Open AccessSIMULATION MODELING OF DESTRUCTION OF TYPICAL FASTENING ELEMENTS FOR DETONATION
Author(s) -
Maryna Chernobryvko,
Svitlana Svetlichna
Publication year - 2020
Publication title -
molodij včenij
Language(s) - English
Resource type - Journals
eISSN - 2313-2167
pISSN - 2304-5809
DOI - 10.32839/2304-5809/2020-11-87-28
Subject(s) - structural engineering , bolted joint , detonation , process (computing) , shock (circulatory) , container (type theory) , engineering , joint (building) , explosive material , finite element method , mechanical engineering , computer science , medicine , chemistry , organic chemistry , operating system
A number of precautions are used to prevent injuries to people and industrial equipment during accidents at chemical plants. One of them is based on the use of protective containers for the storage of explosives. A typical container consists of a main structure and a lid of the loading hole. This cover is fixed to the container with fasteners based on bolted connections. To ensure the normative strength of such a connection at the design stage, an analysis of its dynamic strength is performed and the critical loads that cause the destruction of the structure are determined. To reduce the cost of design work, it is advisable to replace a number of experimental tests with numerical studies and simulate the process of destruction. Therefore, the development of methods for numerical analysis of dynamic strength and integrity of typical fasteners based on bolted joints is an urgent problem. Simulation of the destruction of composite structures based on bolted joints should adequately reflect the complex of mechanical loads. First, it is a static load due to the assembly of the bolted connection. Secondly, it is high-speed dynamic loads due to the action of a detonation shock wave. For mathematical modeling of such processes, it is necessary to take into account the influence of the load speed on the mechanical properties of metals in the bolted joint. An important role in modeling the destruction process is played by the correct choice of the criterion of destruction of the structural material. According to the analysis of previous studies, the criterion of maximum plastic deformation was chosen. For the numerical implementation of the developed mathematical model of high-speed deformation and destruction of the folded fastening structure on the basis of bolted connection taking into account nonlinear properties of mechanical characteristics of materials and influence of previous loadings during assembly of a design the finite element method is chosen. The application of the proposed technique at the design stage of protective containers allows to reduce the number of experimental tests and thus reduce the development time and to reduce its cost.