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The influence of specimen size and stress field on energy loss away from the crack tip was studied using dynamic photoelasticity and fracture mechanics. The method of analysis utilized a balance of energy in the system. Experiments were conducted with three different sizes of modified compact tension (MCT) specimens, and it was found that energy loss increased with specimen size. Energy loss increased from 34 percent of total available energy to 48 percent as the specimen size was doubled.
The influence of stress field on energy loss was modelled by using different starter crack lengths in MCT specimens. It was observed that energy loss as well as crack propagation behavior are dependent on the stress field into which the crack propagates.
energy loss, photoelasticity, fracture mechanics, Homalite 100, specimen size, stress field, inefficiency ratio, compliance
Assistant professor, University of Rhode Island, Kingston, R.I.
Professor and chairman, University of Maryland, College Park, Md.