Enhancing the Fracture Toughness of Biomimetic Composite Through 3D Printing

2021 ◽  
pp. 215-244
Author(s):  
Sugumari Vallinayagam ◽  
Karthikeyan Rajendran ◽  
A. K. Ramya ◽  
R. R. Remya ◽  
Leeba Balan
Keyword(s):  
Fracture Toughness ◽  
3D Printing

scholarly journals Bio-Inspired Toughening of Composites in 3D-Printing

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4714
Author(s):  
Johannes Stögerer ◽  
Sonja Baumgartner ◽  
Alexander Hochwallner ◽  
Jürgen Stampfl
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
3D Printing ◽  
Hybrid Material ◽  
Matrix Material ◽  
Marine Species ◽  
Light Sources ◽  
Control Groups ◽  
Elongation At Break ◽  
Organic Layers

Natural materials achieve exceptional mechanical properties by relying on hierarchically structuring their internal architecture. In several marine species, layers of stiff and hard inorganic material are separated by thin compliant organic layers, giving their skeleton both stiffness and toughness. This phenomenon is fundamentally based on the periodical variation of Young’s modulus within the structure. In this study, alteration of mechanical properties is achieved through a layer-wise build-up of two different materials. A hybrid 3D-printing device combining stereolithography and inkjet printing is used for the manufacturing process. Both components used in this system, the ink for jetting and the resin for structuring by stereolithography (SLA), are acrylate-based and photo-curable. Layers of resin and ink are solidified separately using two different light sources (λ1 = 375 nm, λ2 = 455 nm). Three composite sample groups (i.e., one hybrid material, two control groups) are built. Measurements reveal an increase in fracture toughness and elongation at break of 70% and 22%, respectively, for the hybrid material compared to the control groups. Moreover, the comparison of the two control groups shows that the effect is essentially dependent on different materials being well contained within separated layers. This bio-inspired building approach increases fracture toughness of an inherently brittle matrix material.

scholarly journals Strengthening in fracture toughness of a smart material manufactured by 3D printing

2018 ◽  
Vol 51 (11) ◽  
pp. 1353-1358 ◽  
Author(s):  
Pietro Lanzillotti ◽  
Julien Gardan ◽  
Ali Makke ◽  
Naman Recho
Keyword(s):  
Fracture Toughness ◽  
3D Printing ◽  
Smart Material

Study of the anisotropy of the properties of the ceramic cutting insert obtained by the LCM technology of 3D printing from the composite Al2O3/ZrO2 (ZTA)

2021 ◽  
Vol 87 (11) ◽  
pp. 64-69
Author(s):  
G. V. Shcherbak ◽  
A. A. Murashov ◽  
K. E. Smetanina ◽  
M. M. Vostokov ◽  
M. S. Boldin
Keyword(s):  
Fracture Toughness ◽  
Phase Composition ◽  
3D Printing ◽  
Bending Test ◽  
Indentation Method ◽  
Load Range ◽  
High Adhesion ◽  
Cutting Insert ◽  
3D Printed ◽  
Knoop Indenter

The anisotropy of the properties of a ceramic cutting insert (for three faces) obtained by the lithography-based technology from the Al2O3 + ZrO2 composite has been studied. The study was carried out using the indentation method and Mayer’s law. This method, in contrast to the bending test, excludes the sample destruction. All the studies were carried out on three faces of a ceramic cutting insert made of a composite Al2O3 + ZrO2. The behavior of the Mayer index was studied in the range of loads from 2 to 20 kg and from 0.2 to 1 kg. The results of studying the density, phase composition and microstructure of each face of the sample are presented. The study of the adhesion of the printed layers were also carried out using a Knoop indenter. No anisotropy of the hardness was observed in the load range up to 10 kg. It is shown that a layered structure present in the sample, contributes to the hardness anisotropy under the load of 20 kg and more. No anisotropy of the fracture toughness is observed in the load range of 2 – 20 kg. The results of using a Knoop indenter revealed a high adhesion between 3D printed layers. Studies using a Knoop indenter have indicated high adhesion between the layers of 3D printing.

scholarly journals A Method to Improve the Fracture Toughness Using 3D Printing by Extrusion Deposition

2016 ◽  
Vol 2 ◽  
pp. 144-151 ◽  
Author(s):  
Julien Gardan ◽  
Ali Makke ◽  
Naman Recho
Keyword(s):  
Fracture Toughness ◽  
3D Printing

3D printing of biomimetic composites with improved fracture toughness

2019 ◽  
Vol 173 ◽  
pp. 61-73 ◽  
Author(s):  
Zian Jia ◽  
Lifeng Wang
Keyword(s):  
Fracture Toughness ◽  
3D Printing

R-curve of La2O3 doped Zirconia Toughened Alumina Composites Prepared via Stereolithography based 3D Printing

2020 ◽  
Author(s):  
Haidong Wu ◽  
W. Liu ◽  
Meipeng Huang ◽  
Jianwei Liang ◽  
Di An ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
3D Printing ◽  
Crack Size ◽  
Liquid Precursor ◽  
Zro2 Phase ◽  
Alumina Composites ◽  
3D Printed ◽  
First Time ◽  
New Phase ◽  
Zirconia Toughened Alumina

Abstract In this study, we combined liquid precursor infiltration of high introduction amounts of bi-additives (20wt%) and stereolithography-based 3D printing to fabricate zirconia toughened alumina, and the infiltration systems consist of the four following systems Zr4+/La3+, Zr4+/Er3+, Zr4+/Gd3+, and Zr4+/Ce4+. The sample immersed with Zr4+/La3+ shows intense peaks of m-ZrO2 phase compared to the other samples while a new phase of flake-like LaAl11O18 occurs in the Zr4+/La3+ immersed sample, the existence of which could be confirmed by XRD and EDS. The fracture toughness of the Zr4+/Er3+, Zr4+/Gd3+, and Zr4+/Ce4+ samples remained basically unchanged versus the crack size, while the measured fracture toughness values for the Zr4+/La3+ system could be fitted as a rising R-curve behavior with the steady-state fracture toughness of 17.76 MPa·m1/2. The enormous enhancement of the toughness could be attributed to thermal expansion misfit and flake-like LaAl11O18 in the Zr4+/La3+ system. The effect of residual stresses on the fracture mode and thus the toughness is discussed on the basis of theoretical calculation and analysis. It is the first time a rising R-curve behavior is observed in the 3D printed ceramics. The shocking discovery provides a highly effective toughening way in 3D printing combined infiltration approach.

Precipitation in Al-Li-Zr alloys

1992 ◽  
Vol 50 (1) ◽  
pp. 186-187
Author(s):  
D.M. Vanderwalker
Keyword(s):  
Fracture Toughness ◽  
Precipitation Hardening ◽  
Weight Ratio ◽  
High Strength ◽  
Transmission Electron ◽  
Water Quench ◽  
Aluminum Lithium ◽  
Aluminum Lithium Alloys ◽  
Lithium Alloys ◽  
Zr Alloys

Aluminum-lithium alloys have a low density and high strength to weight ratio. They are being developed for the aerospace industry.The high strength of Al-Li can be attributed to precipitation hardening. Unfortunately when aged, Al-Li aquires a low ductility and fracture toughness. The precipitate in Al-Li is part of a sequence SSSS → Al3Li → AlLi A description of the phases may be found in reference 1 . This paper is primarily concerned with the Al3Li phase. The addition of Zr to Al-Li is being explored to find the optimum in properties. Zirconium improves fracture toughness and inhibits recrystallization. This study is a comparision between two Al-Li-Zr alloys differing in Zr concentration.Al-2.99Li-0.17Zr(alloy A) and Al-2.99Li-0.67Zr (alloy B) were solutionized for one hour at 500oc followed by a water quench. The specimens were then aged at 150°C for 16 or 40 hours. The foils were punched into 3mm discs. The specimens were electropolished with a 1/3 nitric acid 2/3 methanol solution. The transmission electron microscopy was conducted on the JEM 200CX microscope.

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