Simulation of Mechanical Behavior and Damage of a Large Composite Wind Turbine Blade under Critical Loads

Tarfaoui, Mostapha; Nachtane, Mourad; Khadimallah, H.; Saifaoui, D.

doi:10.1007/s10443-017-9612-x

Cited by 41 publications

(32 citation statements)

References 14 publications

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“…Therefore, Equations (48) and (53) combine to supply ξ c /k as a function of ϕ a . Then, the solution of Equation (46), satisfying the boundary condition of Equation (47), can be solved numerically.…”

Section: Elastic/plastic Strain Solutionmentioning

confidence: 99%

“…By definition, ξ θ = ∂ε θ /∂ϕ a if ξ θ and ε θ are regarded as functions of ϕ a and ρ. However, the solution of Equation (46) provides ξ θ as a function of ϕ a and ϕ. In this case, ∂ε θ ∂ϕ a + ∂ε θ ∂ϕ ∂ϕ ∂ϕ a = ξ θ .…”

Section: Elastic/plastic Strain Solutionmentioning

confidence: 99%

“…It is evident from Equation (57) that ϕ = ϕ a is a characteristic curve, and that D = 0 on this curve. Having ξ θ /k as a function of ϕ a at ϕ = ϕ a (or ρ = a) from the solution of Equation (46), it is possible to integrate Equation (56) along the characteristic curve ϕ = ϕ a with the use of the boundary condition in Equation (58), to find the circumferential strain at the inner radius of the cylinder without solving Equation (54) for the entire plastic region. In order to illustrate the procedure for finding the strain solution in the entire plastic region, consider a schematic field of characteristics shown in Figure 3, where ϕ m is the value of ϕ a at the end of loading.…”

Section: Elastic/plastic Strain Solutionmentioning

confidence: 99%

“…Plastic yielding is controlled by the Tsai-Hill yield criterion. This criterion is often used in applications [45][46][47][48][49]. Therefore, the material is initially anisotropic.…”

Section: Introductionmentioning

confidence: 99%

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A Theory of Autofrettage for Open-Ended, Polar Orthotropic Cylinders

2019

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Autofrettage is a widely used process to enhance the fatigue life of holes. In the theoretical investigation presented in this article, a semi-analytic solution is derived for a polar, orthotropic, open-ended cylinder subjected to internal pressure, followed by unloading. Numerical techniques are only necessary to solve a linear differential equation and evaluate ordinary integrals. The generalized Hooke’s law connects the elastic portion of strain and stress. The flow theory of plasticity is employed. Plastic yielding is controlled by the Tsai–Hill yield criterion and its associated flow rule. It is shown that using the strain rate compatibility equation facilitates the solution. The general solution takes into account that elastic and plastic properties can be anisotropic. An illustrative example demonstrates the effect of plastic anisotropy on the distribution of stresses and strains, including residual stresses and strain, for elastically isotropic materials.

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Section: Elastic/plastic Strain Solutionmentioning

confidence: 99%

Section: Elastic/plastic Strain Solutionmentioning

confidence: 99%

Section: Elastic/plastic Strain Solutionmentioning

confidence: 99%

“…Plastic yielding is controlled by the Tsai-Hill yield criterion. This criterion is often used in applications [45][46][47][48][49]. Therefore, the material is initially anisotropic.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Theory of Autofrettage for Open-Ended, Polar Orthotropic Cylinders

2019

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“…The results show that BPNN can be effectively used to predict the strain of unmeasured points of wind turbine blades.Energies 2019, 12, 1026 2 of 15 strain, stiffness, and deflection, and then provided more accurate stiffness data for a numerical model of load calculations for wind turbines. Thus, many achievements have been obtained in the blade load bearing capacity and parameter measurement methods, and some studies have also focused on structural characteristics and damage analysis of the blades [5][6][7][8][9][10][11][12]. Besides, some surrogate models for wind turbine blade stress/strain prediction due to the significant computational burden of physics-based simulation were constructed [13,14].…”

mentioning

confidence: 99%

GA-BP Neural Network-Based Strain Prediction in Full-Scale Static Testing of Wind Turbine Blades

Liu

Wang³

et al. 2019

Energies

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This paper proposes a strain prediction method for wind turbine blades using genetic algorithm back propagation neural networks (GA-BPNNs) with applied loads, loading positions, and displacement as inputs, and the study can be used to provide more data for the wind turbine blades’ health assessment and life prediction. Among all parameters to be tested in full-scale static testing of wind turbine blades, strain is very important. The correlation between the blade strain and the applied loads, loading position, displacement, etc., is non-linear, and the number of input variables is too much, thus the calculation and prediction of the blade strain are very complex and difficult. Moreover, the number of measuring points on the blade is limited, so the full-scale blade static test cannot usually provide enough data and information for the improvement of the blade design. As a result of these concerns, this paper studies strain prediction methods for full-scale blade static testing by introducing GA-BPNN. The accuracy and usability of the GA-BPNN prediction model was verified by the comparison with BPNN model and the FEA results. The results show that BPNN can be effectively used to predict the strain of unmeasured points of wind turbine blades.

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Numerical investigation of ice accretion on an offshore composite wind turbine under critical loads

Lagdani¹,

Tarfaoui

Nachtane

et al. 2020

Int J Energy Res

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Summary In northern regions, wind turbines are affected by the formation of ice on the surface of their structures, which usually occurs on moving blades, resulting in a significant decrease in aerodynamic performance and then the output power tends to reduce. This research evaluates the mechanical behavior and damage of the proposed composite blade structure under icing conditions. A comparative evaluation was carried out considering three ice configurations and three blade positions. The results are then examined and analysed. During this study, the blade in service was subjected to three different critical loads. A numerical simulation is adopted using finite element method (FEM) with ABAQUS software to localize damage in the composite wind turbine blade. The method developed is based on the failure criteria of HASHIN to detect failure modes in large structures and to identify the most sensitive zones. Major damage appeared in the transition region and was the principal reason for the composite blade failure. Furthermore, greater strength and stiffness were found with Carbon (CC) fibers blade designs, whereas configuration 3 was found to be the best one, and the optimal blade position was when the ice structure was placed vertically.

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Simulation of Mechanical Behavior and Damage of a Large Composite Wind Turbine Blade under Critical Loads

Cited by 41 publications

References 14 publications

A Theory of Autofrettage for Open-Ended, Polar Orthotropic Cylinders

A Theory of Autofrettage for Open-Ended, Polar Orthotropic Cylinders

GA-BP Neural Network-Based Strain Prediction in Full-Scale Static Testing of Wind Turbine Blades

Numerical investigation of ice accretion on an offshore composite wind turbine under critical loads

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