WEBVTT

1
00:00:00.000 --> 00:00:04.000
Thrust is concentrated at the cutter-rock contact.

2
00:00:04.000 --> 00:00:08.000
A crushed zone forms under concentrated contact stress.

3
00:00:08.000 --> 00:00:12.000
Cracks extend away from the contact region.

4
00:00:12.000 --> 00:00:16.000
Schematic only: no force or crack-length prediction.