Approach to Studying the Strength and Determining the Yield Stress of Rocket and Space Engineering Structures
Keywords:mathematical and computer simulation, space rocket technology, strength, destruction
Introduction. Designing rocket structures requires computer modeling of their mechanical behavior in operating conditions. Based on the optimal design drawings obtained from computational experiments, a physical prototype has been made and tested. Depending on how successful the prototype passes the tests, the serial production of such structures is launched. The share of computer modeling in this process is constantly growing, since experimental studies are quite limited and extremely expensives.
Problem Statement. Estimates of structural strength significantly depend on the accuracy and reliability of data on their stress-strain state under operating conditions. Therefore, the development of software for assessing the stress-strain state of structures based on adequate mathematical models is extremely relevant.
Purpose. The purpose is to develop a method for studying the strength of complex structures of rocketry under
intense loads and to determine ultimate breaking loads according to the results of computer modeling.
Materials and Methods. The problem is formulated within the framework of the geometrically nonlinear
theory of thermoelastic plasticity, assuming that displacements and strains are large and stresses exceed the ultimate breaking load of materials. To solve the formulated problem, the finite element method has been used.
Results. A method for studying the stress-strain state of rocket complex structures under intense loads has
been developed to estimate the ultimate breaking loads of such structures according to the results of computer modeling based on high-precision mathematical models. It has been successfully tested at the Yangel Pivdenne Design Office while designing fuel tanks of a launch vehicle.
Conclusions. The developed method makes it possible to significantly reduce or to completely abandon experiments during which the structure is carried to failure.
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