Probabilistic modelling of Container for Discrete Delivery of Extinguishing Agents based on a set of computational simulations

Abstract

The paper is defined the probability of failure the destruction of the container (capsule) with different types of fire-extinguishing filling under impact loading depending on external loads and random values of material properties by computational methods. Container (capsule) for discrete delivery of extinguishing agents in the form of a sphere is made using 3D printing from PLA-plastic. In order to determine the critical fall velocity for the destruction of the sphere, the stresses that occur in it under shock load had been determined. The study of the impact load effect determined the critical levels of the velocities of the falling sphere at which the failure occurs. To determine the parameters of the stress state, a explicit dynamic analysis was performed using the finite element method. A geometric and CE model of the sphere and the area of incidence was developed. The state of the sphere when falling at different velocities is analyzed. Three calculation models were considered, taking into account the filling of the sphere with water, fire-extinguishing powder and without filling. The fall velocity varied between 10 m/s and 30 m/s. The probability of failure of container had been defined for three cases of filling.