Influence of orientation on fracture toughness and tensile moduli in Berkeley granite
Conference
·
OSTI ID:5653754
Fracture toughness and tensile modulus values for Berkeley granite show pronounced orientation dependence. Apparent fracture toughness values (K{sub Q}) correspond to natural strong and weak planes in the rock: cracks propagated in the head grain (strongest) plane have K{sub Q} = 1.81 MPa ..sqrt..m, those grown in the rift (weakest) plane have K{sub Q} = 1.01 MPa ..sqrt..m and those in the grain (intermediate) plane have K/sub Q/ = 1.40 MPa ..sqrt..m. These directional K/sub Q/ data also correlate with tensile modulus values, E, which are 50.7 GPa,, 21.6 GPa and 39.3 GPa, respectively. An empirical relationship between K/sub Q/ and E is demonstrated. Monitoring of acoustic emission events shows promise as a detector of onset of crack growth.
- Research Organization:
- Los Alamos Scientific Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5653754
- Report Number(s):
- LA-UR-80-827; CONF-800507-3
- Country of Publication:
- United States
- Language:
- English
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