Defense hole system analysis about a finite plate with rivet joints subjected to biaxial loads

Abstract EN

In this research, a newly developed Defense Holes System (DHS) under biaxial loading in a finite plate with a row of circular holes is presented.

A systematic study based on first order optimization method is undertaken by utilizing the finite element analysis (FEA) to determine the optimum shape, location and size of the auxiliary defense hole system.

These parameters are examined in relation to plate dimensions for a number of plates with different cential-hole-diameter to plate width ratios, and biaxial loading with different loading ratios ranging from pure shear to uniaxial-loaded plate.

Maximum stress reductions from 7-23 % were demonstrated for biaxially-loaded plates.

With such reduction in the maximum stress level the improvement in fatigue life of a structural part can be very significant.

This significant reduction is made possible by introducing elliptical auxiliary holes close to the main holes in the areas of low stresses along the principal stress direction.

The defense system that is introduced has many advantages other than stress reduction like crack arrest, and weight reduction.

The FEA results were validated experimentally by applying an enlianced RGB-photoelasticity teclinique.

The photoelasticity experimental results and the FEA results show good agreement.