Study On Failure Simulation Of Composite Wind Turbine Blades

With the development of large-scale and offshore wind turbines,as the number continues to increase,the number of accidents of wind turbine blades occurs frequently,which makes the research on the damage and failure of wind turbine blades particularly important.The use of experimental research institutes to design the damage and failure of wind turbine blades will not only increase the cost,but also delay the engineering time.Finding a suitable simulation method for numerical simulation of wind turbine blades can solve this problem well.At present,most scholars focus on the influence of a single failure mode on blades,without considering the coupling effect of various failure modes.In this paper,three main failure modes of composite blade are studied from the perspective of mechanical simulation,namely,the failure of composite laminates,the failure of interface viscous separation and the failure of colloidal cracking.In order to study the interaction between these failure modes,a coupled failure analysis was performed for the three failure modes.On this basis,a method to simulate multiple failure modes of composite wind turbine blades is proposed.This paper carries out research work from the following four aspects:(1)Propose corresponding calculation methods for the three failure modes,and use ABAQUS for simulation verification.The damage failure of laminates,the failure of interface viscous separation,and the failure of colloidal cracking were respectively simulated by Hashin failure model,cohesive zone model(CZM)/virtual crack closure technology(VCCT),and extended finite element method(XFEM).And briefly explain the theory and calculation process of these methods,with the help of ABAQUS to simulate existing experimental results or analytical solutions,and compare the results to illustrate the applicability and accuracy of the methods used.(2)Explore the fatigue failure of interface viscous separation failure and colloidal cracking failure.The simulation method is based on Paris' s law and uses the crack growth rate to simulate the two failure modes respectively.The numerical method for simulating the viscous separation of the interface is VCCT,and the colloid cracking is XFEM.The feasibility of the method used is verified by comparing the results of numerical simulation with the results of existing experiments.(3)Study the feasibility of numerical simulation of multiple failure modes and the interaction between each failure mode.First,simulate the failure mode of interface viscous separation-colloid cracking,and the failure mode of laminate damage-interface viscous separation,and then conduct the coupling analysis of the three failure modes on this basis.Through the corresponding numerical simulation,the feasibility of the numerical method is explained,and the mutual influence of the three types of failure modes is discussed.It is concluded that the coupling analysis of multiple failure modes is necessary when analyzing the failure of composite wind turbine blades.(4)Multi-failure mode analysis of composite wind turbine blade segments.This part proposes a method to analyze the failure of wind turbine blades,that is,first conduct a fluid-solid coupling analysis of the full-size wind turbine blades,and calculate the deformation and stress of the blades under working load.Then observe the deformation and stress results,and select the more dangerous leaf segments.Finally,the multi-failure mode analysis of this wind turbine blade segment is carried out.The feasibility and reference value of the method are illustrated by simulating the damage of blade segments under multiple failure modes.