SwRI supports the Aircraft Structural Integrity Program (ASIP) efforts for military aircraft from providing in-flight recording of aircraft loads to damage tolerance analysis of critical fatigue locations using those loads to development of inspection and repair options. We provide a complete range of testing, including detailed metallurgy and fractography, material property tests, and full scale aircraft fatigue tests. We offer a full array of ASIP engineering services and non-destructive inspection (NDI) support for all types of aircraft structures.
Come listen to our speakers in Sessions 5 and 11.
Wednesday, November 28
11:00 a.m.-11:30 a.m. Session 5: Characterization, Modeling and Testing II
“Effect of Negative Stress Ratio Testing and Characterization on Damage Tolerance Life Predictions,” William Campbell
Damage tolerance is the predominant USAF management approach for sustainment of aircraft structures. The Generalized Willenborg retardation model, most commonly used for T-38 analyses, accounts for the effect of overloads on subsequent loading cycles by modifying the effective stress ratio of subsequent cycles. This presentation will highlight the challenges associated with and the steps taken to improve the overall understanding of how the Generalized Willenborg model works with the T-38 usage spectrum within the fatigue crack growth analysis tool AFGROW and the material models used in fatigue life predictions. Conclusions and recommendations for future work will be emphasized.
Thursday, November 29
3:30 p.m.-4:00 p.m. Session 11: Loads and Environment Characterization
“Modernizing the A-10 Loading Spectrum Development Process,” Luciano Smith
As the A-10 fleet transitioned away from the legacy recorders that were becoming increasingly obsolete and toward a new recording solution, SwRI developed new software tools to process the new data, significantly increasing flexibility and capability over the legacy programs in understanding the details of how the A-10 fleet was being flown, and allowing for many valuable studies regarding issues such as relative severity across the fleet, gunfire rates, stores carried, etc., and what that all meant for the structural integrity of the fleet. SwRI then worked to automate the data processing and maneuver spectrum development functions and transition them to the Tinker AFB ASIMIS office, giving the USAF even more flexibility and internal capability to gather usage data necessary for force management. This presentation gives the history of this transition from legacy recorders and tools to modernized processes and organic capabilities, and the program benefits that have resulted from that transition.
SwRI will be exhibiting at the ASIP Conference, Booth No. 18.
For more information, please contact Luciano Smith.