�?�?t ε l ρ l v l + �?�?ε l ρ l v l v l = ε l �?�?τ l + ε l ρ l g �?ε l �?p �?β v l �?v s Evaluating some time required for parallel fractures and wedge fractures to reach stable loss, it can be discovered that there is a diameter expansion at the doorway on the wedge fracture relative for the exit. The existenc