Choosing striker design and material with the use of finite element method packages in engineering

Abstract

The purpose of the article is to consider the issues of strength calculation of products (on example of a striker) receiving short-term loads. The method for calculating the strength of the main structural element of the mechanism of the real calculation problem of a striker- a device that is used together with a construction perforator is presented. The calculations allow to determine the best dimensions of the striker head shape. In this case, the perforator sets a short-term force acting on the tool (striker), which is spent on moving and heating of the tool elements and partially returns back to the perforator mechanism. The impact energy can reach up to 20J, the frequency of the construction perforator shock load is in the range of 17-35 Hz. The experiment has showed that in addition to static strength calculations, it is also necessary to carry out a frequency analysis of the critical values of eigen frequencies of the structure. The results obtained are analyzed for normal and maximum allowable stresses. A method for determining the static load of the structure and its dynamic coefficient under the influence of periodic shock load is developed. The performed calculations of static loading and harmonic analysis allow to determine the structural strength of the designed product, select workpiece material and determine the dynamic coefficient. The proposed calculation method can be used both for solving the problem described in the article and for the whole class of problems with the shock load, which take into account the time of force application or duration of the force pulse.