scholarly journals Dataset on microstructural characteristics and mechanical performance of homogeneous and functionally graded fibrous scaffolds

Data in Brief ◽  
2019 ◽  
Vol 27 ◽  
pp. 104718
Author(s):  
Weily Khoo ◽  
She Man Chung ◽  
Shing Chee Lim ◽  
Cheng Yee Low ◽  
Jenna M. Shapiro ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Functionally Graded ◽  
Microstructural Characteristics ◽  
Fibrous Scaffolds

Flexural Behavior of Six Species of Italian Bamboo

2022 ◽  
Author(s):  
Silvia Greco ◽  
Luisa Molari
Keyword(s):  
Structural Material ◽  
Flexural Strength ◽  
Mechanical Performance ◽  
Functionally Graded ◽  
Flexural Behavior ◽  
Bending Test ◽  
Bamboo Species ◽  
Four Point Bending ◽  
Flexural Ductility ◽  
Graded Material

The good mechanical performance of bamboo, coupled with its sustainability, has boosted the idea to use it as a structural material. In some areas of the world it is regularly used in constructions but there are still countries in which there is a lack of knowledge of the mechanical properties of the locally-grown bamboo, which limits the spread of this material. Bamboo is optimized to resist to flexural actions with its peculiar micro structure along the thickness in which the amount of fibers intensifies towards the outer layer and the inner part is composed mostly of parenchyma. The flexural strength depends on the amount of fibers, whereas the flexural ductility is correlated to the parenchyma content. This study focuses on the flexural strength and ductility of six different species of untreated bamboo grown in Italy. A four-point bending test was carried out on bamboo strips in two different loading configurations relating to its microstructure. Deformation data are acquired from two strain gauges in the upper and lower part of the bamboo beam. Difference in shape and size of Italian bamboo species compared to the ones traditionally used results in added complexity when performing the tests. Such difficulties and the found solutions are also described in this work. The main goal is to reveal the flexural behavior of Italian bamboo as a functionally graded material and to expand the knowledge of European bamboo species toward its use as a structural material not only as culm but also as laminated material.

scholarly journals Compressive Properties of Additively Manufactured Functionally Graded Kagome Lattice Structure

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 517 ◽  
Author(s):  
Rinoj Gautam ◽  
Sridhar Idapalapati
Keyword(s):  
Energy Absorption ◽  
Fused Deposition Modeling ◽  
Mechanical Performance ◽  
Lattice Structure ◽  
Peak Load ◽  
Functionally Graded ◽  
Uniform Density ◽  
Compressive Properties ◽  
Fused Deposition ◽  
Number Of Layers

Cellular lattice structures have important applications in aerospace, automobile and defense industries due to their high specific strength, modulus and energy absorption. Additive manufacturing provides the design freedom to fabricate complex cellular structures. This study investigates the compressive properties and deformation behavior of a Ti-6Al-4V unit Kagome structure fabricated by selective laser melting. Further, the mechanical performance of multi-unit and multi-layer Kagome structure of acrylonitrile butadiene styrene (ABS) ABS-M30™ manufactured by fused deposition modeling is explored. The effect of a number of layers of Kagome structure on the compressive properties is investigated. This paper also explores the mechanical properties of functionally graded and uniform density Kagome structure. The stiffness of the structure decreased with the increase in the number of layers whereas no change in peak load was observed. The functionally graded Kagome structure provided 35% more energy absorption than the uniform density structure.

Application of Ceramics Metal Functionally Graded Materials on Green Automobiles

2007 ◽  
Vol 280-283 ◽  
pp. 1925-0 ◽  
Author(s):  
Yong Li ◽  
Song Jian ◽  
Zhi Min
Keyword(s):  
Functionally Graded Materials ◽  
Comparative Research ◽  
Mechanical Performance ◽  
Friction Pair ◽  
Functionally Graded ◽  
Graded Materials ◽  
Sealing Performance ◽  
Traditional Ceramics ◽  
External Characteristics ◽  
Made In

Ceramics metal functionally graded materials (FGM) is applied on the dual friction pair of the green automobiles. The structure and component characteristics of FGM are better, compared with traditional Ceramics. Even with the same components, FGM bears an outstanding mechanical performance and its cracking strength, toughness and fatigue strength are relatively superior. The influence of Ceramics metal functionally graded materials on the performance of automobiles are analyzed via a comparative research and comparison of the external characteristics of automobile is made in terms of mechanism. The results indicate that the power output, fuel consumption and durability are improved considerably on the green automobiles. Improvement is also made on the wearing capability, lubricity and sealing performance as well. Hence comes the reduction of friction loss and leakage loss. The principal abrasion mechanism of FGM is plastic flowing and the secondary are brittle failure and grain abrasion.

Indentation Responses of Functionally-Graded Al2TiO5- Based Ceramics

2011 ◽  
Vol 239-242 ◽  
pp. 171-174
Author(s):  
Z Oo ◽  
I.M Low
Keyword(s):  
Fracture Resistance ◽  
Mechanical Performance ◽  
Functionally Graded ◽  
Resistant Material ◽  
High Melting Point ◽  
Aluminium Titanate ◽  
Low Thermal Expansion ◽  
Die Pressing ◽  
Graded Layers ◽  
Tailored Design

Aluminium titanate, Al2TiO5 (AT) with the pseudobrookite structure is the only compound in the alumina-titania system. It is an excellent refractory and thermal shock resistant material due to its relatively low thermal expansion coefficient (1 ´10-6 °C –1) and high melting point (1860°C). However, its low mechanical strength, hardness and fracture resistance together with susceptibility to decomposition in the temperature range 900–1200°C has limited its wider application. In this paper, the innovative tailored design of functionally- graded Al2TiO5 – based ceramics system was presented. This involves the use of a vacuum heat-treatment or die-pressing to form hard graded layers of alumina on Al2TiO5. These hard outer layers will provide hardness and wear resistance to protect the softer but damage resistant underlayers. The results will also explore unresolved issues concerning the effect of graded interfaces on their physical and mechanical performance properties.

Multimaterial printing and characterization for mechanical and surface properties of functionally graded prototype

2019 ◽  
Vol 233 (19-20) ◽  
pp. 6741-6753 ◽  
Author(s):  
Sudhir Kumar ◽  
Rupinder Singh ◽  
TP Singh ◽  
Ajay Batish
Keyword(s):  
Polylactic Acid ◽  
Surface Properties ◽  
Fused Deposition Modeling ◽  
Mechanical Performance ◽  
Three Dimensional ◽  
Surface Hardness ◽  
Functionally Graded ◽  
Three Dimensional Printing ◽  
Fused Deposition ◽  
Dimensional Printing

In this work, an effort has been made for multimaterial three-dimensional printing of functionally graded prototypes of polylactic acid matrix (tensile specimens as per ASTM D638 type IV) followed by characterization of mechanical and surface properties. The work is an extension of previous reported studies on twin-screw extrusion process for the preparation of multimaterial wires as feedstock filaments in possible three-dimensional printing applications. The results of the study suggest that the highest peak strength (46.28 MPa) and break strength (41.65 MPa) was obtained for multimaterial three-dimensional printed samples at infill density 100%, infill angle 45°, and infill speed of 90 mm/s on commercial open source fused deposition modeling setup. Further surface hardness measurements performed on two extreme surfaces (top surface comprising magnetite (Fe3O4)-reinforced polylactic acid and bottom with polylactic acid without any reinforcement) revealed that the hardness for the bottom layer was more than the hardness for the top layer. From fractured surface analysis (using photomicrographs), it has been observed that the three-dimensional printed samples with low infill density resulted into more void formation due to which the performance while mechanical testing was poor in comparison to samples printed with higher infill density. The results are also supported by rendered images of photomicrographs, which revealed that high roughness value of samples printed with low infill density was also one of the reasons for poor mechanical performance of multimaterial three-dimensional printed functionally graded prototypes.

scholarly journals Coupling Analysis of Flexoelectric Effect on Functionally Graded Piezoelectric Cantilever Nanobeams

Micromachines ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 595
Author(s):  
Yuhang Chen ◽  
Maomao Zhang ◽  
Yaxuan Su ◽  
Zhidong Zhou
Keyword(s):  
Boundary Conditions ◽  
Electric Potential ◽  
Large Scale ◽  
Mechanical Performance ◽  
Functionally Graded ◽  
Generalized Variational Principle ◽  
Beam Model ◽  
Gradient Distribution ◽  
Mechanical Coupling ◽  
Flexoelectric Effect

The flexoelectric effect has a significant influence on the electro-mechanical coupling of micro-nano devices. This paper studies the mechanical and electrical properties of functionally graded flexo-piezoelectric beams under different electrical boundary conditions. The generalized variational principle and Euler–Bernoulli beam theory are employed to deduce the governing equations and corresponding electro-mechanical boundary conditions of the beam model. The deflection and induced electric potential are given as analytical expressions for the functionally graded cantilever beam. The numerical results show that the flexoelectric effect, piezoelectric effect, and gradient distribution have considerable influences on the electro-mechanical performance of the functionally graded beams. Moreover, the nonuniform piezoelectricity and polarization direction will play a leading role in the induced electric potential at a large scale. The flexoelectric effect will dominate the induced electric potential as the beam thickness decreases. This work provides helpful guidance to resolve the application of flexoelectric and piezoelectric effects in functionally graded materials, especially on micro-nano devices.

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