Spall plane formation near spall threshold for different metals

Nahme, Hartwig
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p517
Academic Journal
Using planar-plate impact methods in combination with a VISAR, various metals including armor steels have been investigated with respect to their response to shock loading and their spall strength. Often two different failure modes are visible especially near spall threshold conditions. The spall plane formation process seems to take place in two steps: In a first step the material only fails, where the material strength is reduced for the amount of the strength variation across the material which may be due to voids, inclusions and segregation lines. The resulting cracks, which are orientated parallel to each other are connected by shear failure of the remaining material in a second step. The results of the VISAR - measurements will be presented indicating, that the spall process evolves as described above. SEM examinations of softly recovered samples clearly show different failure modes of the materials also at higher stress levels, indicating the two-step-process may occur at higher stress levels also.


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