Strength of orthotropic plates with free and loaded holes

Аuthors

Vestyak V. A.¹, Martirosov M. I.¹, Smagin E. .^2*

1. Moscow Aviation Institute (National Research University), 4, Volokolamskoe shosse, Moscow, А-80, GSP-3, 125993, Russia
2. PJSC Yakovlev , 68, Leningradskiy prospect, Moscow, 125315, Russia

*e-mail: smagin_ei@mail.ru

Abstract

The intensive introduction of orthotropic materials in various fields of industry shows the great potential of polymer composite materials (PCMs) in terms of strength and weight efficiency.  The use of PCM is accompanied by studies of the properties of the material and structure at the joints.  The paper presents the results of computational and experimental studies of the strength of orthotropic plates with free and loaded holes.  Various test methods are considered for samples simulating the operation of a structure with passing and bearing loads, as well as samples simulating the combined action of the above loads.  For various test methods, types of samples and loading schemes are presented.  Experimental studies of the stress-strain state and residual strength of PCM based on an epoxy matrix and high-modulus fiber were carried out on samples with free and loaded holes.  Approaches are presented for assessing the area of the load-bearing capacity of a double-shear connection, taking into account the combined effect of crushing and passing loads.  Finite element models were developed and calculations were carried out for the load-bearing capacity of an orthotropic plate with a hole.  The boundary conditions for modeling a numerical experiment are presented, and the strength criteria used in finite element calculations are described.  During the analysis, the reasons for the different behavior and nature of destruction of the samples were considered, and a layer-by-layer analysis of strength was presented.  The advantages of studying the bearing capacity of plates and joints under combined loading are shown.  A comparison was made of experimental data for various reinforcement schemes, taking into account the combined action of crushing and passing load and without it.  It is shown that the calculated and experimental results are in satisfactory agreement with each other.

Keywords:

strip with a hole, polymer composite materials (PCMs), crushing, transmitted load, tests, failure criteria for PCMs, stress‑strain state, LS‑DYNA software package.

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