No matter which of the above head, with contact intrusions by the elastic inelastic stage, with the increasing of invasive load will be intrusive brittle body to produce three kinds of state intrusion marks the elastic-plastic crack.

No matter which of the head, when it is penetrated by contact with the flexibility to enter non-elastic stage, along with increasing load intrusion, we will have in is being penetrated simply have 3 marked a plastic intrusion status pop-up the basic cracks.

Regardless of above which kind of discharge head, when it with enters by the intrusive mass contact by the elasticity the inelastic stage, increases unceasingly along with the invasion load, can in invade in the crisp body to produce 3 kinds to symbolize the elastoplasticity invasion condition basic

No matter which of the above head, when it was invaded by the elastic into the non-elastic contact of stage, as the invasion increased load will be intrusive in crisp produces 3 basic kinds of Elasto-plastic invasion marked the State crack.

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