Effect of the skin and core morphology on the fatigue crack propagation behaviour was studied in injection-moulded polyamide 6.6 specimens in both the as-received dry state and a water-saturated, wet state. The morphology was visualised by polarised light micrographs which revealed a band structure in the specimens. Fatigue measurements in tensile-tensile mode were performed on compact tension specimens notched either parallel or perpendicular to the mould fill direction. PARIS-type fatigue crack propagation curves were established for the skin and core region. These curves and the resulting fatigue fracture surfaces (studied by scanning electron microscopy) were interpreted on the basis of the processing induced microstructural details and their alterations by water uptake.
|Number of pages||6|
|Journal||Plastics and Rubber Processing and Applications|
|Publication status||Published - dec. 1 1989|
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