ROVER WHEELS: Monitoring changes over time, NOTE: Read back through the thread to avoid repeating misconceptions |
ROVER WHEELS: Monitoring changes over time, NOTE: Read back through the thread to avoid repeating misconceptions |
May 16 2013, 08:35 AM
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#201
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Junior Member Group: Members Posts: 22 Joined: 10-August 12 From: Australia Member No.: 6530 |
[MOD NOTE: This thread follows on a post by Ed Truthan containing a MAHLI mosaic of MSL wheels taken on sol 275.]
Ed: zooming in on that marvellous underbelly MAHLI montage, there appears to be further (and previously noted) deformation of the wheel surfaces. Damage is most evident in the view of the front-left wheel inner surface. Such wear has previously been discussed and concerns allayed. Nevertheless, the front left wheel surface *appears* to have been punctured. We've only done 700 meters, and have 7000 more to get to Mt Sharp..... Given that more odometry has now accumulated, is any (re-)new(ed) concern valid? DeanM |
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Sep 2 2014, 12:38 AM
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#202
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Senior Member Group: Members Posts: 1044 Joined: 17-February 09 Member No.: 4605 |
Most of the trials and data for aerospace alloys and tempers has been directed towards aircraft applications where fatigue crack growth rates get a lot of attention. But with Curiosity's wheels we are well outside normal designs and comfort zones and for the thin skin between cleats deterioration will be a function of accumulating penetrative injuries rather than crack growth. The cleats themselves seem to be hanging in there but as I think Paolo mentioned will be subject to repetitive flexing although the frequency of such is anyone's guess. Mars has thrown up an unexpected, damaging terrain that could not possibly have been anticipated from orbital imaging, but overall the mobility system has met all performance expectations. But in the temperature range at Gale there would be no wheel durability advantage in night driving.
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