The initiation of crack growth was observed in single edge notched tensile specimens under plane strain conditions. The shape of the deformation zone varied from being balloon-like above 12 MPa and nearly planar below but neither shape conformed to that predicted by the conventional shear type yield criteria. The initial damaged zone grew at a constant velocity with a stress dependence ofV=V 0 σ n. The spectrum of damage morphologies that preceed crack growth consists of a leading edge of crack-like pores followed by a region of increasing fibrillation which is terminated by a region of increasing fibril fracture.
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Bhattacharya, S.K., Brown, N. The initiation of crack growth in linear polyethylene. J Mater Sci 20, 2767–2775 (1985). https://doi.org/10.1007/BF00553038
- Plane Strain
- Strain Condition