Determining the properties of a composite in a structure by the parametric-identification method

Identification of viscoelastic characteristics of composite materials on the basis of results of an experimental and theoretical analysis of the dynamic behavior of hemispherical shells

“…Such methods of identification of materials and models have been used to determine the effective elastic characteristics of composite materials on the basis of static experiments [1][2][3][4]. Among papers dealing with determining physical and mechanical characteristics in dynamic tests, we can note only the studies [5,6] where experimental results were analyzed and the damping characteristics of composite materials with explosive loading of rings and hemispherical shells were determined.…”

“…To derive the equations of motion of a hemispherical unfixed shell loaded by an outward pressure pulse, we use the variation equation of dynamics [7], which can be written in the following form with allowance for approximations (2) and the geometric (3) and physical (4) relations derived on the basis of these approximations:…”

Identification of the mechanical characteristics of composite materials from experimental data of shells of revolution

“…Moreover, these characteristics can be different for each product, which is associated, for example, with influence of the technological factors as well as operating conditions within a particular structure on the properties of materials. Some methods make it possible to determine the mechanical properties of composite materials by analyzing the data obtained from the tests on multilayered specimens (see, for example, [1][2][3][4]). Indirectly, they take into account the technological factors of producing the material, dependence of the properties of CM on the methods of forming the structure, as well as its operating conditions, and allow us to overcome these technical difficulties..…”