Abstract
The static tensile testing of notched flat bars of polycarbonate, polyvinylchloride and polymethyl methacylate has been carried out for a wide range of notch radii and notch depths. Sharply notched specimens of PC and PVC failed in brittle manner after the formation of a small crack at the tip of plastic zone. Bluntly notched specimens of PC and PVC failed in fully ductile manner with large shear bands. All specimens of PMMA failed in brittle manner. The predominant factor for determining the fracture mode of ductile to brittle transition is the notch root radius in the case of a constant thickness. Experimental results were discussed in terms of the maximum elastic stress at the notch root from the standpoint of linear notch mechanics. For specimens failed in brittle manner, it is shown that the maximum elastic stress is the one-to-one correspondence to the notch root radius, and is independent of notch depth and plate thickness. The fracture criterion of notched flat bars mentioned above holds commonly for PC, PVC and PMMA.
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