РАСЧЕТНЫЙ АНАЛИЗ УДАРНЫХ ВОЗДЕЙСТВИЙ ПРИ ПРОЕКТИРОВАНИИ ОСНАСТКИ ДЛЯ ИСПЫТАНИЙ ОБОРУДОВАНИЯ

Abstract

Described are state-of-the-art approaches to solving the problems associated with impact testing of the equipment under development at the design stage. A brief description is provided of an experimental facility that models in different directions the impact loads equivalent to the effect of a blast wave originated near the object. The topicality is emphasized of developing - based upon the calculational mathematical analysis - the safe process tooling that prevents any possibility of accident consequences. The capabilities of ANSYS/LS-DYNA, a state-of-the-art computing system, are elucidated in brief. In ANSYS/LS-DYNA, full-scale mathematical 3D-modeling is implemented that enables a sufficiently deep and detailed analysis of dynamic processes through the use of a finite element method. Described are analytical and experimental methods of studying the deformation models of structural materials under static and dynamic loads, and determined are parameters of the mathematical models (Jonson-Cook models, Allen model, Rule & Jones, Cowper-Symonds model) from the LS-DYNA library. With account of the safety requirements in the regulatory documents, the deformation criteria are employed to assess the dynamic strength of the structural materials used to manufacture the tooling. Following the results of the mathematical analysis of the impact action, the tooling has been designed that enables successful testing at a safe level. The specified parameters have been reached that are in the technical requirements for the developed equipment - the obtained accelerations are maximally close to the calculated ones. Thanks to the integrated approach to the computational analysis that covered the engineering-and-design, physical-mechanical, mathematical and regulatory aspects, an opportunity has come to abandon the excessive conservatism and thus to fit well into the specified overall dimensions of the item and to reduce the specific metal content of the final product. Abandoning the multivariate progressive approximations in the analysis of the tooling at the design stage resulted also in the shortened design time and in the reduced design cost.