Experimental investigation of dynamics of "M-liquid" patterns structure at dynamic and quasi-static loading
Abstract
Magma state before explosive eruption is characterized by high temperature and pressure. Fast decompression generates in magma the process of gas desorption which is accompanied by temperature decreasing and crystallization. To simulate a bubbly cavitation development up to the magma state of foam type and its following fracture for the conditions mentioned the special experimental methods were suggested. The pattern structure dynamics of "M-liquid" (special solutions as viscous analogies of magma) under dynamic and quasi-static tensile stresses are studied by hydrodynamic shock tube methods within the framework of two statements. First of them is a "M-liquid" pattern fracture by a wire explosion located inside of pattern near its free surface. This statement allows to study in details the process of cavitation development up to formation of foam structure of liquid pattern using high-speed photo camera (up to 1 million fr/sec). Second statement connected with the study of "M-liquid" drop fracture (about 1 cm in diameter) under ultrashort (a few microsecond) shock wave loading allows to analyze the transformation of foam structure to space cell one and its following fracture on small fragments. The results of pattern behaviour under quasi-static decompression will be also discussed.
- Publication:
-
EGS - AGU - EUG Joint Assembly
- Pub Date:
- April 2003
- Bibcode:
- 2003EAEJA......850K