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

Yıl 2020, , 1015 - 1025, 01.12.2020

Berkay Ergene , Bekir Yalçın

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

Cited By: 4

Öz

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.    

Anahtar Kelimeler

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

Kaynakça

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