Thirty-eight peer-review papers provide the latest information on fatigue testing and analysis under variable amplitude spectrum loading conditions focus purely on fatigue testing, fatigue design techniques, or a combination of both. This new ASTM publication serves as an important reference for engineers and scientists involved in structural integrity and component lifetime management. Six sections cover: • Fatigue Testing and Laboratory • Aerospace Applications, including full-scale aircraft testing • Design Approaches and Modelling • Other Applications • Load Interaction • Probabilistic and Multiaxial Effects