Mechanical properties and characterization of ZrO2-Al2O3 composites with high fracture strength.

This paper presents a comparison on the effects of blending chitin and/or starch with poly(lactic acid) (PLA). Three sets of composites (PLA–chitin, PLA–starch and PLA–chitin–starch) with 92%, 94%, 96% and 98% PLA by weight were prepared. The percentage weight (wt.%) amount of the chitin and starch incorporated ranges from 2% to 8%. The mechanical, dynamic mechanical, thermal and microstructural properties were analyzed. The results from the tensile strength, yield strength, Young's modulus, and impact showed that the PLA–chitin–starch blend has the best mechanical properties compared to PLA–chitin and PLA–starch blends. The dynamic mechanical analysis result shows a better damping property for PLA–chitin than PLA–chitin–starch and PLA–starch. On the other hand, the thermal property analysis from thermogravimetry analysis (TGA) shows no significant improvement in a specific order, but the glass transition temperature of the composite increased compared to that of neat PLA. However, the degradation process was found to start with PLA–chitin for all composites, which suggests an improvement in PLA degradation. Significantly, the morphological analysis revealed a uniform mix with an obvious blend network in the three composites. Interestingly, the network was more significant in the PLA–chitin–starch blend, which may be responsible for its significantly enhanced mechanical properties compared with PLA–chitin and PLA–starch samples.

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Dynamic Mechanical Properties and Characterization of Inorganic Particulate-filled Polymer Composites

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705710387254 ◽

2010 ◽

Vol 24 (2) ◽

pp. 207-220 ◽

Cited By ~ 4

Author(s):

J.Z. Liang

Keyword(s):

Mechanical Properties ◽

Polymer Composites ◽

Dynamic Mechanical Properties ◽

Filled Polymer ◽

Dynamic Mechanical ◽

Properties And Characterization

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Microstructure, thermal, and mechanical characterization of rapidly solidified high strength Fe84.3Cr4.3Mo4.6V2.2C4.6

Journal of Materials Research ◽

10.1557/jmr.2010.0158 ◽

2010 ◽

Vol 25 (6) ◽

pp. 1164-1171 ◽

Cited By ~ 7

Author(s):

A. Schlieter ◽

U. Kühn ◽

J. Eckert ◽

H-J. Seifert

Keyword(s):

Mechanical Properties ◽

High Speed ◽

High Speed Steel ◽

High Strength ◽

Cast State ◽

High Fracture ◽

Complex Carbides ◽

Rapidly Solidified ◽

Heating Up

Systematic microstructural and mechanical investigations of the Fe84.3Cr4.3Mo4.6V2.2C4.6 alloy cast under special manufacturing conditions in the as-cast state and after specific heat treatment are presented to point out that the special manufacturing of the alloy led to high compression strength (up to 4680 MPa) combined with large fracture strain (about 20%) already in the as-cast state. One select chemical composition of the alloy, which was mentioned previously [Kühn et al., Appl. Phys. Lett.90, 261901 (2007)] enhanced mechanical properties already in the as-cast state. Furthermore, that composition is comparable to commercial high-speed steel. By the special manufacturing used, a high purity of elements and a high cooling rate, which led to a microstructure similar to a composite-like material, composed of dendritic area (martensite, bainite, and ferrite) and interdendritic area (e.g., complex carbides). The presented article demonstrates an alloy that exhibits already in the as-cast state high fracture strength and large ductility. Furthermore, these outstanding mechanical properties remain unchanged after heating up to 873 K.

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Mechanical Properties and Characterization of the Crystalline Structure in Annealed Thermotropic Poly(azomethines)

Macromolecules ◽

10.1021/ma950940h ◽

1996 ◽

Vol 29 (7) ◽

pp. 2515-2523 ◽

Cited By ~ 18

Author(s):

P. Cerrada ◽

L. Oriol ◽

M. Piñol ◽

J. L. Serrano ◽

I. Iribarren ◽

...

Keyword(s):

Mechanical Properties ◽

Crystalline Structure ◽

Properties And Characterization

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Characterization of adobe bricks used in developing countries: Mexico as a case of study

Revista de Arquitectura y Diseño ◽

10.35429/jad.2021.13.5.1.12 ◽

2021 ◽

pp. 1-12

Author(s):

José Marcelino Gutiérrez-Villalobos ◽

Jatziri Yunuén Moreno-Martínez ◽

Policarpo Catalán-Quiroz ◽

Arturo Galván-Chávez

Keyword(s):

Mechanical Properties ◽

Rural Areas ◽

Building Material ◽

Nondestructive Tests ◽

Properties And Characterization ◽

Earth Blocks ◽

Adobe Masonry ◽

New Sensors ◽

High Degree

In Mexico adobe masonry is a traditional building material common in rural areas with low economic development and a high degree of marginalization. In addition, a growing interest in adobe masonry is noticed in two ways: for rescuing the heritage and as a rediscovered environmentally friendly building material. The problems are found of how to carry out the conservation works of the great built heritage with this material, as well as the lack of skilled people at all levels, from designer to masons, because it is a forgotten technique. Hence, some recent investigations about the obtention of adobe mechanical properties and characterization of adobe bricks, including earth blocks, have been performed. This article investigates experimentally destructive and nondestructive tests used for this purpose, especially elastic mechanical properties, considering new sensors, systems and different techniques has led to the inspection of adobe bricks. The results show, compared destructive with nondestructive methods, a good correlation between both techniques. This study contributes towards a better understanding of the elastic mechanical properties of adobe bricks built in Mexico, considered as a developing country.

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Processing and characterization of B4C-Al laminated cermets

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100178240 ◽

1990 ◽

Vol 48 (4) ◽

pp. 1022-1023

Author(s):

Mehrdad Yasrebi ◽

Gyeung H. Kim ◽

David L. Milius ◽

Mehmet Sarikaya ◽

Ilhan A. Aksay

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Fracture Strength ◽

Laminated Composites ◽

Laminated Composite ◽

Type A ◽

Type B ◽

Body Type ◽

Metal Infiltration

B4C-Al composites show enhanced fracture strength and fracture toughness values over monolithic B4C.1-2 A controlled change in structural morphologies such as lamination further enhances mechanical properties of the composite over the B4C-Al composites processed to form a monolithic morphology. This paper summarizes microstructure-property correlations studied in B4C-Al laminated composites.The laminated composite is formed either by metal infiltration of B4C tapes sandwiched with Al sheets, type (a), (Fig. 1a) or by lamination of B4C tapes of different porosity and then subjected to metal infiltration of the laminated body, type (b), (Fig. 1b). In the first method, after thin tapes of B4C were formed, each tape was individually sintered between polished graphite discs, then layered with Al sheets, and the entire stack was heated to induce infiltration. In the second method, tapes of B4C with different green densities were stacked and laminated under pressure and temperature. The laminated body was then sintered and subsequently infiltrated with Al.

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