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In this investigation, a T-shaped aluminum alloy isogrid stiffener element used in aerospace applications was tested with ultrasonic phased array techniques. The isogrid stiffener element had various crack configurations emanating from bolt holes. Computational simulation methods were used to mimic the experiments in order to help understand experimental results. The results of this study indicate that it is at least partly feasible to interrogate this type of geometry with the given discontinuity configurations using phased array ultrasonics. The simulation methods were critical in helping explain the experimental results and, with some limitation, can be used to predict testing results. [ABSTRACT FROM AUTHOR]

Comprehensive and accurate tests of welded components have become increasingly important as NASA develops new hardware, such as Ares rocket segments, for future exploration missions. Simulation and modeling will play an increased role in the future of nondestructive testing in order to better understand the physics of the testing process and help explain the experimental results. It will also help to prove or disprove the feasibility of a test technique or scenario, help optimize testing, and allow, to a first approximation, determination of limits of detectability. This study presents simulation and experimental results for ultrasonic phased array testing of a critical welded structure important for NASA future exploration vehicles. [ABSTRACT FROM AUTHOR]