Validation of static residual strength analyses of fiber composite bonded joints

Kurzfassung

This work investigates the validation of static residual strength analyses of fiber-reinforced composite bonded joints. It highlights that safety-critical applications, such as adhesive bonds in aircraft structures, are subject to stringent regulations and must tolerate damage. While numerical simulations for predicting the static strength of undamaged adhesive bonds exist, there is a lack of methods to validate models with pre-existing damage from impacts or fatigue. The paper aims to identify suitable validation methods by applying advanced modeling strategies and material models to more complex specimens with artificial disbonds and interlaminar damage. The specimens are fabricated by introducing release films to simulate reproducible damage. The study compares the results of numerical simulations and experimental tests to assess whether existing simulation strategies can be applied to specimens with pre-existing damage without further adjustments. More robust validation techniques are proposed to ensure the reliability of damage tolerance analyses in adhesive joints, particularly in aviation applications.