What type of study is this?

This is a Observational study (also classified as: Finite Element Analysis).

Cause Analysis of Wind Turbine (#7 and #8) Blade Root Bolts Fracture in a Wind Farm

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Investigation reveals bolt fracture causes in wind turbines, suggesting optimization strategies for maintenance.

Bolt fracture risk reduced by 50% through proposed optimization strategies, enhancing wind turbine safety.
Numerical simulations indicated fatigue strength decreases due to insufficient preloading, impacting bolt performance.
On-site inspections uncovered cracks originating in stress concentration areas, reinforcing the need for better designs.
Improved tensioning processes and technology can raise allowable stress from 854.5 MPa to 940 MPa, enhancing durability.

Niu et al. (2025) studied this question.

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