THE INFLUENCE OF MATERIAL DEFECTS ON DYNAMIC FRACTURE

An examination of dynamic fracture in iron, low carbon steel and high purity Al-Cu-Mg alloy under biaxial strain conditions showed that in Ferrovac E iron and high purity alloys, dynamic fracture is associated with intergranular failure. In commercial alloys, however, dynamic fracture occurs by void...

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Bibliographische Detailangaben
Hauptverfasser: FYFE, Ian M, Polonis, Douglas H
Format: Report
Sprache:eng
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Zusammenfassung:An examination of dynamic fracture in iron, low carbon steel and high purity Al-Cu-Mg alloy under biaxial strain conditions showed that in Ferrovac E iron and high purity alloys, dynamic fracture is associated with intergranular failure. In commercial alloys, however, dynamic fracture occurs by void generation at brittle second phase impurity particles, and the subsequent void interconnection. Static and dynamic tests on thin walled cylinders indicate that dynamic pre-straining has negligible effect on the strain at failure in 6061-T4 aluminum, but reduces the failure strain in copper, the latter result possibly due to the increased yield strength caused by dynamic loading. In specimens dynamically loaded to failure plastic instability occurred at the same strain value as that of the static case. (Author)