52nd AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference 2011
DOI: 10.2514/6.2011-1758
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Characterization of Manufacturing Defects Common to Composite Wind Turbine Blades: Flaw Characterization

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Cited by 23 publications
(20 citation statements)
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“…As such, matrix cracking damage was estimated by: (5) where σ 22 and S 22 are transverse stress and transverse strength, respectively and τ 12 and S 12 are shear stress and strength, respectively. It must be noted that this same equation is utilized for both tensile and compressive cases and the associated material properties are changed for each case (Table 1).…”
Section: Table 3 Progressive Damage Outline and Degradation Approachmentioning
confidence: 99%
See 1 more Smart Citation
“…As such, matrix cracking damage was estimated by: (5) where σ 22 and S 22 are transverse stress and transverse strength, respectively and τ 12 and S 12 are shear stress and strength, respectively. It must be noted that this same equation is utilized for both tensile and compressive cases and the associated material properties are changed for each case (Table 1).…”
Section: Table 3 Progressive Damage Outline and Degradation Approachmentioning
confidence: 99%
“…Thus, research specific to understand the criticality of defects common to blades is necessary and coupon level, benchmark testing was performed by the MSUCG. [4][5][6][7][8][9] The prior benchmark material testing (BMT) was performed to establish and understand the material properties, failure points and modes, and damage progression of both unflawed and flawed specimens. For example, it was clearly evident that once a flaw was introduced, the material response in the flawed area dominated the overall response in most cases as indicated by the review of digital image correlation data as seen in Figure 2.…”
Section: Introductionmentioning
confidence: 99%
“…6 These results were then utilized to build simple analytical models with the purpose of performing laminate analysis with included defects in a coordinated effort with the Flaw Characterization task. 5,7 An understanding of the changes in the material properties associated with characterized flaws was achieved on a coupon level with physical testing being performed with several configurations of each of the different flaw types. This testing clearly indicated that fiber misalignment and porosity resulted in degraded material properties and decreased material performance.…”
Section: Introductionmentioning
confidence: 99%
“…As such, the MSUCG has divided this effort into two distinct tasks: Part A-Flaw Characterization, and Part B-Effects of Defects. [5][6][7][8] The function of the Flaw Characterization effort has been to provide quantitative analysis for two major directives: (1) acquisition and generation of quantitative flaw data for use in the Effects of Defects numerical modeling program; and, (2) development of a flaw severity designation system and probabilistic risk management protocol for as-built flawed structures. The Effects of Defects portion is focused on the development of modeling capabilities to predict the damage progression and structural implications of common flaws found in composite wind turbine blades.…”
Section: Introductionmentioning
confidence: 99%
“…The thickness of the spar cap varies along the blade length; generally, the thickest zone (over almost 50 layers) is always from the maximum chord to 1/2 of the blade length, which is also the most important load-carrying zone of a spar cap. In this thick layer zone, it is easy to produce in-plane wrinkles and out-plane wrinkles during the blade manufacturing, which significantly reduces the local strength of the spar cap [13,14]. Under the alternating action of the ultimate load and fatigue load, the coupling response of delamination and buckling may easily occur in this zone [15][16][17][18][19][20].…”
mentioning
confidence: 99%