Crack propagation with crack tip critical bending moments in DCB specimens
Conference
·
OSTI ID:7124829
Rapidly wedged, double cantilevered beam specimens have a critical bending moment as a propagating fracture criterion in the limit of Bernoulli-Euler beam theory. The magnitude of the critical bending moment is calculated from a fully dynamic analysis of crack propagation. The shear force, in the beam at the constant displacement rate end of the DCB specimen, multiplied by the square root of the loading time is related to the critical bending moment. Experimental measurements of the time dependence of the shear force were used to calculate the specific fracture surface energy versus crack velocity. The crack velocity in a single specimen decreases with increasing time, it varies by a factor of 5 and is typically 0.01 of ..sqrt..E/rho. Details of the experimental measurements for brittle and ductile fractures, including stress intensity values versus crack velocity are described.
- Research Organization:
- Rochester Univ., NY (USA). Dept. of Mechanical and Aerospace Sciences
- OSTI ID:
- 7124829
- Report Number(s):
- COO-2422-05; CONF-7606110-1
- Country of Publication:
- United States
- Language:
- English
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