Investigation of mechanical properties of electroless nickel plated micro-lattice structures

Yıl 2020, Cilt: 35 Sayı: 4, 1783 - 1798, 21.07.2020

Recep Gümrük Altuğ Uşun

https://doi.org/10.17341/gazimmfd.586438

Öz

In this study, mechanical properties of electroless nickel coated micro
lattice structures were parametrically studied with both experimental and
finite element methods. The micro lattice structures are produced of micro
struts with a diameter of approximately 200 µm by selective laser melting (SLM)
and are made of 316L stainless steel in the form of body centered cubic (BCC)
structure. With electroless nickel coating method, a coating thickness of 17 µm
was obtained and as a result, compression tests showed a 50% increase in
specific elasticity modules and a 75% increase in specific strength for micro
lattice structures. The effects of coating thickness and cell size on the
mechanical performance of micro lattice structures were investigated by finite
element method. Material parameters required for finite element method were
obtained by using nano-indentation tests on the coating and inverse finite
element algorithms. Studies showed that; The mechanical and failure properties
of the coating material have a significant effect on improving the mechanical
properties of the coated micro lattices. As a result, it was determined that,
with higher the specific strength and ductility of the coating material, higher
mechanical properties of the stainless-steel micro lattice structures can be
achieved.

Anahtar Kelimeler

Electroless Nickel Coating, Selective Laser Melting, Micro Lattice Structures, Inverse Finite Element Analysis, Nano-indentation

Akımsız nikel kaplanmış mikro kafes yapıların mekanik özelliklerinin incelenmesi

Öz

Bu çalışmada, akımsız
nikel ile kaplanan mikro kafes yapıların mekanik özellikleri hem deneysel hem
de sonlu elemanlar yöntemi kullanılarak parametrik olarak çalışılmıştır.
Kullanılan mikro kafes yapılar seçici lazer ergitme (SLM) yöntemi ile yaklaşık
200µm çapında mikro tellerden oluşmakta olup, 316L paslanmaz çelik malzemeden
hacim merkezli kübik (BCC) yapı şeklinde üretilmiştir. Uygulanan akımsız nikel
kaplama yöntemi ile yaklaşık olarak 17 µm kaplama kalınlığı elde edilmiş ve
bunun sonucunda gerçekleştirilen basma testleri sonucunda mikro kafes yapıların
spesifik elastisite modüllerinde yaklaşık %50 ve spesifik mukavemetlerinde ise %75
artış elde edilmiştir. Kaplama kalınlığının ve hücre boyutu arasındaki ilişkilerin
mikro kafes yapıların mekanik performansları üzerine etkileri sonlu elemanlar
analizleri ile parametrik çalışmalar ile incelenmiştir. Sonlu elemanlar
yönteminde malzeme modelleri için gerekli malzeme parametreleri kaplama için nano-indentasyon
testler kullanılarak ve özgün olarak geliştirilen tersine sonlu elemanlar
algoritması ile elde edilmiştir. Yapılan çalışmalar gösterdi ki; kaplama
malzemesinin mekanik ve hasar özelliklerinin kaplanmış mikro kafeslerin mekanik
özelliklerinin iyileştirilmesinde çok ciddi bir etkiye sahiptir. Sonuç olarak
kaplama malzemesinin spesifik mukavemeti ve sünekliği ne kadar yüksek ise
paslanmaz çelik mikro kafes yapıların spesifik mekanik özelliklerinin o
derecede iyileşme göstereceği belirlenmiştir.

Anahtar Kelimeler

Akımsız Nikel Kaplama, Seçici Lazer Ergitme, Mikro Kafes Yapılar, Tersine Sonlu Elemanlar, Nano-indentasyon

Kaynakça

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