Numerical modelling of bolted composite joints. Bolts rigidity effect on normal stresses in the composite layers

Y. Dyfuchyn,K. Rudakov

doi:10.20535/2521-1943.2017.79.95756

Abstract

Modern finite element programs have the opportunity to create finite element models (FEM) by gluing uncoordinated meshes of finite elements. This allows, in particular, to obtain relatively small 3D models of polymeric composite materials (PCM) in bolted connections for PC calculations, in which the PCM in the hole zones is modeled layer by layer, and at some distance from them - approximately, according to the theory of the effective module. In previous model calculations of single-shear two-row bolted connection with PCM (contact task) with detailed layer-by-layer modeling of the PCM structure in the hole zones, regularities were revealed for the distribution of contact forces in the bolt-hole surface contact, bolt stresses and near- contacting in the holes with the lateral surfaces of the bolts. In the article, based on numerical calculations, the regularities of changes in normal stresses on the contact surfaces of holes in PCM, in laying layers at 0 and 90 degrees, were found, depending on the rigidity of the bolts.

Highlights

The results of numerical modeling of the sample of bolted-type connection with polymeric composite materials (PCM) (Figure 1) are provided in [1,2,3]
The sample consists of two PCM plates and a U-shaped beam made of aluminum alloy connected by four titanic bolts
Reduce the finite elements model, another head of the bolt was modeled instead of a nut threaded. This replacement could not prevent the achievement of the goal of the work The force of screwing the bolted joint was modeled by reduction of the distance between bolt heads by a value of = 0.08 mm (Figure 2b [1]), which caused a force of about

Summary

Introduction

The results of numerical modeling of the sample of bolted-type connection with PCM (Figure 1) are provided in [1,2,3] Such samples are used to test the bolted connection with PCM for fatigue. In order to test sample for fatigue characteristics of the bolted connection with PCM reduce the finite elements model, another head of the bolt was modeled instead of a nut threaded. This replacement could not prevent the achievement of the goal of the work The force of screwing the bolted joint was modeled by reduction of the distance between bolt heads by a value of = 0.08 mm (Figure 2b [1]), which caused a force of about. Six structures of composite material named as PCM-0, ..., PCM-V (Table 4 [1]) were modeled

Structures of composite materials

Conclusions