Spall and dynamic elongation at ultra high strain rate was investigated using short pulsed laser induced shock waves in metallic foils. The controlled stepwise increase in laser energies in a one-dimensional shock wave geometry was used to find the stages of damage evolution from incipient to complete perforation of the target. A phenomenological model was developed for laser produced spall in the 100 kilobars regime. By substituting experimental values in the model it was found for pure aluminum a spall pressure of 26±6 kbar and for pure copper 28±6 kbar at a strain rate of about 3×107 sec-1. The experimental results and results calculated with the model were compared to simulations and good agreement was found. A novel method was developed to measure the total elongation at fracture at ultra high strain rate.
|Number of pages||7|
|Journal||Isr J Technol|
|Issue number||3 -4,Pt B|
|State||Published - 1988|
|Event||Fourth Israel Materials Engineering Conference IMEC IV - Beer Sheva, Isr|
Duration: 7 Dec 1988 → 8 Dec 1988