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Determination of Subcritical Crack Growth Parameters Using Double Torsion Test
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Subcritical crack growth is an environmental-assisted crack growth. It takes place over long periods of time and its crack velocity is very slow. The characteristics of subcritical crack growth are evaluated by determining the subcritical crack growth parameters. The subcritical crack growth parameters A and n can be estimated from the experimental relation between the crack velocity and the stress intensity factor. In this research, the subcritical crack growth parameters for Coconino sandstone are determined using a double torsion test. The subcritical crack growth parameter n is determined to be 33 with standard deviation of 11, and A was determined to be 1.15×10-4 to 1.45 m/s. The parameter n values seem reasonable compared with other literature, but the parameter A values are widely scattered. Thus the double torsion test may not be suitable for determining the parameter A. The fracture toughness is also determined to be 0.686 MPa√m and this value is compared with the value from the chevron bend specimen.
Abstract
Subcritical crack growth is an environmental-assisted crack growth. It takes place over long periods of time and its crack velocity is very slow. The characteristics of subcritical crack growth are evaluated by determining the subcritical crack growth parameters. The subcritical crack growth parameters A and n can be estimated from the experimental relation between the crack velocity and the stress intensity factor. In this research, the subcritical crack growth parameters for Coconino sandstone are determined using a double torsion test. The subcritical crack growth parameter n is determined to be 33 with standard deviation of 11, and A was determined to be 1.15×10-4 to 1.45 m/s. The parameter n values seem reasonable compared with other literature, but the parameter A values are widely scattered. Thus the double torsion test may not be suitable for determining the parameter A. The fracture toughness is also determined to be 0.686 MPa√m and this value is compared with the value from the chevron bend specimen.
참고문헌 (19)
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