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Personal notes and journal for other honeycomb research and happenings is here.
Honeycomb sandwich panel coupons were tested in tension. For details, see the Google Doc linked above. The team will also test the coupons in a vacuum chamber. The team used unperforated honeycomb in this first set of coupons just to build familiarity with working with honeycomb. However, if the team wishes to use unperforated honeycomb on high altitude flights, the team must make sure that the pressure difference between the inside of the honeycomb cells (sea level) and at apogee will not damage the honeycomb or cause failure of the sandwich panel.