Each leg of Ingenuity has what I'll call a knee. After just a few flights, on 2021 May 10, NASA wrote:
By plastically deforming and fatiguing as it absorbs energy, this flexure acts much like the crumple zone structure of a car chassis. However, unlike a car or the crumple-cushioned landing gear of the Apollo moon landers, Ingenuity’s titanium springs rebound after each impact to pull these aluminum dampers back into shape for the next landing. The aluminum damper gets a little bit weaker with each cycle as cracks and creases develop. While it would eventually break after a few hundred hard landings, with only a few flights scheduled for this demonstration, that’s a problem we could only dream of having.
Almost a year later, it's had 23 flights. Have any of its sensors, such as its IMU or altimeter, yet been able to detect how quickly this expected gradual cracking is developing? Has some threshold been chosen, beyond which Ingenuity should stick to only gentle landings?
BrendanLuke15's comment's linked paper says the damper is "1100-series annealed aluminum" whose damping is "largely independent of temperature or atmospheric pressure." But how does one apply fatigue datasheets for 1100 to this particular shape (1 x 2 cm? 0.5 mm thick? deflecting how much and how fast)? How differently would a partially fatigued damper behave (as if it were half as thick because of cracks)? Could that behavior be measured by Ingenuity?