575 / 2019-03-20 08:38:42

Experimental investigation of dynamic fragmentation of laser shock-loaded by soft recovery and X-ray radiography

laser shock-loading, fragment, soft recovery, X-ray radiography

全体主题 > High Pressure Physics and Materials Science

Dynamic fragmentation of metal under shock pressure is an important issur for both fundamental science and practical applications. And in recent decades, laser provides a promising shock loading technique for investigating the process of dynamic fragmentation under extreme condition application of high strain rate. Our group have performed experimental investigation of dynamic fragmentation under laser shock loading by soft recovery and X-ray radiography at Shenguang-III(SGIII) prototype laser facility.
The fragments under different loading pressures were recovered by Ploy4-methy1-1-Pentene (PMP) foam, and the size,shape and penetration depth of the fragments were analyzed by X-ray micro-tomography and the improved watershed method. The experiment result showed that the bilinear exponential distribution is more appropriate for respresenting the fragment size distribution.
We also developed X-ray radiography technique which can provide a powerful means for dignostic of the evolution of dynamic fragmentation. Owing to its inherent advantage over optial imaging systems. X-ray radiography can pententially determine quantitatively material densities by measuring the X-ray transmission.
Our group investiagted dynamic process of microjetting by X-ray radiography technique, the recorded radiographic images show clear microjetting from the triangular grooves in the free surface of tin sample.