Composite Wind Turbine Blade Effects of Defects: Part B- Progressive Damage Modeling of Fiberglass/Epoxy Laminates with Manufacturing Induced Flaws

Nelson, Jared; Cairns, Douglas S.; Riddle, Trey; Workman, Julie

doi:10.2514/6.2012-1421

Cited by 7 publications

(15 citation statements)

References 3 publications

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“…6,8 As the authors have noted, these models do not capture the damage progression and as such do not capture more subtle damage results such as softening ( Figure 3). Further, degrading properties to near-zero was found to be an overestimation resulting in underestimation of load redistribution and residual strength.…”

Section: A Continuum Damage Modeling (Cdm)mentioning

confidence: 94%

“…[23][24] A two-dimensional model of an IP Wave was established utilizing material properties from this specific material system with layers of cohesive elements between the tows. 8 While significant efforts were made attempting to implement a pure DDM in a similar case to the CDM noted above, correlations were not achieved. The model resulted in a damage progression that matched what was observed during physical testing, but the resulting load-displacement curves showed poor correlation.…”

Section: Figure 4: Representation Of a Cohesive Element's Bi-linear Tmentioning

confidence: 95%

“…As such, the decision tree shown in Figure 2 shows the typical logic utilized in a progressive damage model and was utilized in previous CDM efforts performed by the authors which was the foundation for the work presented herein. 6,8 Many generalized CDM's have been established for composite materials. [11][12][13][14] Further some have utilized finite element analysis to account for damage in the fiber and matrix, independently.…”

Section: A Continuum Damage Modeling (Cdm)mentioning

confidence: 99%

“…As reported at the 2012 AIAA-SDM conference, these models were built with the material properties and initial convergence was achieved with the damage progression. 8 While the entire project has focused on three composite material defect types, only in-plane (IP) waves are analyzed and discussed herein ( Figure 1). Four layer coupons with IP waves were tested in tension and compression and the results generally indicated that as critical flaw parameter(s) increased material properties and overall strength decreased.…”

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%

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Effects of Defects: Part B—Progressive Damage Modeling of Fiberglass/Epoxy Composite Structures with Manufacturing Induced Flaws Utilizing Cohesive Zone Elements

Woo

Nelson

Cairns

et al. 2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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The Effects of Defects is important for the reliability of modern composite wind turbine blades. The DOE has sponsored a comprehensive study to characterize common manufacturing defects and establish damage growth and validation tools to contribute to a wind turbine blade reliability infrastructure. To support this development of a reliability infrastructure, progressive damage modeling of blade representative coupons has been performed. A model has been developed that is combined of both continuum and discrete modeling approaches. A user-defined material subroutine has been created and used with material properties established from experimental testing for the former, while cohesive zone elements were placed between each fiber tow to capture the fracture that occurs in these areas for the latter. Two-dimensional (2D), four-layer coupon level models were generated based on the geometry of the as-tested specimens. Results from this model were compared to the visual damage progression and stress-strain data from in-plane wave tests in tension and compression. While the uniformity of the models resulted in more dramatic changes at failure points, the progression was found to match in these cases, thereby verifying the combined continuum and discrete modeling approach. NomenclatureBRC = Blade Reliability Collaborative MSUCG = Montana State University Composites Group OP = out-of-plane wave IP = in-plane wave CDM = Continuum Damage Model DDM = Discrete Damage Model σ = Stress ε = Strain u = displacement

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Section: A Continuum Damage Modeling (Cdm)mentioning

confidence: 94%

Section: Figure 4: Representation Of a Cohesive Element's Bi-linear Tmentioning

confidence: 95%

Section: A Continuum Damage Modeling (Cdm)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Defects: Part B—Progressive Damage Modeling of Fiberglass/Epoxy Composite Structures with Manufacturing Induced Flaws Utilizing Cohesive Zone Elements

Woo

Nelson

Cairns

et al. 2013

54th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

Self Cite

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Modelling Creep in Concrete Under a Variable External Load

Hakim

2019

Integral Methods in Science and Engineering

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Damage mitigation techniques in wind turbine blades: A review

et al. 2017

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Wind blades are major structural elements of wind turbines, but they are prone to damage like any other composite component. Blade damage can cause sudden structural failure and the associated costs to repair them are high. Therefore, it is important to identify the causation of damage to prevent defects during the manufacturing phase, transportation, and in operation. Generally, damage in wind blades can arise due to manufacturing defects, precipitation and debris, water ingress, variable loading due to wind, operational errors, lightning strikes, and fire. Early detection and mitigation techniques are required to avoid or reduce damage in costly wind turbine blades. This article provides an extensive review of viable solutions and approaches for damage mitigation in wind turbine blades.

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Composite Wind Turbine Blade Effects of Defects: Part B- Progressive Damage Modeling of Fiberglass/Epoxy Laminates with Manufacturing Induced Flaws

Cited by 7 publications

References 3 publications

Effects of Defects: Part B—Progressive Damage Modeling of Fiberglass/Epoxy Composite Structures with Manufacturing Induced Flaws Utilizing Cohesive Zone Elements

Effects of Defects: Part B—Progressive Damage Modeling of Fiberglass/Epoxy Composite Structures with Manufacturing Induced Flaws Utilizing Cohesive Zone Elements

Modelling Creep in Concrete Under a Variable External Load

Damage mitigation techniques in wind turbine blades: A review

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