Technique of Numerical Experiments in Design Calculations of Helicopter Mechanical Systems

On the possibility of structural fatigue properties estimation at the early stages of design analysis

“…In this case, the stress intensity fields may be smoothed, for example, by laying up the additional layers of composite material on the developed structure of flexible element. At the same time, it is possible to solve the problem stated by analyzing the stress strain state in large displacements with the use of a specially developed finite element [2]. As noted earlier, calculation of rational structural parameters provides a possibility to load the structural elements up to maximum and decrease the general stress level, when the mass is being reduced and it is a need to raise the structure rigidity.…”

“…2a) will be obtained by calculating the system of Eqs. (2); that makes it possible to determine the law of stress field variation according to the strength theory chosen as well as the law of loading variation in the joints of mechanism links (see Fig. 2 b).…”