End effect and near-surface buckling in a laminate composite material compres sed by a surface load.

Bystrov, VM
Dopov. Nac. akad. nauk Ukr. 2019, 10:29-37
https://doi.org/10.15407/dopovidi2019.10.029
Section: Mechanics
Language: Russian
Abstract: 

Using the basic relations of the three-dimensional linearized theory of stability in the framework of the piecewise- homogeneous medium model, the problem of stability of a layered composite material under compression of reinforcing layers by a surface load is solved. The case of a non-uniform subcritical state associated with an end effect in the region of application of the load is considered. A computational model is used for the boundary conditions on the lateral sides of a multilayer sample made of a composite material, which correspond to the symmetry conditions. The influence of the end effect on the attenuation of forms of a near-surface instability at diffe rent statically equivalent loads of reinforcing layers of a composite material is studied. For the numerical solution of the problem, the grid method based on the modified variation-difference approach is applied.

Keywords: crumpling of ends, end effect, layered composite material, longitudinal compression, mode of stability loss, multilayer representative element, near-surface buckling, surface load, three-dimensional linearized theory of stability
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