Finite Element Analyzing of the Effect of Crack on Mechanical Behavior of Honeycomb and Re-entrant Structures

Year 2020, , 1015 - 1025, 01.12.2020

Berkay Ergene , Bekir Yalçın

https://doi.org/10.2339/politeknik.534103

Cited By: 4

Abstract

Developments in
technology require the new materials, lighter and more efficient structures and
also new manufacturing methods. In this study, after doing researches about
topology optimization, regular honeycomb and re-entrant structures; the regular
honeycomb and re-entrant structures were designed, and then Ti-6Al-4V material
was chosen for these structures in finite element (FE) analyzing. The three
different rib thickness values (t) of 1 mm, 1.5 mm and 2 mm were assigned for
honeycomb and re-entrant structures in FE analyses. Also, the crack was created
on the models, and then 2-D FE analyses were done for both cracked and
un-cracked honeycomb and re-entrant structures under tensile forces through y
axis. Afterwards, the effect of crack on stress intensity factor, stresses,
strains and displacement were obtained and characterized the auxetic behavior
of the regular honeycomb and re-entrant structures. Furthermore, increase in
rib thickness decreases stress and strains for each structure. Moreover, re-entrant
structures have negative Poisson’s ratio due to their geometric properties and
the notable effect of crack on the equivalent stress in re-entrant was emerged
in comparison with honeycomb structure. 
As a result, the only possible fracture in honeycomb for thickness of 1
mm might be observed owing to stress intensity factor obtained from analyses
bigger than fracture toughness of honeycomb structure.    

Keywords

Auxetic behavior, crack, negative Poisson’s ratio, stress intensity factor

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