; wind turbine
Book: 20th European Conference on Composite Materials
Pages: 1-8
Number of pages: 8
Publication year:2022
Keywords:fracture tests, mode II, crack sharpening, wind turbine blades
  • ORCID: /0000-0002-8341-1205/work/117750451
  • ORCID: /0000-0002-5228-9307/work/117748246
  • ORCID: /0000-0002-4099-3866/work/117750007