Plastic zones at the tips of inclined cracks in glassy polymers under small scale yielding

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Abstract
A thorough study of the shape and size of plastic zones developed around cracks subjected to combined opening‐mode and sliding‐mode loading conditions in glassy polymers under small scale yielding was undertaken. Two pressure‐modified von Mises yield criteria which take into account the characteristic behavior of glassy polymers expressed by the dependence of their yield locus on the hydrostatic stress component and the difference in their tensile and compressive yield stresses were used. The case of an infinite plate subjected to a uniaxial uniform stress at an arbitrary inclination with respect to the axis of the crack was considered. From the whole study useful results concerning the dependence of the shape and size of plastic zones on the crack inclination angle, the Poisson's ratio, and the ratio of the compressive to tensile yield stress of the plate were derived.

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