Metal-ring stretching under magnetic-pulse shock action

摘要

A study was conducted to demonstrate metal-ring stretching under magnetic-pulse shock action. It was shown that the ring fracture proceeded for a time essentially smaller than the first period of current oscillations in the ring. The approach was developed for a region of much shorter actions, which was of principal importance for studying dynamic durability under intense pulse actions. The investigation of the pulse-length effect on the fragile-fracture threshold under the magnetic-pulse treatment of PMMA and spheroplastics revealed an increase of this threshold for decreasing pulse length from 4.3 to 1 μs, while the crack grew faster for a larger pulse length. It was also shown that the specific energy of the PMMA fracture decreased sharply from 1 to 10 μs with increasing pulse length.