K/sub ID/ values deduced from shear force measurements on DCB specimens
Conference
·
OSTI ID:5926061
Time varying shear force measuring techniques have been used to investigate the dynamic critical stress intensity factor versus crack propagation velocity curve. The product of the shear force at the loading end times the square root of the loading time on a rapidly wedged DCB specimen is uniquely related to the critical bending moment at the crack tip. Static compliance measurements on side grooved specimens were incorporated into a Bernoulli-Euler beam model for calibration purposes and to eliminate the inappropriate built-in beam assumption. The compliance calibration shows a crack length shift from a measured crack length to a beam model length at a fixed compliance value. This shift does not effect the magnitude of the calculated critical bending moment at the crack tip when the load and the load point displacement are measured quantities. The effective crack length is calculated from the beam model length with the length shift correction. The K/sub ID/ values (calculated from the critical bending moment) versus crack velocity have been investigated at several test temperatures for a low carbon steel. K/sub ID/ values show a generally decreasing trend when crack velocity increases. K/sub IC/ at fast fracture initiation, is larger than the corresponding K/sub ID/ value for all tests recorded.
- Research Organization:
- Rochester Univ., NY (USA)
- OSTI ID:
- 5926061
- Report Number(s):
- COO-2422-20; CONF-7811148-2
- Country of Publication:
- United States
- Language:
- English
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