Abstract
An investigation of the kinematics of an active zone (or process zone) evolution in polystyrene during fatigue fracture is reported. Experiments were conducted on tension-tension singleedge-notched specimens of 0.25 mm thickness. Craze characterization was carried out on thinned sections of the active zone at six consecutive configurations. Analysis consisted of quantitative comparison of ratios of the inertia moments of the active zone at consecutive configurations. The results indicate that for the particular loading history considered, damage evolution can be approximated by a linear transformation of the space variables. The fracture process can be described by the translation and deformation of the active zone. Consequently, the corresponding energy release rates can be expressed by the J 1, M and N ij integrals. The results of this analysis agree with the kinematics proposed by the crack layer model.
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Botsis, J., Zhang, X.Q. The kinematics of an active zone during fatigue crack layer growth in polystyrene. J Mater Sci 26, 1253–1258 (1991). https://doi.org/10.1007/BF00544463
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DOI: https://doi.org/10.1007/BF00544463