Тип публикации: статья из журнала
Год издания: 2012
Ключевые слова: blast-hole fracturing, Physico-Mathematical Model, fracture pattern, wave stresses, Cracks initiation
Аннотация: The results of the theoretical and experimental investigations of blast-hole electrofracture of concrete blocks have been presented. The method is based on the initiation of a pulsed electric discharge by the exploding wire inside the solid dielectric material. The wire application for the discharge initiation enabled to decrease tПоказать полностьюhe operating voltage of the generator, to increase the discharge gap and hence, the channel energy that leaded to the fracture build-up at electroburst. Having 20 kV pulse amplitudes and 50 mm wire length, 600x300x300 mm concrete blocks can be fractured. Specific energy deposition of ~ 50 kJ/cm 3 leads to pressure build-up of ~ 2,4-10 9 Pa in the discharge channel. Under the action of pressure, the highly conductive plasma channel expands and generates the shock wave, causing the mechanical stress formation in solid. The generator energy conversion into the plasma channel and into the wave of mechanical stresses in concrete has been considered. The dynamics of shock-wave propagation is investigated in the condensed media polyethylene-concrete depending on the mode of plasma channel energy release.
Журнал: Известия высших учебных заведений. Физика
Выпуск журнала: Т. 55, № 10-3
Номера страниц: 232-235
ISSN журнала: 00213411
Место издания: Томск
Издатель: Федеральное государственное автономное образовательное учреждение высшего образования "Национальный исследовательский Томский государственный университет"