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Shock and Vibration
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Shock and Vibration
/
2019
/
Article
/
Fig 2
/
Research Article
Energy Evolution and Acoustic Emission Characteristics of Sandstone Specimens under Unloading Confining Pressure
Figure 2
Curves of (
σ
1
–
σ
3
)-time,
σ
1
-time, and
σ
3
-time of the specimen (
σ
3
= 15 MPa).