Search

Composite materials are known to have starkly non-linear dynamic behaviour. As such, when considering the use of composite materials in dynamic environments, it is important to understand the variations in non-linear behaviour that can occur as a result of fatigue damage. This work has gathered data for numerous components which are trialled under High Cycle Fatigue (HCF) conditions with regular stepped sine investigations of resonant response at two or more modes. The resultant non-linear behaviour across the endurance test is compared and features are investigated. Non-linear responses for two differing specimen damage scenarios are investigated; artificial delamination at the mid-plane and delamination occurrence from terminated plies. Correlations between non-linear behaviour at different modes are observed and changes due to the increasing presence of damage are investigated. [ABSTRACT FROM AUTHOR]