3 quasi-static tests at 1mm/min displacement rate.

1st test: Acoustic emission threshold 50 dB; Load increased until first acoustic emission hit, then displacement held constant.

2nd test: Acoustic emission threshold 55 dB; Load increased until first acoustic emission hit, then displacement held constant.

3rd test: Acoustic emission threshold 55 dB; Load increased until first cluster of acoustic emission hits, then displacement held constant.