A thorough presentation of testing performed, findings and conclusions regarding LCPs by Van's engineering. The key finding is that “manufactured cracks” (those formed while dimpling some LCPs) are in a compressive stress field after riveting. This was proven by a pretty exhaustive series of fatigue tests with the manufactured cracks at various orientations relative to the cyclic stress field during testing, and various orientations relative to the material grain. This is huge news because it showed that manufactured cracks don't propagate under cyclic loading. The presentation also made clear that their conclusions and recommendations are very conservative (they based the testing on the single highest rivet load even though all other rivets' loads are much lower, they assume 50% aerobatic and 50% flight school loading profiles, apply a factor of 1/3 on predicted life). Although some parts are recommended for replacement in an “abundance of caution”, even those parts really don't need to be replaced.
https://youtu.be/O-W4WH57qW0?si=lMHAQFqcSxNReOgSSome giants in the industry weigh in on the engineering summary.
https://youtu.be/26-2g-rgkLo?si=y36T7jN8Vc1ZImNe