Оцінка критичних характеристик міцності і стійкості руйнування пружного тіла з порами та тріщинами

In work with use of the applied theory of accidents the analytical estimation of mechanical and strength characteristics of a composite is made taking into account its porosity. The problem of stable critical growth of a short crack at transition to the macroscopical sizes is investigated. Qualitative changes of potential energy of a crack with zones of predestructions in its tops are as a result estimated. Also analytical parities for definition of critical parameters of a microcrack and border of its stable growth till the macroscopical sizes are established.